[특허]Diversity type global positioning system for motor vehicles

Diversity type global positioning system for motor vehicles 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/08 G01S-005/02
출원번호	US-0812102 (1991-12-23)
우선권정보	JP-0407959 (1990-12-27)
발명자 / 주소	Shirai Kazunari (Obu JPX) Ozaki Yoshitaka (Anjo JPX) Fukaya Hiroyasu (Nagoya JPX)
출원인 / 주소	Nippondenso Co., Ltd. (Kariya JPX 03)
인용정보	피인용 횟수 : 49 인용 특허 : 0

초록 ▼

This diversity type GPS system for a vehicle has first and second antennas mounted at first and second locations, respectively, inside a vehicle. First and second high frequency amplifiers and an antenna changer apply the signals received by the first and second antennas to first and second SS demodulators. The first and second SS demodulators simultaneously perform search operations for satellites, and demodulate rf signals (demodulated data) from the searched out satellites. An arithmetic and control unit computes a position of the vehicle from the demodulated data once three or more sets of demodulated data are available. The arithmetic and control unit also controls the antenna changer to switch the antenna from which a demodulator receives signals so as to improve the searching operations of the demodulators.

대표청구항 ▼

A diversity type GPS for a vehicle for computing a position of the vehicle on the basis of rf signals received from a plurality of satellites, comprising: first and second antennas, mounted at first and second discrete positions, respectively, in a compartment of a vehicle, for receiving rf signals from a plurality of satellites, and signal receiving means for demodulating rf signals from said satellites on the basis of signals received from said first and second antennas, and for computing a position of said vehicle on the basis of the demodulated data, said signal receiving means comprising: first and second demodulators, each for receiving a search command for a specific satellite, for performing a satellite search operation in accordance with said signals received by a selected one of said first and second antennas, and for demodulating said received signals when said satellite search operation is effected, first switching means for selectively inputting signals received from said first and second antennas to said first demodulator, second switching means for selectively inputting signals received from said first and second antennas to said second demodulator, control means for outputting said search command for a first satellite to said first demodulator, for outputting a first antenna selection command for selection of either said first or second antenna to said first switching means, for outputting said search command for a second satellite to said second demodulator, and for outputting a second antenna selection command for selection of either said first or second antenna to said second switching means, and computing means for computingthe position of said vehicle, wherein said first and second demodulators simultaneously search out said first and second satellites.

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