US3577143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended range spectrum analysis radar
Assignee: Individual
•
Filing: 1969-04-08
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Granted: 1971-05-04
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Expires: 1989-04-08
Abstract
Abstract A radar system in which the return 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 the target. To extend the maximum range of the system the reference signal is delayed relative to the received signal, and to decrease the minimum range the received signal is delayed relative to the reference signal.
Inventors
- 👤 Joseph L Poirier
- 👤 John K Schindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A spectrum analysis radar system providing zero minimum range comprising means to generate a stationary time signal, means to delay said generated signal for a predetermined time, means to direct said delayed stationary time signal towards a target of interest, means to receive a signal reflected from said target of interest, means to restrict said generated time signal to a predetermined magnitude, means to sum said received signal and said restricted signal to provide as an output therefrom a modulated power spectrum signal having nulls, and means to measure the frequency difference between said nulls to provide target information down to zero range.
Claim 2
Dependent Claim
103 words
A spectrum analysis radar system providing zero minimum range comprising means to generate a stationary time signal, means to delay said generated signal for a predetermined time, means to direct said delayed stationary time signal towards a target of interest, means to receive a signal reflected from said target of interest, means to restrict said generated time signal to a predetermined magnitude, means to sum said received signal and said restricted signal to provide as an output therefrom a modulated power spectrum signal having nulls, and means to measure the frequency difference between said nulls to provide target information down to zero range.
Claim 3
Dependent Claim
42 words
A spectrum analysis radar system as described in claim 1 further including filter means to limit the bandwidth of said generated stationary time signal to be equal to the ratio of the speed of light divided by the range to said target.
Claim 4
Dependent Claim
25 words
A spectrum analysis radar system as described in claim 1 wherein said means to generate a stationary time signal consists of an unmodulated noise generator.
Claim 5
Dependent Claim
39 words
A spectrum analysis radar system as described in claim 2 wherein the means to restrict said generated signal is comprised of a directional coupler receiving the filtered signal and an attenuator being fed the output of said directional coupler.
Claim 6
Dependent Claim
27 words
A spectrum analysis radar system as described in claim 1 wherein said means to measure consists of a spectrum analyzer receiving the output from said summing means.
Claim 7
Dependent Claim
26 words
A spectrum analysis radar system as described in claim 1 further including means to amplify said received signal prior to being fed to said summing means.
Claim 8
Dependent Claim
138 words
An extended range spectrum analysis radar system comprising means to generate a stationary time signal, means to direct said generated stationary time signal to a target of interest, means to receive a signal reflected from said target of interest, means to restrict the magnitude of said generated stationary time signal to a predetermined magnitude, means to delay said restricted signal a predetermined time to provide a reference signal, means to sum said reference signal and said received signal to provide as an output therefrom a modulated power spectrum signal having nulls, means to measure the frequency difference between said nulls to provide target information at extended ranges, and filter means to limit and bandwidth of said generated stationary time signal to be equal to the ratio of the speed of light divided by the range to said target.
Claim 9
Dependent Claim
138 words
An extended range spectrum analysis radar system comprising means to generate a stationary time signal, means to direct said generated stationary time signal to a target of interest, means to receive a signal reflected from said target of interest, means to restrict the magnitude of said generated stationary time signal to a predetermined magnitude, means to delay said restricted signal a predetermined time to provide a reference signal, means to sum said reference signal and said received signal to provide as an output therefrom a modulated power spectrum signal having nulls, means to measure the frequency difference between said nulls to provide target information at extended ranges, and filter means to limit and bandwidth of said generated stationary time signal to be equal to the ratio of the speed of light divided by the range to said target.
Claim 10
Dependent Claim
25 words
A spectrum analysis radar system as described in claim 7 wherein said means to generate a stationary time signal consists of an unmodulated noise generator.
Claim 11
Dependent Claim
39 words
A spectrum analysis radar system as described in claim 7 wherein the means to restrict said generated signal is comprised of a directional coupler receiving the filtered signal and an attenuator being fed the output of said directional coupler.
Claim 12
Dependent Claim
27 words
A spectrum analysis radar system as described in claim 7 wherein said means to measure consists of a spectrum analyzer receiving the output from said summing means.
Claim 13
Dependent Claim
26 words
A spectrum analysis radar system as described in claim 7 further including means to amplify said received signal prior to being fed to said summing means.
Claim 14
Independent Claim
118 words
A method of providing a minimum range down to zero for a spectrum analysis radar comprising geNerating a stationary time signal having a bandwidth at least equal to the ratio of the speed of light divided by a preselected delayed range, utilizing a portion of said time stationary signal as a reference signal, directing said time stationary signal towards a target of interest, receiving a signal returned from said target of interest, delaying said received signal relative to said reference signal, summing said delayed received signal and said reference signal to provide a modulated power spectrum output signal having nulls, and measuring the frequency difference between said nulls to provide target information down to said zero minimum range.
Claim 15
Independent Claim
118 words
A method of providing a minimum range down to zero for a spectrum analysis radar comprising geNerating a stationary time signal having a bandwidth at least equal to the ratio of the speed of light divided by a preselected delayed range, utilizing a portion of said time stationary signal as a reference signal, directing said time stationary signal towards a target of interest, receiving a signal returned from said target of interest, delaying said received signal relative to said reference signal, summing said delayed received signal and said reference signal to provide a modulated power spectrum output signal having nulls, and measuring the frequency difference between said nulls to provide target information down to said zero minimum range.
Claim 16
Independent Claim
117 words
A method of extending the target range of a spectrum analysis radar comprising generating a stationary time signal having a bandwidth at least equal to the ratio of the speed of light divided by a preselected delayed range, utilizing a predetermined portion of said time stationary signal as a reference signal, directing said time stationary signal towards a target of interest, receiving a signal returned from said target of interest, delaying said reference signal a predetermined time in relation to said received signal, summing said delayed signal and said received signal to provide a modulated power spectrum output signal having nulls, and measuring the frequency difference between said nulls to provide target information of said extended range.
Claim 17
Independent Claim
117 words
A method of extending the target range of a spectrum analysis radar comprising generating a stationary time signal having a bandwidth at least equal to the ratio of the speed of light divided by a preselected delayed range, utilizing a predetermined portion of said time stationary signal as a reference signal, directing said time stationary signal towards a target of interest, receiving a signal returned from said target of interest, delaying said reference signal a predetermined time in relation to said received signal, summing said delayed signal and said received signal to provide a modulated power spectrum output signal having nulls, and measuring the frequency difference between said nulls to provide target information of said extended range.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |