Patent US4002827A successfully refreshed from Google Patents.
US4002827A
Expired / Lapsed
US
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Polar coordinate format to a cartesian coordinate format scan converter
Assignee: General Electric Co
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Filing: 1975-05-15
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Granted: 1977-01-11
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Expires: 1995-05-15
Abstract
Abstract A slow scan radar signal is converted from a polar coordinate format to a cartesian coordinate format to permit the radar signal to be displayed on a television type display device. The radar signal, in analog form, is converted to a digital signal, placed in a memory to permit readout of the data in a cartesian coordinate format and converted from a digital to analog signal which may then be applied to the television type display device.
Inventors
- 👤 Robert Leland Nevin
- 👤 John Joseph O'Leary
- 👤 Leonard Joseph Cikotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/544; G06F7/548; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/295; G01S7/298
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
In a radar system including an angularly scanned antenna and an associated receiver system, a scan converter for converting pulse-generated radar data received via said antenna -- receiver system in polar coordinate scan format to an x-y cartesian coordinate format comprising, in combination: means for generating a cosine signal representative of the cosine of the antenna angle, said angle being defined by the angle between the polar coordinate radius along with said radar data is generated and a predetermined reference radius; means operating in response to said cosine signal for generating a train of clock pulses for each radar pulse, the repetition rate of said pulses being a function of the cosine of said angle; sampling means for generating a data signal representative of said radar in response to each of said clock pulses; memory means having storage locations addressible in accordance with said x-y cartesian coordinate format; means for loading said data signals into said memory means including a Y-address counter and means for incrementing said counter synchronism with said clock pulses, and means for reading said data signals out of said memory in a sequence compatible with said cartesian coordinate format.
Claim 2
Dependent Claim
193 words
In a radar system including an angularly scanned antenna and an associated receiver system, a scan converter for converting pulse-generated radar data received via said antenna -- receiver system in polar coordinate scan format to an x-y cartesian coordinate format comprising, in combination: means for generating a cosine signal representative of the cosine of the antenna angle, said angle being defined by the angle between the polar coordinate radius along with said radar data is generated and a predetermined reference radius; means operating in response to said cosine signal for generating a train of clock pulses for each radar pulse, the repetition rate of said pulses being a function of the cosine of said angle; sampling means for generating a data signal representative of said radar in response to each of said clock pulses; memory means having storage locations addressible in accordance with said x-y cartesian coordinate format; means for loading said data signals into said memory means including a Y-address counter and means for incrementing said counter synchronism with said clock pulses, and means for reading said data signals out of said memory in a sequence compatible with said cartesian coordinate format.
Claim 3
Dependent Claim
35 words
The scan converter set forth in claim 1 wherein said sampling means includes analog-to-digital converter means for generating said data signals in digital form and wherein said memory means includes means for storing digital signals.
Claim 4
Dependent Claim
193 words
In a radar system including an angularly scanned antenna and an associated receiver system; a scan converter for converting pulse-generated radar data received via said antenna -- receiver system in polar coordinate scan format to an x-y cartesian coordinate format comprising, in combination: means for generating a sine signal representative of the sine of the antenna angle, said angle being defined by the angle between the polar coordinate radius along with said radar data is generated and predetermined reference radius; means operating in response to said sine signal for generating a train of clock pulses for each radar pulse, the repetition rate of said pulses being a function of the sine of said angle; sampling means for generating a data signal representative of said radar in response to each of said clock pulses; memory means having storage locations addressible in accordance with said X-Y cartesian cordinate format; means for loading said data signals into said memory means including a X-address counter and means for incrementing said counter in synchronism with said clock pulses; and means for reading said data signals out of said memory in a sequence compatible with said cartesian coordinate format.
Claim 5
Dependent Claim
193 words
In a radar system including an angularly scanned antenna and an associated receiver system; a scan converter for converting pulse-generated radar data received via said antenna -- receiver system in polar coordinate scan format to an x-y cartesian coordinate format comprising, in combination: means for generating a sine signal representative of the sine of the antenna angle, said angle being defined by the angle between the polar coordinate radius along with said radar data is generated and predetermined reference radius; means operating in response to said sine signal for generating a train of clock pulses for each radar pulse, the repetition rate of said pulses being a function of the sine of said angle; sampling means for generating a data signal representative of said radar in response to each of said clock pulses; memory means having storage locations addressible in accordance with said X-Y cartesian cordinate format; means for loading said data signals into said memory means including a X-address counter and means for incrementing said counter in synchronism with said clock pulses; and means for reading said data signals out of said memory in a sequence compatible with said cartesian coordinate format.
Claim 6
Dependent Claim
35 words
The scan converter set forth in claim 3 wherein said sampling means includes analog-to-digital converter means for generating said data signals in digital form and wherein said memory means includes means for storing digital signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |