Squint-mode spatial filter

Claim 2

In a video signalling system having scan-converter storage means for providing a periodic output, successive portions of which include a frequency-multiplied spectral content of a corresponding successive sample of a sampled periodic video input to said scan converter means, and a fixed-bandpass filter responsive to the output of said scan converter means, the combination comprising means cooperating with a read-scan mode of said scan coverter means for successively increasing the frequency multiplication of said frequency-multiplied spectral output for successive portions of said sampled periodic video input; and frequency translating means interposed between said output of said scan converter means and an input of said filter for frequency-biasing said multiplied spectral content by a successively increasing amount for successive portions of said sampled video input.

Claim 3

In a video signalling system having scan converter storage means for providing a periodic output, successive portions of which include a frequency-multiplied spectral content of a corresponding successive sample of a sampled periodic video input to said scan converter, and a fixed-band pass filter, means for successively reducing the bandwidth of successive samples of said sampled video input to which said fixed bandpass filter responds, and comprising in combination means for successively increasing the frequency multiplication of said frequency-multiplied spectral content for successive portions of said sampled video input; and frequency translating means drivingly coupled to an input of said filter for translating the center frequency of said successively increased frequency-multiplied spectral content to a preselected frequency corresponding to a center frequency of said filter.

Claim 4

In a video signalling system having scan converter storage means for providing a periodic output, successive portions of which include a frequency-multiplied spectral content of a corresponding successive sample of a sampled periodic video input to said scan converter, and a fixed-band pass filter, means for successively reducing the bandwidth of successive samples of said sampled video input to which said fixed bandpass filter responds, and comprising in combination means for successively increasing the frequency multiplication of said frequency-multiplied spectral content for successive portions of said sampled video input; and frequency translating means drivingly coupled to an input of said filter for translating the center frequency of said successively increased frequency-multiplied spectral content to a preselected frequency corresponding to a center frequency of said filter.

Claim 5

The device of claim 2 in which said scan converter storage means includes a read-sweep input and in which said means for successively increasing comprises means for progressively increasing the rate at which said successive portions of the sampled video input are read-swept by said scan converter.

Claim 6

The device of claim 2 in which said scan converter storage means includes a read-sweep input and in which said means for successively increasing comprises gain control means for multiplying the gain of said read-sweep input as a function of range-time.

Claim 7

The device of claim 2 in which said scan converter storage means includes a read-sweep input and in which said means for successively increasing comprises a ramp function generator having a periodicity equal to the periodicity of a read-scan output of said scan converter means; and a gain control circuit interposed at the read-sweep input of said scan converter storage means and having a gain control input responsively coupled to an output of said generator.

Claim 8

The device of claim 5 in which said frequency translating means is responsively coupled to the output of said ramp function generator.

Claim 9

The device of claim 5 in which said frequency means comprises a voltage controlled oscillator responsively coupled to an output of said ramp Function generator; and single sideband modulating means interposed between the output of said scan converter storage means and said input of said filter and having a modulation input responsively coupled to an output of said voltage controlled oscillator.

Claim 10

In a pulsed energy system adapted for an airborne, squint-mode ground map application, means for providing a range-trace display signal indicative of a system resolution corresponding to a preselected lineal transverse extent and comprising frequency-multiplication means responsive to the video range-trace envelope of an output of said system for providing a successively increased frequency multiplication of the spectral content of said video envelope for successive portions of said range trace signal; frequency translating means coupled to the output of said frequency-multiplied spectral content of said video envelope for frequency biasing of said frequency-multiplication means for translating a center frequency of said frequency multiplied spectral content to a preselected frequency; and a fixed-bandpass filter having a center frequency corresponding to said preselected frequency and a bandpass corresponding to said preselected lineal transverse extent.

Claim 11

In a pulsed energy system adapted for an airborne, squint-mode ground map application, means for providing a range-trace display signal indicative of a system resolution corresponding to a preselected lineal transverse extent and comprising frequency-multiplication means responsive to the video range-trace envelope of an output of said system for providing a successively increased frequency multiplication of the spectral content of said video envelope for successive portions of said range trace signal; frequency translating means coupled to the output of said frequency-multiplied spectral content of said video envelope for frequency biasing of said frequency-multiplication means for translating a center frequency of said frequency multiplied spectral content to a preselected frequency; and a fixed-bandpass filter having a center frequency corresponding to said preselected frequency and a bandpass corresponding to said preselected lineal transverse extent.

Claim 12

In a pulsed energy ranging system adapted for an airborne squint-mode ground map application, spatial filter means for providing a system resolution corresponding to an energy lobe beamwidth having a uniform lineal transverse extent and comprising in combination scan converter storage means for storing a plurality of range trace signals and having a read-sweep input for range-sample read-sweeping corresponding range bin portions of said stored range trace signals; a ramp function generator having a periodicity equal to that of a read-scan output of said scan converter means for increasing the rate of said read-sweep input as a function of sampled range; a voltage-controlled-local oscillator having a control input responsively coupled to an output of said ramp-function generator; means for selectively biasing said input of said voltage-controlled oscillator; a bandpass filter responsively coupled to said read-scan output of said scan converter storage means; and single-side band modulating means interposed between said scan converter storage means and said band pass filter and having a modulating input coupled to an output of said voltage-controlled oscillator.

Claim 13

In a pulsed energy ranging system adapted for an airborne squint-mode ground map application, spatial filter means for providing a system resolution corresponding to an energy lobe beamwidth having a uniform lineal transverse extent and comprising in combination scan converter storage means for storing a plurality of range trace signals and having a read-sweep input for range-sample read-sweeping corresponding range bin portions of said stored range trace signals; a ramp function generator having a periodicity equal to that of a read-scan output of said scan converter means for increasing the rate of said read-sweep input as a function of sampled range; a voltage-controlled-local oscillator having a control input responsively coupled to an output of said ramp-function generator; means for selectively biasing said input of said voltage-controlled oscillator; a bandpass filter responsively coupled to said read-scan output of said scan converter storage means; and single-side band modulating means interposed between said scan converter storage means and said band pass filter and having a modulating input coupled to an output of said voltage-controlled oscillator.

Claim 14

In combination, a pulsed energy system adapted for an airborne squint-mode groundmap application and having a video receiver output response; and means cooperating with said system for providing a system resolution corresponding to a preselected lineal transverse extent and comprising means for progressively limiting as a function of range-time that bandwidth of a received video envelope for which an output response is provided.

Claim 15

In combination, a pulsed energy system adapted for an airborne squint-mode groundmap application and having a video receiver output response; and means cooperating with said system for providing a system resolution corresponding to a preselected lineal transverse extent and comprising means for progressively limiting as a function of range-time that bandwidth of a received video envelope for which an output response is provided.

Claim 16

In a pulsed energy ranging system adapted for an airborne squint-mode ground map application, means for providing a system resolution corresponding to a preselected lineal transverse extent and comprising means for progressively limiting as a function of range time that bandwidth of a received video envelope for which an output response is provided, and including bandwidth multiplying means for progressively multiplying the bandwidth of said video envelope as a function of range-time; and fixed bandwidth means responsive to said progressively bandwidth multiplied video envelope.

Claim 17

In a pulsed energy ranging system adapted for an airborne squint-mode ground map application, means for providing a system resolution corresponding to a preselected lineal transverse extent and comprising means for progressively limiting as a function of range time that bandwidth of a received video envelope for which an output response is provided, and including bandwidth multiplying means for progressively multiplying the bandwidth of said video envelope as a function of range-time; and fixed bandwidth means responsive to said progressively bandwidth multiplied video envelope.