Boots – shoes – and leggings
Patent
1991-12-23
1994-08-23
Black, Thomas G.
Boots, shoes, and leggings
342457, 342357, H04B 708, G01S 502
Patent
active
053413016
ABSTRACT:
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.
REFERENCES:
patent: 4719469 (1988-01-01), Beier et al.
patent: 4928107 (1990-05-01), Kuroda et al.
patent: 4983980 (1991-01-01), Ando
patent: 5040240 (1991-08-01), Keegan
patent: 5144318 (1992-09-01), Kishi
patent: 5177493 (1993-01-01), Kawamura
patent: 5185761 (1993-02-01), Kawasaki
Borel et al, "Texas Instruments Phase 1 GPS User Equipment" Global Positioning System, pp. 87-103, 1985.
Fukaya Hiroyasu
Ozaki Yoshitaka
Shirai Kazunari
Black Thomas G.
Nippondenso Co. Ltd.
Zanelli Michael
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