Patent US2423358A successfully refreshed from Google Patents.
Patent US3603990A successfully refreshed from Google Patents.
US3603990A
Expired / Lapsed
US
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Spectrum analysis radar system
Assignee: Individual
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Filing: 1968-07-23
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Granted: 1971-09-07
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Expires: 1988-07-23
Abstract
Abstract A radar system and method in which the returned target signal is added to a reference signal derived from the original transmitted signal. The power spectrum of the sum signal is modulated. The modulation frequency is a linear function of the range and is measured to determine the range to a target. The transmitted signal must be time stationary (i.e., a noiselike signal) and the range to the target must be equal to or greater than the ratio of the speed of light divided by the bandwidth of the signal.
Inventors
- 👤 Joseph L Poirier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:35
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A spectrum analysis radar method comprising illuminating a target by exclusively a time stationary signal such as unmodulated noise, summing the reflected signal from said target and a portion of the time stationary signal to provide a modulated power spectrum having nulls, equalizing the magnitude of said time stationary signal and said reflected signal prior to said summing, and measuring the frequency difference between the nulls to provide target information.
Claim 2
Dependent Claim
70 words
A spectrum analysis radar method comprising illuminating a target by exclusively a time stationary signal such as unmodulated noise, summing the reflected signal from said target and a portion of the time stationary signal to provide a modulated power spectrum having nulls, equalizing the magnitude of said time stationary signal and said reflected signal prior to said summing, and measuring the frequency difference between the nulls to provide target information.
Claim 3
Dependent Claim
40 words
A spectrum analysis radar method as described in claim 1 wherein the step of illuminating said target is comprised of the step of generating said time stationary signal, and the step of transmitting said time stationary signal toward said target.
Claim 4
Dependent Claim
35 words
A spectrum analysis radar method as described in claim 1 wherein the range to said target is equal to or greater than the speed of light divided by the bandwidth of the time stationary signal.
Claim 5
Dependent Claim
86 words
A spectrum analysis radar system comprising means to generate exclusively a time stationary signal such as unmodulated noise, means to direct said time stationary signal towards a target to provide a reflected signal therefrom, means to sum said reflected signal and said time stationary signal to provide a modulated power spectrum having nulls, means to equalize the magnitude of said time stationary signal and said reflected signal prior to the summing operation, and means to measure the frequency difference between said nulls to provide target information.
Claim 6
Dependent Claim
86 words
A spectrum analysis radar system comprising means to generate exclusively a time stationary signal such as unmodulated noise, means to direct said time stationary signal towards a target to provide a reflected signal therefrom, means to sum said reflected signal and said time stationary signal to provide a modulated power spectrum having nulls, means to equalize the magnitude of said time stationary signal and said reflected signal prior to the summing operation, and means to measure the frequency difference between said nulls to provide target information.
Claim 7
Dependent Claim
26 words
A spectrum analysis radar system as described in claim 4 further including means to couple a portion of said time stationary signal from said generating means.
Claim 8
Dependent Claim
31 words
A spectrum analysis radar system as described in claim 4 wherein said means to measure said frequency difference is comprised of a spectrum analyzer measuring the output of said summing means.
Claim 9
Dependent Claim
58 words
A spectrum analysis radar system as described in claim 6 wherein said means to measure said frequency difference is comprised of a first spectrum analyzer receiving the output of said summing means, a detector and a filter receiving the output of said first spectrum analyzer, and a second spectrum analyzer receiving the output from said detector and filter.
Claim 10
Dependent Claim
26 words
A spectrum analysis radar system as described in claim 4 further including means to restrict the bandwidth of said time stationary signal to a preselected value.
Claim 11
Dependent Claim
166 words
A spectrum analysis radar system comprising means to generate exclusively an unmodulated noise signal, filter means to restrict the bandwidth of said noise signal to a preselected value, a directional coupler receiving the output from said filter means, said directional coupler providing a first output noise signal, and a second output noise signal with said second output noise signal being a preselected portion of the output from said filter means, an antenna receiving said first output noise signal to be directed to a target of interest to provide a reflected signal therefrom, a summing network receiving said reflected signal and said second output signal and providing as an output a modulated power spectrum having nulls, attenuator means interposed between said directional coupler and said summing means to adjust the magnitude of said second output noise signal to be substantially equal to that of the amplified reflected signal prior to the summing operation, and means to measure the frequency difference between said nulls to provide target information.
Claim 12
Dependent Claim
166 words
A spectrum analysis radar system comprising means to generate exclusively an unmodulated noise signal, filter means to restrict the bandwidth of said noise signal to a preselected value, a directional coupler receiving the output from said filter means, said directional coupler providing a first output noise signal, and a second output noise signal with said second output noise signal being a preselected portion of the output from said filter means, an antenna receiving said first output noise signal to be directed to a target of interest to provide a reflected signal therefrom, a summing network receiving said reflected signal and said second output signal and providing as an output a modulated power spectrum having nulls, attenuator means interposed between said directional coupler and said summing means to adjust the magnitude of said second output noise signal to be substantially equal to that of the amplified reflected signal prior to the summing operation, and means to measure the frequency difference between said nulls to provide target information.
Claim 13
Dependent Claim
37 words
A spectrum analysis radar system as described in claim 9 further including a first amplifier interposed between said filter means and said directional coupler, and a second amplIfier receiving said reflected signal prior to the summing operation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |