US4627075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of identifying possible valid data pulses in a position coded pulse train
Assignee: Vega Precision Laboratories Inc
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Filing: 1983-10-19
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Granted: 1986-12-02
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Expires: 2003-10-19
Abstract
Abstract Pulse position coding is used to transmit several channels of data from a ground radar transmitter to a receiver in an airborne, remotely-piloted vehicle. The system is designed to ignore interfering pulses, especially those which are synchronized with the transmitter's PRF, by combining a number of noise reduction devices. These include the redundant transmission of address and channel information, the transmission of true and complemented data, the tracking of channels transmitted in a predetermined order, developing an interference count to recognize synchronous pulses, comparing data received for a given channel with data subsequently received for that channel, the use of windows around the expected positions of pulses, and the use of parity. There is also a novel programming arrangement which enables several programs to be stored in a reduced amount of memory space.
Inventors
- 👤 Robert F. Fleming, III
- 👤 Raymond F. Irby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:32
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/003; G01S7/006; G01S7/02; G01S7/023; G01S7/0232; G01S7/0234; G01S7/28; G01S7/285; G01S7/292; G01S7/2923; G01S7/2928; G05; G05D; G05D1/00; G05D1/0011; G05D1/0022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A method of identifying possible data pulses in a position-coded pulse train in the presence of synchronous interference, said method comprising the steps of: establishing a data pulse window; dividing the data pulse window into a first set of contiguous interference windows and a second set of contiguous interference windows, the second set overlapping the first set; storing a first interference count for each pulse occurring within a window of the first set of interference windows and a second interference count for said pulse occurring within a window of the second set of interference windows, said interference counts representing the frequency of occurrence of pulses in each interference window of said sets; eliminating all pulses for which at least one of the two interference counts exceeds a predetermined maximum; and identifying the remaining pulses as possible data pulses.
Claim 2
Independent Claim
138 words
A method of identifying possible data pulses in a position-coded pulse train in the presence of synchronous interference, said method comprising the steps of: establishing a data pulse window; dividing the data pulse window into a first set of contiguous interference windows and a second set of contiguous interference windows, the second set overlapping the first set; storing a first interference count for each pulse occurring within a window of the first set of interference windows and a second interference count for said pulse occurring within a window of the second set of interference windows, said interference counts representing the frequency of occurrence of pulses in each interference window of said sets; eliminating all pulses for which at least one of the two interference counts exceeds a predetermined maximum; and identifying the remaining pulses as possible data pulses.
Claim 3
Independent Claim
134 words
A method of identifying possible data pulses in a plurality of position-coded pulse trains in the presence of synchronous interference, said method comprising the steps of: establishing an enabling signal window during a period representing a predicted occurrence of each of said pulse trains; storing the arrival time of each pulse arriving during the period of said enabling signal window; dividing said enabling signal window into at least one set of contiguous interference windows; storing, for each interference window, an interference count representing the frequency of occurrence of pulses in that interference window; eliminating all pulses for which the stored arrival time is not within predetermined maximum and minimum data pulse limits; eliminating all pulses for which the stored interference count exceeds a predetermined maximum; and identifying the remaining pulses as possible data pulses.
Claim 4
Independent Claim
134 words
A method of identifying possible data pulses in a plurality of position-coded pulse trains in the presence of synchronous interference, said method comprising the steps of: establishing an enabling signal window during a period representing a predicted occurrence of each of said pulse trains; storing the arrival time of each pulse arriving during the period of said enabling signal window; dividing said enabling signal window into at least one set of contiguous interference windows; storing, for each interference window, an interference count representing the frequency of occurrence of pulses in that interference window; eliminating all pulses for which the stored arrival time is not within predetermined maximum and minimum data pulse limits; eliminating all pulses for which the stored interference count exceeds a predetermined maximum; and identifying the remaining pulses as possible data pulses.
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |