Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1990-09-07
1991-10-22
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342357, 342 98, 342420, G01S 524, G01S 502
Patent
active
050599690
ABSTRACT:
A method for recapturing a satellite at the highest elevation angle as quickly as possible with a GPS receiver having a plurality of receiving channels when a state of receiving satellite signals recovers to normal after having been interrupted by obstacles like a tunnel, wherein a search range of satellite signal receiving frequency is divided into a plurality of frequency bands and each of which is assigned to the plurality of receiving channels in a one-to-one relationship, a search frequency of each receiving channel is changed in step wise for searching a satellite signal simultaneously in the receiving channels, and further, by providing a time difference for a step wise change-over timing of the search frequency between receiving channels, a time required for recapturing the satellite is greatly reduced by increasing a change to lock up one of the receiving channels with the satellite signal receiving frequency, since there are as many chances as a number of receiving channels within one cycle of the step wise search frequency change-over for one receiving channel.
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Ando Hitoshi
Sakaguchi Shozaburo
Pioneer Electronic Corporation
Sotomayor John B.
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