US3732563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse train decoder-degarbler
Assignee: United States Department of the Navy
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Filing: 1971-07-12
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Granted: 1973-05-08
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Expires: 1991-07-12
Abstract
Abstract A decoder-degarbler for increasing the decoding efficiency of IFF decoders in the presence of garbled signals. Three delay lines and logic circuitry are utilized to detect the presence of a garble condition and bracket decode condition. A coincidence means then determines if an established decoding criteria has been met whereby there is a degarbled bracket decode output to permit decoding of the pulse train data input.
Inventors
- 👤 G Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:56
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S13/781; G01S13/784
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
An IFF decoder-degarbler comprising: a transponder reply pulse train signal; means for detecting the framing pulses of said transponder signal comprising a plurality of equal delay lines, each of said delay lines comprising a plurality of shift registers, said delay lines having a plurality of output taps; and a source of clock pulses coupled to said delay lines for shifting said transponder signal through said delay lines; means for indicating the non-presence of a garble condition; and coincidence means coupled to said detecting and indicating means for permitting decoding of said transponder signal.
Claim 2
Dependent Claim
93 words
An IFF decoder-degarbler comprising: a transponder reply pulse train signal; means for detecting the framing pulses of said transponder signal comprising a plurality of equal delay lines, each of said delay lines comprising a plurality of shift registers, said delay lines having a plurality of output taps; and a source of clock pulses coupled to said delay lines for shifting said transponder signal through said delay lines; means for indicating the non-presence of a garble condition; and coincidence means coupled to said detecting and indicating means for permitting decoding of said transponder signal.
Claim 3
Dependent Claim
31 words
An IFF decoder-degarbler as recited in claim 1 wherein said detecting means comprises an AND gate coupled to the input and output of the second of said plurality of delay lines.
Claim 4
Dependent Claim
18 words
An IFF decoder-degarbler as recited in claim 2 wherein said gate indicating means further comprises an OR gate.
Claim 5
Dependent Claim
53 words
An IFF decoder-degarbler as recited in claim 3 further including a plurality of first AND gates, each of said first AND gates having their inputs coupled to taps on said delay lines separated by a time delay equal to that of a delay line, said first AND gate coupled to said OR gate.
Claim 6
Dependent Claim
53 words
An IFF decoder-degarbler as recited in claim 4 further including first register means coupled between said detecting means and said coincidence means; and second register means and NOT gates coupled between said OR gate and said coincidence means; whereby said first and second register means establish decoding criteria for said pulse train signal.
Claim 7
Dependent Claim
54 words
An IFF decoder-degarbler as recited in claim 5 further including second AND gates coupled to the output taps of said second delay lines; and a delay register coupled between said coincidence means and each of said second AND gates for synchronizing the coincidence means output with the output of said second delay line taps.
Claim 8
Dependent Claim
31 words
An IFF decoder-degarbler as recited in claim 6 wherein said plurality of delay lines comprise three delay lines of 20.3 microseconds and each of said delay lines have 15 output taps.
Claim 9
Dependent Claim
51 words
An IFF decoder-degarbler comprising: a transponder reply pulse train signal; equal delay means with gates coupled thereto for detecting the framing pulses of said transponder signal; means for indicating the non-presence of garble condition; and coincidence means coupled to said detecting and indicating means for permitting decoding of said transponder signal.
Claim 10
Dependent Claim
51 words
An IFF decoder-degarbler comprising: a transponder reply pulse train signal; equal delay means with gates coupled thereto for detecting the framing pulses of said transponder signal; means for indicating the non-presence of garble condition; and coincidence means coupled to said detecting and indicating means for permitting decoding of said transponder signal.
References Cited (Backward Citations)
US3188629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |