US4359736A — Frequency-phase coding device

Claim 1

Independent Claim 128 words

A doppler tolerant pulse-compression-code generator for generating approximately orthogonal codes comprising: means for generating a signal pulse of bandwidth B; delay means with n signal taps spaced by equal delays τ for delaying the pulse generated by said pulse generating means by a series of equal delay increments; n bandpass filter channels approximately covering said bandwidth B such that each bandpass filter passes a different set of spectral lines; means for connecting each one of said n signal taps to a different one of said n bandpass filter channels; a phase coding circuit in each bandpass filter channel for phasing coding the signal passed by its respective bandpass filter channel; and means for adding the phase-coded signals from said n bandpass filter channels to form an orthogonal pulse.

Claim 2

Dependent Claim 128 words

A doppler tolerant pulse-compression-code generator for generating approximately orthogonal codes comprising: means for generating a signal pulse of bandwidth B; delay means with n signal taps spaced by equal delays τ for delaying the pulse generated by said pulse generating means by a series of equal delay increments; n bandpass filter channels approximately covering said bandwidth B such that each bandpass filter passes a different set of spectral lines; means for connecting each one of said n signal taps to a different one of said n bandpass filter channels; a phase coding circuit in each bandpass filter channel for phasing coding the signal passed by its respective bandpass filter channel; and means for adding the phase-coded signals from said n bandpass filter channels to form an orthogonal pulse.

Claim 3

Dependent Claim 21 words

A doppler-tolerant pulse-compression-code generator as defined in claim 1, wherein said pulse generating means comprises means for generating a video pulse.

Claim 4

Dependent Claim 32 words

A doppler-tolerant pulse-compression-code generator as defined in claim 1, further including a phase code control means for changing the phase shifts applied by said phase coding circuits in their respective filter channels.

Claim 5

Dependent Claim 38 words

A doppler-tolerant pulse-compression-code generator as defined in claim 3, wherein said phase code control means comprises a switching means for providing control voltage signals to each of said phase coding circuits to determine the phase code applied thereby.

Claim 6

Dependent Claim 20 words

A doppler-tolerant pulse-compression code generator as defined in claim 1, wherein each of said phase coding circuits comprises a multiplier.

Claim 7

Dependent Claim 35 words

A doppler-tolerant pulse-compression-code generator as defined in claims 1 or 3, wherein said connecting means comprises switching matrix for changing the order of the connections of the n bandpass filters to said n signal taps.

Claim 8

Dependent Claim 63 words

A doppler-tolerant pulse-compression code generator as defined in claim 6, wherein said switching matrix comprises n-position switch circuits, one n-position switch for each of said n signal taps, with each switch position connected to a different bandpass filter channel, for switching the signal on its respective signal tap to a bandpass filter channel different from the remaining signal taps from said delay means.

Claim 9

Independent Claim 93 words

A method for generating approximately orthogonal doppler-tolerant pulse-compression codes which suppress jamming comprising the steps of: generating a signal pulse of bandwidth B; delaying said signal pulse by a series of n-1 equal delays τ and taking a signal before each delay and after the last delay to yield n signals; filtering each of said n sequentially delayed signals by a different bandpass filter in a comb filter approximately covering said bandwidth B; phase coding each of said n filtered signals; and adding the n phase-coded signals to form an orthogonal signal pulse.

Claim 10

Independent Claim 93 words

A method for generating approximately orthogonal doppler-tolerant pulse-compression codes which suppress jamming comprising the steps of: generating a signal pulse of bandwidth B; delaying said signal pulse by a series of n-1 equal delays τ and taking a signal before each delay and after the last delay to yield n signals; filtering each of said n sequentially delayed signals by a different bandpass filter in a comb filter approximately covering said bandwidth B; phase coding each of said n filtered signals; and adding the n phase-coded signals to form an orthogonal signal pulse.

Claim 11

Dependent Claim 38 words

A method as defined in claim 8, further comprising the step of changing the order of the filtering of the n sequentially delayed signals in said filtering step in order to generate a variety of pulse compression codes.

Claim 12

Dependent Claim 43 words

A method as defined in claim 9, further comprising the step of changing the phase shifts applied to each of said n filtered signals in said phase coding step in a controlled manner in order to generate a variety of pulse compression codes.

Claim 13

Dependent Claim 107 words

A doppler tolerant pulse-compression-code generator for generating approximately orthogonal codes comprising: means for generating a signal pulse of bandwidth B; delays means with n signal taps spaced by equal delays τ for delaying the pulse generated by said pulse generating means by a series of equal delay increments; n bandpass filter channels approximately covering said bandwidth B by means of n adjacent spectral bands; a switching matrix for connecting, in any desired order, each one of said n signal taps to a different one of said n bandpass filter channels, and means for adding the delayed signals from said n bandpass channels to form an expanded pulse.

Claim 14

Dependent Claim 107 words

A doppler tolerant pulse-compression-code generator for generating approximately orthogonal codes comprising: means for generating a signal pulse of bandwidth B; delays means with n signal taps spaced by equal delays τ for delaying the pulse generated by said pulse generating means by a series of equal delay increments; n bandpass filter channels approximately covering said bandwidth B by means of n adjacent spectral bands; a switching matrix for connecting, in any desired order, each one of said n signal taps to a different one of said n bandpass filter channels, and means for adding the delayed signals from said n bandpass channels to form an expanded pulse.

Claim 15

Dependent Claim 66 words

A doppler-tolerant pulse-compression code generator as defined in claim 11, wherein said switching matrix comprises a plurality of n-position switch circuits, one n-position switch circuit for each of said n signal taps, with each switch position connected to a different bandpass filter channel, for switching the signal on its respective tap to a bandpass filter channel different from the remaining signal taps from said delay means.

Claim 16

Dependent Claim 72 words

A doppler-tolerant pulse compression code generator as defined in claim 11, wherein each successive filter channel from 1 to n is tuned to a frequency higher than the immediately preceding filter channel by a set frequency differential; and wherein said switching matrix includes means for connecting said n filter channels to said n signal taps in the order 1, 3, 2, 5, 4, 7, 6, . . . i. . . n.

Claim 17

Dependent Claim 74 words

A doppler-tolerant pulse compression code generator as defined in claim 11, wherein each successive filter channel from 1 to n is tuned to a frequency higher than the immediately preceding filter channel by a set frequency differential; and wherein said switching matrix includes means for connecting said n filter channels to said n signal taps in the order 2, 1, 4, 3, 6, 5, 8, 7, . . . i . . . n.

Claim 18

Independent Claim 141 words

A method for generating approximately orthogonal doppler-tolerant pulse-compression codes which suppress jamming comprising the steps of: generating a signal pulse of bandwidth B; delaying said signal pulse by a series of n-1 equal delays τ and taking a signal before each delay and after the last delay to yield n signals; switching each of said n sequentially delayed signals to a different bandpass filter in a comb filter in a first switching order; filtering each of said n sequentially delayed signals in the bandpass filter to which it was switched; adding the n delayed, filtered signals to form a first expanded signal pulse; and then switching each of said sequentially delayed signals to a different bandpass filter in the comb filter in a second switching order to yield a second expanded signal pulse approximately orthogonal to said first expanded signal pulse.

Claim 19

Independent Claim 141 words

A method for generating approximately orthogonal doppler-tolerant pulse-compression codes which suppress jamming comprising the steps of: generating a signal pulse of bandwidth B; delaying said signal pulse by a series of n-1 equal delays τ and taking a signal before each delay and after the last delay to yield n signals; switching each of said n sequentially delayed signals to a different bandpass filter in a comb filter in a first switching order; filtering each of said n sequentially delayed signals in the bandpass filter to which it was switched; adding the n delayed, filtered signals to form a first expanded signal pulse; and then switching each of said sequentially delayed signals to a different bandpass filter in the comb filter in a second switching order to yield a second expanded signal pulse approximately orthogonal to said first expanded signal pulse.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-11-15	1986-05-17	1986-11-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-11-15	1990-05-17	1990-11-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-11-15	1994-05-17	1994-11-16	$7700.00	Window Closed / Lapsed

Frequency-phase coding device

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