Invention Grant
- Patent Title: GPS satellite signal tracking method for GPS receivers
- Patent Title (中): 用于GPS接收机的GPS卫星信号跟踪方法
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Application No.: US578919Application Date: 1990-09-07
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Publication No.: US5059969APublication Date: 1991-10-22
- Inventor: Shozaburo Sakaguchi , Hitoshi Ando
- Applicant: Shozaburo Sakaguchi , Hitoshi Ando
- Applicant Address: JPX Tokyo
- Assignee: Pioneer Electronic Corporation
- Current Assignee: Pioneer Electronic Corporation
- Current Assignee Address: JPX Tokyo
- Priority: JPX1-308884 19891130
- Main IPC: G01S1/00
- IPC: G01S1/00 ; G01S19/28
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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