Methods and apparatus for tracking pulse trains
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-023/00
G01S-007/292
G01S-003/02
G01S-007/02
G01S-007/28
G01R-023/15
출원번호
US-0818658
(2015-08-05)
등록번호
US-10073161
(2018-09-11)
발명자
/ 주소
Marr, Harry
Caldwell, Jeffrey
Robinson, Ian S.
출원인 / 주소
RAYTHEON COMPANY
대리인 / 주소
Daly, Crowley, Mofford & Durkee, LLP
인용정보
피인용 횟수 :
0인용 특허 :
11
초록
Method and apparatus for tracking pulse trains from one or more emitters. For a valid pulse, PRI parameters are measured. A pulse pattern count is incremented and checked to determine if a track is acquired for the emitter.
대표청구항▼
1. A method, comprising: (a) receiving a first pulse train from an emitter;(b) measuring pulse repetition interval parameters of the first pulse train;(c) receiving a further pulse train;(d) measuring pulse repetition interval parameters of the further pulse train;(e) incrementing, using a computer
1. A method, comprising: (a) receiving a first pulse train from an emitter;(b) measuring pulse repetition interval parameters of the first pulse train;(c) receiving a further pulse train;(d) measuring pulse repetition interval parameters of the further pulse train;(e) incrementing, using a computer processor, a check pattern count based upon whether the further pulse train has a jitter error less than a jitter threshold, wherein the jitter error corresponds to a difference between the pulse repetition interval characteristics of the further pulse train and pulse repetition interval parameters of a prior pulse train;(f) comparing the check pattern count to a track threshold;(g) determining whether a track for the emitter has been acquired based upon the check pattern comparison; and(h) repeating steps (c) to (f). 2. The method according to claim 1, wherein the parameters include pulse width, amplitude, and frequency. 3. The method according to claim 1, further including performing repetition interval parameter filtering on pulse descriptor words (PDWs) generated from the first and/or further pulse train. 4. The method according to claim 3, further including performing repetition interval parameter filtering on center frequency, pulse width, PRI, amplitude, and/or intra-pulse modulation. 5. The method according to claim 4, further including determining whether the center frequency of a first one of the PDWs is above a low threshold value and below a high threshold value. 6. The method according to claim 1, further including determining an anticipated time of arrival for the further pulse train. 7. The method according to claim 6, further including determining the anticipated time of arrival for the further pulse train from a current anticipated time of arrival and a next pulse repetition interval. 8. The method according to claim 1, further including dropping the emitter track if the detected pattern is no longer detected for a selected amount of time. 9. The method according to claim 1, further including acquiring the emitter track without writes to memory. 10. A system, comprising: a tracker module having a processor and a memory configured to:(a) receive a first pulse train from an emitter;(b) measure pulse repetition interval parameters of the first pulse train;(c) receive a further pulse train;(d) measure pulse repetition interval parameters of the further pulse train;(e) increment a check pattern count based upon whether the further pulse train has a jitter error less than a jitter threshold, wherein the jitter error corresponds to a difference between the pulse repetition interval parameters of the further pulse train and pulse repetition interval parameters of a prior pulse train;(f) compare the check pattern count to a track threshold;(g) determine whether a track for the emitter has been acquired based upon the check pattern comparison; and(h) repeat (c) to (g). 11. The system according to claim 10, wherein the parameters include pulse width, amplitude, and frequency. 12. The system according to claim 10, wherein the tracker module is further configured to perform repetition interval parameter filtering on pulse descriptor words (PDWs) generated from the first and/or further pulse train. 13. The system according to claim 12, wherein the tracker module is further configured to perform repetition interval parameter filtering on center frequency, pulse width, PRI, amplitude, and/or intra-pulse modulation. 14. The system according to claim 13, wherein the tracker module is further configured to determine whether the center frequency of a first one of the PDWs is above a low threshold value and below a high threshold value. 15. The system according to claim 10, wherein the tracker module is further configured to determine an anticipated time of arrival for the further pulse train. 16. The system according to claim 15, wherein the tracker module is further configured to determine the anticipated time of arrival for the further pulse train from a current anticipated time of arrival and a next pulse repetition interval. 17. The system according to claim 10, wherein the tracker module is further configured to drop the emitter track if the detected pattern is no longer detected for a selected amount of time. 18. A method, comprising: (a) receiving a first PRI value for a pulse train received by an antenna;(b) measuring the first PRI value as variable PRI measured, initializing a variable pattern, and initializing a variable true check;(c) storing the first PRI value in a first slot of a PRI table;(d) incrementing the variable pattern and incrementing the variable checks;(e) measuring a next PRI value that becomes a new value for the variable PRI measured;(f) incrementing the value of variable checks if the value stored in the PRI table minus the value for PRI measured is less than or equal to a jitter error;(g) incrementing the variable pattern if the value of PRI table minus PRI measured is greater than a jitter error, storing the new PRI measured value into a next index of the PRI table;(h) establishing that track has been acquired with a pattern level corresponding to the PRIs contained in the PRI table if the value of true checks equals a value of corresponding to the variable pattern;(i) performing step (b) if the value for pattern is great than a value for max pattern;(j) performing step (e) if the value for pattern is less than or equal to the value for max pattern. 19. The method according to claim 1, further comprising incrementing, using a computer processor, a pattern count when the jitter error of the further pulse train is equal to or greater than the jitter threshold. 20. The method according to claim 19, wherein the track threshold is determined using the pattern count.
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이 특허에 인용된 특허 (11)
Overman Thelma L. (Millers MD) Overman Kelly C. (Millers MD), Adaptive radar threat detection and tracker verification system.
Wang, Paul C.; Orr, Matthew; Sparrow, Mitchell; Apa, Martin, System and method for detecting and de-interleaving radar emitters using snapshots of varying lengths.
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