Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1993-03-05
1994-06-21
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
455 121, H04B 7185, G01S 502
Patent
active
053231643
ABSTRACT:
A satellite radio wave capturing method of a GPS receiver, in which an offset value of an oscillator of the GPS receiver is calculated by subtracting a Doppler frequency deviation of the first captured satellite radio wave from an actual received frequency of the first captured satellite radio wave, and with respect to the second and subsequent satellite radio waves to be captured, the search center frequencies are reset by using the calculated offset value, and an oscillating frequency of the oscillator is changed by using the set search center frequency as a reference, thereby capturing the radio wave of the target satellite. The elapsed time which is required from the power-OFF at the preceding position measurement by the GPS receiver to the power-ON at the present position measurement is measured. In accordance with the duration of the measured elapsed time, a determination is made to see whether or not the offset value of the oscillator which has been obtained at the preceding position measurement and stored in a memory in the GPS receiver is used as an offset value of the oscillator at the present position measurement. The mean value of a plurality of offset values obtained within a predetermined time just after the power-ON of the GPS receiver is calculated and stored. At the next power-ON of the receiver, the stored mean value of the offset values is used as an initial offset value at the start of the position measurement.
REFERENCES:
patent: 5081462 (1992-01-01), Tachita et al.
patent: 5119101 (1992-06-01), Barnard
patent: 5177490 (1993-01-01), Ando et al.
Patent Abstracts of Japan, vol. 016, No. 136 (P-133) Jul. 4, 1992.
Blum Theodore M.
Pioneer Electronic Corporation
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