US3631483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short persistence radar display system
Assignee: Westinghouse Electric Corp
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Filing: 1970-02-19
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Granted: 1971-12-28
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Expires: 1990-02-19
Abstract
Abstract A low PRF radar system display utilizes a cathode-ray tube having a short persistence time in a television type display. The video signal detected from the radar return signal in the receiver is sampled and converted to digital form, and the digital numbers are integrated over each beamwidth of the antenna pattern during an azimuth scan. The digital results of the integration for each beamwidth are stored in separate stores and are read out nondestructively, so that they may be updated during successive azimuth scans, at the raster rate of the TV display. The sequentially readout contents of the stores are converted to analog format and supplied to appropriate control elements of the cathode-ray tube. The operation to provide a processed video output to the display constitutes video cross-correlation and storage and permits use of the television type display.
Inventors
- 👤 Norman A Ruggles
- 👤 Irving I Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:25
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/2806
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
216 words
In a radar system in which pulses are periodically radiated from an antenna having a radiation pattern of known beamwidth, and a return signal is incident on said antenna in response to illumination of a target by all or part of said beamwidth during azimuth scan by said antenna, the combination comprising: means responsive to video signal detected from said return signal for correlation thereof with a signal of preselected characteristics to obtain a measure of enhanced signal-to-noise energy within each said beamwidth during a complete azimuth scan, means responsive to each said measure of enhanced signal-tonoise energy corresponding to each beamwidth of said complete azimuth scan for respective storage of each said measure and for sequentially updating the stored values during each successive complete azimuth scan by said antenna, timing means for synchronizing the operation of said correlation means and said storage means for entry of a measure of signalto-noise energy obtained for a particular beamwidth into a respective storage location associated with that beamwidth, a television display including a cathode-ray tube having a short persistence time, and means further responsive to said timing means for sequentially reading the signal-to-noise energy measures from the respective storage locations of said storage means at the raster rate of said television display for application to said cathode-ray tube.
Claim 2
Dependent Claim
216 words
In a radar system in which pulses are periodically radiated from an antenna having a radiation pattern of known beamwidth, and a return signal is incident on said antenna in response to illumination of a target by all or part of said beamwidth during azimuth scan by said antenna, the combination comprising: means responsive to video signal detected from said return signal for correlation thereof with a signal of preselected characteristics to obtain a measure of enhanced signal-to-noise energy within each said beamwidth during a complete azimuth scan, means responsive to each said measure of enhanced signal-tonoise energy corresponding to each beamwidth of said complete azimuth scan for respective storage of each said measure and for sequentially updating the stored values during each successive complete azimuth scan by said antenna, timing means for synchronizing the operation of said correlation means and said storage means for entry of a measure of signalto-noise energy obtained for a particular beamwidth into a respective storage location associated with that beamwidth, a television display including a cathode-ray tube having a short persistence time, and means further responsive to said timing means for sequentially reading the signal-to-noise energy measures from the respective storage locations of said storage means at the raster rate of said television display for application to said cathode-ray tube.
Claim 3
Dependent Claim
60 words
The combination according to claim 1 further including means responsive to samples of said video signal detected from said return signal for conversion thereof from analog to digital form prior to said correlation thereof, and means responsive to the digital format read from said storage means for conversion to analog form prior to said application to said cathode ray tube.
Claim 4
Dependent Claim
38 words
The combination according to claim 2 wherein said correlation means comprises video integration means responsive to digital representations of said video signal samples for integration thereof over a time interval corresponding to one beamwidth of the azimuth scan.
Claim 5
Dependent Claim
55 words
The combination according to claim 3 wherein said video integration means comprises a plurality of distinct integrators for receiving all of said digital representations, and said timing means introduces a time displacement in the integration of all said digital representations as performed by each of said integrators in accordance with the number of said integrators.
Claim 6
Dependent Claim
34 words
The combination according to claim 4 wherein said plurality of integrators consists of two integrators, one of which is displaced in time of operation from the other by an amount corresponding to one-half beamwidth.
Claim 7
Dependent Claim
41 words
The combination according to claim 5 further including means responsive to the outputs of both said integrators for comparison thereof to select the largest as the measure of the maximum signal-to-noise energy in the beamwidth during which both outputs were obtained.
Claim 8
Dependent Claim
166 words
A radar display system for presenting on a television screen having a short persistence time of producing a visible glow in response to impingement of an electron beam thereon, a visual representation of the radar return signal from a target in a beamwidth of the radar antenna pattern during an azimuth scan of the antenna, said system comprising means responsive to the radar return signal for detection of video signal therefrom, means responsive to the detected video signal for sequential sampling thereof, means responsive to each sample of the video signal for conversion thereof to a representative digital number, means responsive to the digital numbers for integration thereof over each beamwidth of said scan to obtain respective digital signal-to-noise energy measurements, means for selectively storing each signal-to-noise energy measurement for each beamwidth for sequential readout at a predetermined rate compatible with said television screen display, and means responsive to the digital measurements read from said storing means for conversion to analog form to control said display.
Claim 9
Dependent Claim
166 words
A radar display system for presenting on a television screen having a short persistence time of producing a visible glow in response to impingement of an electron beam thereon, a visual representation of the radar return signal from a target in a beamwidth of the radar antenna pattern during an azimuth scan of the antenna, said system comprising means responsive to the radar return signal for detection of video signal therefrom, means responsive to the detected video signal for sequential sampling thereof, means responsive to each sample of the video signal for conversion thereof to a representative digital number, means responsive to the digital numbers for integration thereof over each beamwidth of said scan to obtain respective digital signal-to-noise energy measurements, means for selectively storing each signal-to-noise energy measurement for each beamwidth for sequential readout at a predetermined rate compatible with said television screen display, and means responsive to the digital measurements read from said storing means for conversion to analog form to control said display.
Claim 10
Dependent Claim
40 words
The system defined by claim 7 further including means for coordinating the operational timing of said integration means and of the storing and readout of said storing means in accordance with the timing of the azimuth scan of said antenna.
Claim 11
Dependent Claim
95 words
The system defined by claim 8 wherein said integration means includes a first integrator and a second integrator, said first and second integrators connected to integrate the digital numbers produced by said conversion means, said second integrator being delayed by said time coordinating means to integrate digital numbers occurring one-half beamwidth after those integrated by said first integrator, and means responsive to the digital outputs of both said integrators for one beamwidth for selecting the larger of those outputs as representing the maximum signal-to-noise energy in the last-named beamwidth, for application to said storing means.
Claim 12
Dependent Claim
57 words
The system defined by claim 9 wherein said storing means comprises a plurality of distinct stores, each for retaining a signal-to-noise energy measurement corresponding to a respective beamwidth over a complete azimuth scan, and switch meaNs for each of said stores for entry and readout of digital data from said integration means and to said display, respectively.
Claim 13
Dependent Claim
35 words
The system defined by claim 10 wherein each of said stores is constructed and arranged to provide nondestructive readout of its contents, for updating its respective contents over successive complete azimuth scans of said antenna.
References Cited (Backward Citations)
US3277471A
Cited
US3230530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |