GPS satellite signal tracking method for GPS receivers

Details GPS satellite signal tracking method for GPS receivers GPS satellite signal tracking method for GPS receivers

1990-08-28

1991-07-30

Hellner, Mark

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

Directive

Including a satellite

342386, G01S 502

Patent

active

050363298

ABSTRACT:
When reception of satellite signals is lost, for example, one minute, satellite signals are searched firstly in accordance with a narrow-band search mode by varying a search frequency within a range of Doppler frequency shift estimated by a moving speed of a GPS receiver, for example, .+-.600 Hz for a vehicle-mounted GPS receiver, for a duration which is determined by dividing a capture range (.+-.150 Hz) by a rate of Doppler shift (40 Hz/sec) and, secondly, switching over the search mode from the narrow-band search to a wide-band search if recapturing of the satellite signal is failed through the narrow-band search within the predetermined duration (3 minutes 45 seconds) for recapturing the lost satellite signals, and thereby providing a expeditious two-step search method for decreasing a time required in recapturing the lost satellite signals.

REFERENCES:
patent: 4578678 (1986-05-01), Hurd
patent: 4785463 (1988-11-01), Janc et al.

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