Patent US4050764A successfully refreshed from Google Patents.
Patent US3568189A successfully refreshed from Google Patents.
US3568189A
Expired / Lapsed
US
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Spectrum analysis radar system for angle determination
Assignee: Individual
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Filing: 1969-03-11
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Granted: 1971-03-02
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Expires: 1989-03-11
Abstract
Abstract Spectrum analysis radar system in which the location of modulation nulls depends upon the exact electrical range to a target so that with two antennas separated by a known distance, the small difference in range to a target causes the null location to shift relative to each other to provide the angle of arrival of the reflected taget.
Inventors
- 👤 Joseph L Poirier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:03
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
A spectrum analysis radar to measure the angle of arrival of a reflected signal from a target of interest comprising means to generate a stationary time signal, means to direct said stationary time signal to said target of interest, first and second antenna means to receive said reflected signals from said target of interest, said first antenna means being separated from said second antenna means by a predetermined distance to cause a small difference in range to said target of interest, means to select a predetermined portion of said stationary time signal, first summing means receiving simultaneously said predetermined portion of said stationary time signal and the output of said first antenna means to provide a first modulated resultant signal having nulls, second summing means also receiving simultaneously said predetermined portion of said stationary time signal and the output from said second antenna means to provide a second modulated resultant signal having nulls and means to measure the shift in nulls between said first and second resultant signals to provide said measure of angle.
Claim 2
Dependent Claim
174 words
A spectrum analysis radar to measure the angle of arrival of a reflected signal from a target of interest comprising means to generate a stationary time signal, means to direct said stationary time signal to said target of interest, first and second antenna means to receive said reflected signals from said target of interest, said first antenna means being separated from said second antenna means by a predetermined distance to cause a small difference in range to said target of interest, means to select a predetermined portion of said stationary time signal, first summing means receiving simultaneously said predetermined portion of said stationary time signal and the output of said first antenna means to provide a first modulated resultant signal having nulls, second summing means also receiving simultaneously said predetermined portion of said stationary time signal and the output from said second antenna means to provide a second modulated resultant signal having nulls and means to measure the shift in nulls between said first and second resultant signals to provide said measure of angle.
Claim 3
Dependent Claim
71 words
A spectrum analysis radar as described in claim 1 wherein said means to measure said shift in nulls is comprised of first and second spectrum analyzers receiving said first and second resultant signals, respectively, first and second means to detect and filter the outputs of said first and second spectrum analyzers, respectively, and means to measure the phase difference between the outputs of said first and second detector and filter means.
Claim 4
Dependent Claim
33 words
A spectrum analysis radar as described in claim 1 further including filter means to restrict the bandwidth of said generated stationary time signal, and means to amplify the output from said filter means.
Claim 5
Dependent Claim
49 words
A spectrum analysis radar as described in claim 1 wherein said means to select a portion of said stationary time signal is comprised of a directional coupler, an attenuator receiving the output of said directional coupler and an isolator interconnecting said attenuator and said first and second summing means.
Claim 6
Dependent Claim
47 words
A spectrum analysis radar as defined in claim 1 further including first and second amplifying means receiving the output of said first and second antenna means, respectively, and first and second isolators interconnecting said first And second amplifying means and said first and second summing means, respectively.
Claim 7
Dependent Claim
24 words
A spectrum analysis radar as defined in claim 1 wherein said means to generate a stationary time signal consists of an unmodulated noise source.
Claim 8
Dependent Claim
166 words
A spectrum analysis radar to measure the angle of arrival of a modulated reflected signal from a target of interest comprising means to generate a stationary time signal, means to direct said stationary time signal to said target of interest, first and second antenna means to receive said modulated reflected signals from said target of interest, said first and second antenna means being separated a predetermined distance from each other to cause a small difference in range to said target of interest, means to sequentially sample the outputs of said first and second antenna means at a predetermined rate, means to select a predetermined portion of said stationary time signal, summing means receiving simultaneously said predetermined portion of said stationary time signal and the output of said sampling means, said summing means providing a modulated output signal having nulls, and comparison means connected to the output of said summing means to measure the difference between said nulls to provide a measure of said angle of arrival.
Claim 9
Dependent Claim
166 words
A spectrum analysis radar to measure the angle of arrival of a modulated reflected signal from a target of interest comprising means to generate a stationary time signal, means to direct said stationary time signal to said target of interest, first and second antenna means to receive said modulated reflected signals from said target of interest, said first and second antenna means being separated a predetermined distance from each other to cause a small difference in range to said target of interest, means to sequentially sample the outputs of said first and second antenna means at a predetermined rate, means to select a predetermined portion of said stationary time signal, summing means receiving simultaneously said predetermined portion of said stationary time signal and the output of said sampling means, said summing means providing a modulated output signal having nulls, and comparison means connected to the output of said summing means to measure the difference between said nulls to provide a measure of said angle of arrival.
Claim 10
Dependent Claim
24 words
A spectrum analysis radar as described in claim 7 wherein said means to generate a stationary time signal consists of an unmodulated noise source.
Claim 11
Dependent Claim
66 words
A spectrum analysis radar as described in claim 7 further including filter means to restrict the bandwidth of said stationary time signal, a first amplifier receiving the output of said filter means, a transmitting antenna, a directional coupler interconnecting said first amplifying means and said transmitting antenna, and an attenuator also connected to said directional coupler, said attenuator providing an input signal to said summing means.
References Cited (Backward Citations)
US2958862A
Cited
US3444555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |