[특허]Enhanced position calculation

[미국특허] Enhanced position calculation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-003/02
출원번호	US-0941367 (1997-09-30)
발명자 / 주소	Sanderford H. Britton Poppe Martin C.
출원인 / 주소	Sanconix Inc.
대리인 / 주소	Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
인용정보	피인용 횟수 : 121 인용 특허 : 0

초록 ▼

The invention discloses several computation and control techniques which use historic information as well as other cues in order to enhance the accuracy of a radio position fix. These computational techniques include neural networks, mapped grid coefficients as input to a set of simultaneous or differential equations,and table lookup of correction coefficients for known low accuracy positions. The invention further discloses techniques for receiver array synchronization so that all system elements in a particular coverage area obtain a time reference appropriate for time of flight radio location measurements. The invention further teaches techniques to enhance the accuracy of a position fix by use of both fixed references, which are located in a coverage area, as well as a mobile reference carried by a search team. The invention also discloses techniques to provide information appropriate to guide a search team to an unknown positioned transmitter that is located within a building or structure. The invention discloses techniques to train a central computing unit, by using actuarial data, so that multi-path errors resulting from fixed or mobile obstacles may be reduced.

대표청구항 ▼

[ What is claimed as new and desired to be secured by Letters: Patent of the United States is:] [1.] A method for correcting clock drift of a time base of a radio receiver via a time reference signal transmission, in order to determine with increased accuracy, a location from which an unknown position radio signal is transmitted, comprising the steps of:transmitting a time reference signal;receiving said time reference signal at first and second radio receivers;resetting first and second counters at said first and second receivers at predetermined intervals based on said time reference signal, each of said counters containing a value and receiving a clocking signal;correcting a time base at said first and second radio receivers using the received time reference signal to correct for said clock drift;incrementing each of said counters using the respective time base of the respective radio receiver as a clocking signal;receiving an unknown position radio signal at said first and second receivers;capturing the respective values of the counters when said unknown position radio signals are received;communicating the captured values to a neural network;using the captured values as an uncorrected timing indicator signal between the respective time reference signals and the unknown position radio signal;inputting the uncorrected timing indicator signal to the neural network; andoutputting from the neural network a drift corrected timing indicator signal based on the captured values and the uncorrected timing indicator signal and based upon past training of the neural network.

이 특허를 인용한 특허 (121) 인용/피인용 타임라인 분석

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