SATELLITE SEARCH METHOD AND RECEIVER USING THE SAME
First Claim
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1. A satellite search method comprising steps of:
- (a) providing a candidate satellite list containing a plurality of satellites;
(b) calculating mean visibility of at least one satellite listed in the candidate satellite list for positions with respect to a current time;
(c) selecting a satellite from the candidate satellite list according to the mean visibility of each satellite listed in the candidate satellite list;
(d) searching the selected satellite to obtain a search result;
(e) eliminating at least one position from the possible positions according to the search result; and
(f) repeating steps (b) to (e).
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Abstract
A satellite search method and a receiver implementing such a method are disclosed. In the present invention, a predetermined range is sampled into multiple possible positions or space-time points, each of which is defined by a specific position and a time sample. The possible positions or points are sieved according to a search result of a satellite selected from candidate satellites each time. By repeatedly doing so, the finally remaining position will approach a user'"'"'s position, and accordingly the candidate satellites converge to the most possible ones as to facilitate satellite search.
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Citations
20 Claims
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1. A satellite search method comprising steps of:
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(a) providing a candidate satellite list containing a plurality of satellites; (b) calculating mean visibility of at least one satellite listed in the candidate satellite list for positions with respect to a current time; (c) selecting a satellite from the candidate satellite list according to the mean visibility of each satellite listed in the candidate satellite list; (d) searching the selected satellite to obtain a search result; (e) eliminating at least one position from the possible positions according to the search result; and (f) repeating steps (b) to (e). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A receiver for receiving and processing satellite signals to conduct a satellite search, the receiver comprising:
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a correlation block for correlating the satellite signals with a code of a satellite so as to search the satellite; and a navigation processor for controlling the correlation block, wherein the navigation processor provides a candidate satellite list containing a plurality of satellites, calculates mean visibility of at least one satellite listed in the candidate satellite list for possible positions with respect to a current time, instructs the correlation block to search a satellite which is selected according to the mean visibility of each satellite to obtain a search result, and eliminates at least one position from the possible positions according to the search result. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification