Cold start satellite search method
First Claim
1. A method for searching a plurality of satellites in a Global Navigation Satellite System (GNSS), the method applied in a cold start state, said method comprising steps of:
- searching a previous satellite; and
selecting a next satellite to be searched based on the searching result for the previous satellite and interrelationships between the previous satellite and the other satellites.
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Abstract
A method for searching satellites in a cold start state. The method of the present invention, a first satellite, which is predetermined or randomly selected, is searched. Then, a second satellite to be searched is selected according to the searching result (hit or missed) for the first satellite and respective interrelationships between the first satellite and the other satellites. In practice, an initial weight factor table is provided. Depending on the searching result, the initial weight factor table is updated according to the interrelationships between the satellites during searching. By using the method of the present invention, the time-to-first-fix (TTFF) can be reduced to a shorter period of time so as to provide a rapid cold start satellite positioning.
30 Citations
27 Claims
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1. A method for searching a plurality of satellites in a Global Navigation Satellite System (GNSS), the method applied in a cold start state, said method comprising steps of:
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searching a previous satellite; and
selecting a next satellite to be searched based on the searching result for the previous satellite and interrelationships between the previous satellite and the other satellites. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for searching a plurality of satellites in a Global Navigation Satellite System (GNSS), said method comprising steps of:
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searching a first satellite of a candidate satellite list;
updating initial weight factors for satellites based on the searching result for the first satellite;
selecting a second satellite according to the updated weight factors;
searching the second satellite; and
updating weight factors of satellites based on the searching result for the second satellite. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification