[특허]TDOA/FDOA technique for locating a transmitter

TDOA/FDOA technique for locating a transmitter 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-003/16 G01S-005/04 G01S-015/00 G01S-003/80
출원번호	US-0138154 (1993-10-15)
발명자 / 주소	DesJardins Gerard A. (Endicott NY)
출원인 / 주소	Loral Federal Systems Company (McLean VA 02)
인용정보	피인용 횟수 : 83 인용 특허 : 0

초록 ▼

A process for locating a transmitter in which the signal is received by first and second receivers and then processed by respective analog to digital converters and filtered to yield first and second digital signals. There is relative motion between at least one of the receivers and the transmitter. A compression process local to the first receiver compresses the first digital signal. The result of the compression process is transmitted to a cross-correlation unit which is local to the second receiver and coupled also to receive the second digital signal. Locally to the first receiver, correction factors for the solution to the cross-correlation function are determined and transmitted to a correction unit at the second receiver site which applies the correction factors to the solution of the cross-correlation function. The location of the transmitter is determined based on time difference of arrival and frequency difference of arrival results output from the correction unit. If there is no relative motion between the transmitter and any receiver, then three receivers are necessary to locate the transmitter. The outputs are analog to digital converted and filtered to yield first, second and third digital signals. A compression process at the first receiver site compresses the first digital signal. The compressed signal data is transmitted to convolution units local to the second and third receivers and convolved with the second and third digital signals, respectively. Then correction factors for both convolution units are determined local to the first receiver and transmitted to correction units at both the second and third receiver sites. The location of the transmitter is then determined based on two time difference of arrival results.

대표청구항 ▼

A process for locating a transmitter, said process comprising the steps of: receiving at a first receiver a signal transmitted by said transmitter; analog to digital converting the signal received by said first receiver to yield a first digital signal; compressing the first digital signal or another digital signal derived from said first digital signal; receiving at a second receiver the signal transmitted by said transmitter, wherein there is relative motion between said first or second receiver and said transmitter; analog to digital converting the signal received by said second receiver to yield a second digital signal; transmitting the compressed signal to a cross-correlation unit local to said second receiver and coupled also to receive said second digital signal or another digital signal derived from said second digital signal; using said cross-correlation unit to generate and solve a cross-correlation function based on said compressed signal and said second digital signal or other digital signal derived from said second digital signal; and determining, locally to said first receiver, correction factors for the solution to the cross-correlation function, and transmitting said correction factors to a correction unit which applies said correction factors to the solution of said cross-correlation function.

이 특허를 인용한 특허 (83)

Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul; Ginter, Thomas Stephan; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

TDOA/FDOA technique for locating a transmitter 원문보기

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연합인증

TDOA/FDOA technique for locating a transmitter 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (83)

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