US3905031A — Data processor for a doppler radar mapping system…

Claim 1

Independent Claim 187 words

A mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects to be mapped; recording means coupled to said radar means for storing said Doppler signals; reading means coupled to said recording means to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said reading means and to said reference means for devleoping a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled to said mixer means to pass said difference frequency signal at selected frequencies; detector means coupled to each of said narrow-band filters for developing a display signal in response to the passage therethrough of said selected frequencies of said difference frequency signal; commutator means coupled to the outputs of said detector means and including means operatively responsive to said reading means to sample said outputs in a predetermined order; and map forming means coupled to said commutator means for receiving in said order said display signals to develop an indication of the object to be mapped.

Claim 2

Dependent Claim 187 words

A mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects to be mapped; recording means coupled to said radar means for storing said Doppler signals; reading means coupled to said recording means to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said reading means and to said reference means for devleoping a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled to said mixer means to pass said difference frequency signal at selected frequencies; detector means coupled to each of said narrow-band filters for developing a display signal in response to the passage therethrough of said selected frequencies of said difference frequency signal; commutator means coupled to the outputs of said detector means and including means operatively responsive to said reading means to sample said outputs in a predetermined order; and map forming means coupled to said commutator means for receiving in said order said display signals to develop an indication of the object to be mapped.

Claim 3

Dependent Claim 221 words

A radar mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of the positions of objects to be mapped; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said readout means and to said reference means for developing a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled in parallel circuit relationship to said mixer means, each filter being adapted to pass a predetermined portion of said difference frequency signals at preselected spaced apart center frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to the passage of said predetermined portions, said display sigNals being indicative of the position of the objects to be mapped; commutator means coupled to said signal forming means and including driving means for sequentially connecting said commutator means to said detector means to provide a conductive path for said display signals; and display means including a cathode ray tube coupled to said commutator means and to said readout means for developing an indication of the objects to be mapped.

Claim 4

Dependent Claim 221 words

A radar mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of the positions of objects to be mapped; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said readout means and to said reference means for developing a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled in parallel circuit relationship to said mixer means, each filter being adapted to pass a predetermined portion of said difference frequency signals at preselected spaced apart center frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to the passage of said predetermined portions, said display sigNals being indicative of the position of the objects to be mapped; commutator means coupled to said signal forming means and including driving means for sequentially connecting said commutator means to said detector means to provide a conductive path for said display signals; and display means including a cathode ray tube coupled to said commutator means and to said readout means for developing an indication of the objects to be mapped.

Claim 5

Dependent Claim 161 words

A radar mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of positions of an object to be mapped; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said readout means and to said reference means for developing a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled to said mixer means for receiving said difference frequency signal; detector means each coupled to one of said filters; switching means coupled to said detector means for sampling the outputs thereof in a predetermined order; and display means including a cathode ray tube coupled to said switching means and to said readout means for developing an indication of the object to be mapped.

Claim 6

Dependent Claim 161 words

A radar mapping system comprising, in combination, coherent radar means for developing Doppler signals representative of positions of an object to be mapped; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop information signals; reference means including an oscillator for producing a frequency varying signal; mixer means coupled to said readout means and to said reference means for developing a difference frequency signal from said information and said frequency varying signals; filter means including a plurality of narrow-band filters coupled to said mixer means for receiving said difference frequency signal; detector means each coupled to one of said filters; switching means coupled to said detector means for sampling the outputs thereof in a predetermined order; and display means including a cathode ray tube coupled to said switching means and to said readout means for developing an indication of the object to be mapped.

Claim 7

Dependent Claim 255 words

In a mapping system wherein provided are radar means for developing Doppler signals having frequency varying characteristics and time of occurrence characteristics representative of the position of objects within an area to be mapped and recording means coupled to said radar means for storing said Doppler signals, a multibeam synthetic array data processor for said mapping system comprising, in combination, reading means coupled to said recording means for scanning said stored doppler signals, control means coupled to said reading means for controlling said reading means to read said stored Doppler signals in a predetermined order to develop information signals; mixer means coupled to said recording means; swept oscillator means coupled between said reading means and said mixer means for developing a frequency varying reference signal, said mixer means developing a difference frequency signal; filter means including a plurality of narrowband filters coupled to said mixer means to pass predetermined spaced apart frequency bands of said difference frequency; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency signal falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means and means for intensity modulating said electron beam; and commutating means coupled between said output means and said detector means for sequentially transmitting said display signals to said output means for developing an indication of the objects within said area to be mapped.

Claim 8

Dependent Claim 255 words

In a mapping system wherein provided are radar means for developing Doppler signals having frequency varying characteristics and time of occurrence characteristics representative of the position of objects within an area to be mapped and recording means coupled to said radar means for storing said Doppler signals, a multibeam synthetic array data processor for said mapping system comprising, in combination, reading means coupled to said recording means for scanning said stored doppler signals, control means coupled to said reading means for controlling said reading means to read said stored Doppler signals in a predetermined order to develop information signals; mixer means coupled to said recording means; swept oscillator means coupled between said reading means and said mixer means for developing a frequency varying reference signal, said mixer means developing a difference frequency signal; filter means including a plurality of narrowband filters coupled to said mixer means to pass predetermined spaced apart frequency bands of said difference frequency; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency signal falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means and means for intensity modulating said electron beam; and commutating means coupled between said output means and said detector means for sequentially transmitting said display signals to said output means for developing an indication of the objects within said area to be mapped.

Claim 9

Dependent Claim 240 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals, multibeam synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency; mixer means coupled to said readout means and to said oscillator means for mixing said Doppler history signals and said reference frequency signal to develop a difference frequency signal; filter means including a plurality of narrow-band filters arranged in Parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the objects within the area to be mapped.

Claim 10

Dependent Claim 240 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals, multibeam synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency; mixer means coupled to said readout means and to said oscillator means for mixing said Doppler history signals and said reference frequency signal to develop a difference frequency signal; filter means including a plurality of narrow-band filters arranged in Parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the objects within the area to be mapped.

Claim 11

Dependent Claim 273 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals, a multibeam synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency, said oscillator means including means responsive to said readout means for varying the rate of change of said varying frequency as a function of the range being scanned by said readout means; mixer means coupled to said readout means and to said oscillator means for mixing said Doppler history signals and said reference frequency signal to develop a difference frequency signal; filter means including a plurality of narrow-band filters arranged in parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the object within the area to be mapped.

Claim 12

Dependent Claim 273 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals, a multibeam synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency, said oscillator means including means responsive to said readout means for varying the rate of change of said varying frequency as a function of the range being scanned by said readout means; mixer means coupled to said readout means and to said oscillator means for mixing said Doppler history signals and said reference frequency signal to develop a difference frequency signal; filter means including a plurality of narrow-band filters arranged in parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the object within the area to be mapped.

Claim 13

Dependent Claim 238 words

A radar mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects within said range interval; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency; mixer means coupled to said readout means and to said oscillator means for developing a difference signal from said Doppler history signal and said reference signal; filter means including a plurality of narrow band-pass filters parallelly coupled to said mixer means, each of said filters being operative to pass predetermined spaced apart portion of the frequency spectrum of said difference signal; detector means coupled to each of said filters and adapted to provide mapping signals when corresponding portions of said difference signals pass through said filter means; commutator means coupled to said detector means and including means for sampling same as said readout means scans the stored Doppler signals; and output means coupled to said commutator means and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said sampling means; and means for modulating said electron beam with said mapping signals to develop a high resolution map of said range interval.

Claim 14

Dependent Claim 238 words

A radar mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects within said range interval; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency; mixer means coupled to said readout means and to said oscillator means for developing a difference signal from said Doppler history signal and said reference signal; filter means including a plurality of narrow band-pass filters parallelly coupled to said mixer means, each of said filters being operative to pass predetermined spaced apart portion of the frequency spectrum of said difference signal; detector means coupled to each of said filters and adapted to provide mapping signals when corresponding portions of said difference signals pass through said filter means; commutator means coupled to said detector means and including means for sampling same as said readout means scans the stored Doppler signals; and output means coupled to said commutator means and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said sampling means; and means for modulating said electron beam with said mapping signals to develop a high resolution map of said range interval.

Claim 15

Dependent Claim 331 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals, said readout means including a read cathode ray tube; means for deflecting the electron beam of said read cathode ray tube at a first rate in an azimuth direction and concomitantly at a second rate in the range dimension to form a reading frame; mixer means coupled to said readout means; variable gain means responsive to said deflecting means for developing a control signal comprising a ramp voltage the slope of which is different for each successive azimuth deflection of said read electron beam during each reading frame; oscillator means coupled to said mixer means and to said variable gain means for generating a reference signal of varying frequency in response to said ramp voltage, said mixer means developing a difference frequency signal representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters arranged in parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the objects within the area to be mapped.

Claim 16

Dependent Claim 331 words

In a radar mapping system of the type operable from a moving craft to form a high resolution display of an area to be mapped and including radar means for developing Doppler signals from objects present within said area and recording means for storing said Doppler signals synthetic array data processor comprising, in combination, readout means for scanning said stored Doppler signals to develop Doppler history signals, said readout means including a read cathode ray tube; means for deflecting the electron beam of said read cathode ray tube at a first rate in an azimuth direction and concomitantly at a second rate in the range dimension to form a reading frame; mixer means coupled to said readout means; variable gain means responsive to said deflecting means for developing a control signal comprising a ramp voltage the slope of which is different for each successive azimuth deflection of said read electron beam during each reading frame; oscillator means coupled to said mixer means and to said variable gain means for generating a reference signal of varying frequency in response to said ramp voltage, said mixer means developing a difference frequency signal representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters arranged in parallel circuit relationship and coupled to said mixer means, each of said filters having predetermined spaced apart pass-bands; detector means coupled to each of said narrow-band filters for developing display signals in response to the transmission therethrough of those components of said difference frequency signal falling within said pass-bands; commutating means including an output terminal coupled to said detector means for providing a conductive path between same and said output terminal; and display means coupled to said output terminal and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said readout means, and means for modulating said electron beam with said display signals to develop a two-dimensional indication of the objects within the area to be mapped.

Claim 17

Dependent Claim 270 words

A radar mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects within said range interval; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency, said oscillator means including means responsive to said readout means for varying the rate of change of said varying frequency as a function of the range being scanned by said readout means; mixer means coupled to said readout means and to said oscillator means for developing a difference signal from said Doppler history signal and said reference signal; filter means including a plurality of narrow band-pass filters parallelly coupled to said mixer means, each of said filters being operative to pass predetermined spaced apart portions of the frequency spectrum of said difference signal; detector means coupled to each of said filters and adapted to provide mapping singals when corresponding portions of said difference signals pass through said filter means; commutator means coupled to said detector means and including means for sampling same as said readout means scans the stored Doppler signals; and output means coupled to said commutator means and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said sampling means; and means for modulating said electron beam with said mapping signals to develop a High resolution map of said range interval.

Claim 18

Dependent Claim 270 words

A radar mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing Doppler signals representative of the position of objects within said range interval; recording means coupled to said radar means for storing said Doppler signals; readout means coupled to said recording means for scanning the stored Doppler signals to develop Doppler history signals; oscillator means for generating a reference signal of varying frequency, said oscillator means including means responsive to said readout means for varying the rate of change of said varying frequency as a function of the range being scanned by said readout means; mixer means coupled to said readout means and to said oscillator means for developing a difference signal from said Doppler history signal and said reference signal; filter means including a plurality of narrow band-pass filters parallelly coupled to said mixer means, each of said filters being operative to pass predetermined spaced apart portions of the frequency spectrum of said difference signal; detector means coupled to each of said filters and adapted to provide mapping singals when corresponding portions of said difference signals pass through said filter means; commutator means coupled to said detector means and including means for sampling same as said readout means scans the stored Doppler signals; and output means coupled to said commutator means and including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said sampling means; and means for modulating said electron beam with said mapping signals to develop a High resolution map of said range interval.

Claim 19

Dependent Claim 383 words

A focused mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing a plurality of frequency varying Doppler signals having frequency and time characteristics representative of the position of the moving craft; means for recording said Doppler signals received over said range interval in the form of parallel line traces along the range dimension, the information from each range forming separable range elements; reading means coupled to said recording means for sequentially scanning successive range elements to develop Doppler history signals; control means coupled to said reading means for developing a first sweep signal having a duration so said reading means scans a portion of said traces in a direction substantially orthogonal thereto to form a range element and for developing a second sweep signal so said reading means sequentially scans successive range element for developing informational signals having frequency components proportional to the recorded Doppler signals; mixing means coupled to said reading means; swept oscillator means coupled to said mixing means; variable gain means coupled to said swept oscillator means and to said control means, said variable gain means being responsive to said first and second sweep signals to continually develop a reference frequency function having a predetermined rate of change of frequency during each of said first sweep signals to conform to the rate of change of frequency of said informational signals to provide focusing, said mixing means developing a difference frequency representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters coupled to said mixing means for passing predetermined spaced apart frequency bands of said difference frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means, and means for intensity modulating said electron beam; and switching means coupled between said output means and said detector means for commutating display signals to the intensity modulating means of said output means to develop a two-dimensional indication of the objects within said area being mapped.

Claim 20

Dependent Claim 383 words

A focused mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing a plurality of frequency varying Doppler signals having frequency and time characteristics representative of the position of the moving craft; means for recording said Doppler signals received over said range interval in the form of parallel line traces along the range dimension, the information from each range forming separable range elements; reading means coupled to said recording means for sequentially scanning successive range elements to develop Doppler history signals; control means coupled to said reading means for developing a first sweep signal having a duration so said reading means scans a portion of said traces in a direction substantially orthogonal thereto to form a range element and for developing a second sweep signal so said reading means sequentially scans successive range element for developing informational signals having frequency components proportional to the recorded Doppler signals; mixing means coupled to said reading means; swept oscillator means coupled to said mixing means; variable gain means coupled to said swept oscillator means and to said control means, said variable gain means being responsive to said first and second sweep signals to continually develop a reference frequency function having a predetermined rate of change of frequency during each of said first sweep signals to conform to the rate of change of frequency of said informational signals to provide focusing, said mixing means developing a difference frequency representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters coupled to said mixing means for passing predetermined spaced apart frequency bands of said difference frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means, and means for intensity modulating said electron beam; and switching means coupled between said output means and said detector means for commutating display signals to the intensity modulating means of said output means to develop a two-dimensional indication of the objects within said area being mapped.

Claim 21

Independent Claim 290 words

A system for sequentially processing stored Doppler information signals having a frequency variation indicative of the position of objects in a first dimension and a time of occurrence indicative of the position of objects in a second dimension, said Doppler information being stored on a storage means in said first and second dimensions comprising reading means coupled to said storage means; means coupled to said reading means for controlling said reading means to read a portion of said stored Doppler information in said first dimension sequentially over a predetermined number of elements in said second dimension to develop in sequence a plurality of signals at frequencies representative of the stored Doppler information of each of said elements; mixing means coupled to said reading means; oscillator means coupled to said mixing means and to said controlling means for developing a repeditive reference signal of varying frequencies in synchronism with the reading of said stored information in said first dimension, said mixing means developing signals having a frequency equal to the frequency difference between said signals developed by said reading means and said reference signal; filter means coupled to said mixing means and including a plurality of narrow-band pass filters each having a pass-band centered at predetermined spaced apart frequencies; detecting means coupled to each of said narrow-band pass filters for developing an envelope signal from the signals being passed therethrough; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means and means for intensity modulating said electron beam; and switch means coupled intermediate said detecting means and said output means for connecting said envelope signals in sequence to said intensity modulating means to develop a two-dimensional indication of said information signals.

Claim 22

Independent Claim 290 words

A system for sequentially processing stored Doppler information signals having a frequency variation indicative of the position of objects in a first dimension and a time of occurrence indicative of the position of objects in a second dimension, said Doppler information being stored on a storage means in said first and second dimensions comprising reading means coupled to said storage means; means coupled to said reading means for controlling said reading means to read a portion of said stored Doppler information in said first dimension sequentially over a predetermined number of elements in said second dimension to develop in sequence a plurality of signals at frequencies representative of the stored Doppler information of each of said elements; mixing means coupled to said reading means; oscillator means coupled to said mixing means and to said controlling means for developing a repeditive reference signal of varying frequencies in synchronism with the reading of said stored information in said first dimension, said mixing means developing signals having a frequency equal to the frequency difference between said signals developed by said reading means and said reference signal; filter means coupled to said mixing means and including a plurality of narrow-band pass filters each having a pass-band centered at predetermined spaced apart frequencies; detecting means coupled to each of said narrow-band pass filters for developing an envelope signal from the signals being passed therethrough; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means and means for intensity modulating said electron beam; and switch means coupled intermediate said detecting means and said output means for connecting said envelope signals in sequence to said intensity modulating means to develop a two-dimensional indication of said information signals.

Claim 23

Dependent Claim 391 words

A focused mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing a plurality of frequency varying Doppler signals having frequency and time characteristics representative of the position of the moving craft; means for recording said Doppler signals received over said range interval in the form of parallel line traces along the range dimension, the information from each range forming separable range elements; reading means coupled to said recording means for sequentially scanning successive range elements to develop Doppler history signals; control means coupled to said reading means for developing a first sweep signal having a duration so said reading means scans a portion of said traces in a direction substantially orthogonal thereto to form a range element and for developing a second sweep signal so said reading means sequentially scans successive range element for developing informational signals having frequency components proportional to the recorded Doppler signals; mixing means coupled to said reading means; swept oscillator means coupled to said mixing means; variable gain means coupled to said swept oscillator means and to said control means, said variable gain means being responsive to said first and second sweep signals to develop a reference frequency function having a predetermined rate of change of frequency during each of said first sweep signals, said predetermined rate during any one of said first sweep signals being different from the preceding and succeeding sweep signals to provide all range focusing, said mixing means developing a difference frequency representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters coupled to said mixing means for passing predetermined spaced apart frequency bands of said difference frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means, and means for intensity modulating said electron beam; and switching means coupled between said output means and said detector means for commutating display signals to the intensity modulating means of said output means to develop a two-dimensional indication of the objects within said area being mapped.

Claim 24

Dependent Claim 391 words

A focused mapping system operable to map a range interval from a craft moving in azimuth relative to objects being mapped comprising, in combination, coherent radar means for developing a plurality of frequency varying Doppler signals having frequency and time characteristics representative of the position of the moving craft; means for recording said Doppler signals received over said range interval in the form of parallel line traces along the range dimension, the information from each range forming separable range elements; reading means coupled to said recording means for sequentially scanning successive range elements to develop Doppler history signals; control means coupled to said reading means for developing a first sweep signal having a duration so said reading means scans a portion of said traces in a direction substantially orthogonal thereto to form a range element and for developing a second sweep signal so said reading means sequentially scans successive range element for developing informational signals having frequency components proportional to the recorded Doppler signals; mixing means coupled to said reading means; swept oscillator means coupled to said mixing means; variable gain means coupled to said swept oscillator means and to said control means, said variable gain means being responsive to said first and second sweep signals to develop a reference frequency function having a predetermined rate of change of frequency during each of said first sweep signals, said predetermined rate during any one of said first sweep signals being different from the preceding and succeeding sweep signals to provide all range focusing, said mixing means developing a difference frequency representative of the azimuth position of said objects; filter means including a plurality of narrow-band filters coupled to said mixing means for passing predetermined spaced apart frequency bands of said difference frequencies; detector means coupled to each of said narrow-band filters for developing display signals in response to components of said difference frequency falling within said spaced apart frequency bands being passed through said filter means; output means including a cathode ray tube, means for deflecting the electron beam thereof in synchronism with said reading means, and means for intensity modulating said electron beam; and switching means coupled between said output means and said detector means for commutating display signals to the intensity modulating means of said output means to develop a two-dimensional indication of the objects within said area being mapped.

Claim 25

Dependent Claim 427 words

A synthetic array radar system for providing focused mapping of objects in a range interval opposite a moving craft in response to Doppler signals stored in successive range traces across a movable strip film in the form of film density variations, the frequency and time occurrence characteristics of which represent the range and azimuth positions of objects located within said range interval, comprising a read scanning cathode ray tube disposed adjacent to said strip film for developing a movable light spot with the electron beam thereof; means including first and second sweep generators for deflecting said electron beam in the azimuth and range dimensions at first and second sweep rates, respectively, said second sweep rate being substantially slower than said first sweep rate; means for imaging said light spot onto said strip film, said light spot being swept Continuously across successive range elements in response to said first sweep generator, each of said range elements defining a synthetic array length comprising a predetermined number of said range traces, said light spot also being swept across successive reading frames in response to said second sweep, each of said reading frames comprising a predetermined number of said range elements; photosensing means disposed adjacent to said strip film for developing Doppler history signals during each range element having frequencies proportional to the stored Doppler signals; a mixer coupled to said photosensing means; a swept oscillator coupled to said mixer; variable gain means coupled between said deflecting means and said swept oscillator and responsive to said first and second generators to control said swept oscillator to develop a reference frequency signal that varies over a predetermined frequency range for each range element at a rate substantially the same as that of said Doppler history signals, said mixer developing a difference signal between said Doppler history signals and said reference frequency signal; a plurality of narrow-band filters parallelly coupled to said mixer, each of said filters having a pass-band centered at predetermined spaced apart frequencies; an envelope detector coupled to each of said filters for developing display signals in response to the appropriate component of said difference signal being passed through the respective filter; display means including a cathode ray tube, means for deflecting the electron beam thereof at said first sweep rate, and means for intensity modulating said last-mentioned electron beam; and commutating means coupled between said display means and each of said detectors for sampling the outputs thereof during the time said read electron beam scans the following range element for developing a two-dimension indication of the objects being mapped.

Claim 26

Dependent Claim 427 words

A synthetic array radar system for providing focused mapping of objects in a range interval opposite a moving craft in response to Doppler signals stored in successive range traces across a movable strip film in the form of film density variations, the frequency and time occurrence characteristics of which represent the range and azimuth positions of objects located within said range interval, comprising a read scanning cathode ray tube disposed adjacent to said strip film for developing a movable light spot with the electron beam thereof; means including first and second sweep generators for deflecting said electron beam in the azimuth and range dimensions at first and second sweep rates, respectively, said second sweep rate being substantially slower than said first sweep rate; means for imaging said light spot onto said strip film, said light spot being swept Continuously across successive range elements in response to said first sweep generator, each of said range elements defining a synthetic array length comprising a predetermined number of said range traces, said light spot also being swept across successive reading frames in response to said second sweep, each of said reading frames comprising a predetermined number of said range elements; photosensing means disposed adjacent to said strip film for developing Doppler history signals during each range element having frequencies proportional to the stored Doppler signals; a mixer coupled to said photosensing means; a swept oscillator coupled to said mixer; variable gain means coupled between said deflecting means and said swept oscillator and responsive to said first and second generators to control said swept oscillator to develop a reference frequency signal that varies over a predetermined frequency range for each range element at a rate substantially the same as that of said Doppler history signals, said mixer developing a difference signal between said Doppler history signals and said reference frequency signal; a plurality of narrow-band filters parallelly coupled to said mixer, each of said filters having a pass-band centered at predetermined spaced apart frequencies; an envelope detector coupled to each of said filters for developing display signals in response to the appropriate component of said difference signal being passed through the respective filter; display means including a cathode ray tube, means for deflecting the electron beam thereof at said first sweep rate, and means for intensity modulating said last-mentioned electron beam; and commutating means coupled between said display means and each of said detectors for sampling the outputs thereof during the time said read electron beam scans the following range element for developing a two-dimension indication of the objects being mapped.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-09-08	1979-03-10	1979-09-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-09-08	1983-03-10	1983-09-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-09-08	1987-03-10	1987-09-09	$7700.00	Window Closed / Lapsed

Data processor for a doppler radar mapping system using a synthesized antenna array

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