Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1990-12-10
1993-01-05
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
H04B 7185, G01S 502
Patent
active
051774909
ABSTRACT:
A satellite signal tracking system for a GPS receiver, wherein a GPS satellite is recaptured within a very short period of time, after the interruption of reception is cleared as by passing through a tunnel and the like, by widening a band width of the PLL search frequency gradually every after repeating the search for the satellite signal, performing a narrow-band search repeatedly as varying its center frequency along the Doppler shift curve, performing a narrow-band search for a specific period of time which is given by dividing the capture range of the PLL circuit by the Doppler shift rate and a wide-band search with use of an estimated satellite signal receiving frequency which is given by recalculating the Doppler frequency of the GPS satellite at the very moment according to the almanac data of the GPS satellite and is assigned as the center frequency, and, still further, performing the search for GPS satellites repeatedly with the estimated satellite signal receiving frequency in the center for recovering the function to perform the positional reckoning which is the primary function of the GPS receiver.
REFERENCES:
patent: 4426712 (1984-01-01), Gorski-Popiel
patent: 5036329 (1991-07-01), Ando
Patent Abstracts of Japan, vol. 10, No. 188 (P-473) 2244) Jul. 3, 1986 & JP-A-61 034 486.
European Patent Office Search Report.
Adachi Masaya
Ando Hitoshi
Sakaguchi Shozaburo
Shibata Jun'ichi
Yoshida Hayato
Blum Theodore M.
Pioneer Electronic Corporation
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