Method for setting search band widths of a GPS receiver

Details Method for setting search band widths of a GPS receiver Method for setting search band widths of a GPS receiver

1993-03-04

1995-04-18

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342100, 342199, H04B 7185, G01S 1300

Patent

active

054082390

ABSTRACT:
In a GPS receiver which searches for a satellite radio wave over a predetermined search bandwidth while setting a search center frequency f.sub.s to a start point, an offset value of .DELTA.f.sub.osc of an oscillator calculated last when a power source of the receiver is turned off upon completion of the position measurement is stored as a backup value into a memory. When the power source of the receiver is turned on at the next position measurement, the backup offset value .DELTA.f.sub.osc is read out and an initial search bandwidth W.sub.0 at the start of the position measurement is set in accordance with the magnitude of the offset value. According to another feature, when the offset value of the oscillator calculated during the position measurement exceeds a predetermined reference value, a time point of the calculation is backed up into a memory. If a predetermined reference time has not elasped from the backup time point, at the time point when the power source is turned on for the next position measurement, an initial search bandwidth at the start of the position measurement is set to a wide band.

REFERENCES:
patent: 3893115 (1975-07-01), Linder
patent: 5036329 (1991-07-01), Ando
patent: 5059969 (1991-10-01), Sakaguchi et al.
patent: 5177490 (1993-01-01), Ando et al.
patent: 5185761 (1993-02-01), Kawasaki

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