The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2011
Filed:
May. 17, 2006
Zhike Jia, San Jose, CA (US);
Zhike Jia, San Jose, CA (US);
SIRF Technology Holdings, Inc., San Jose, CA (US);
Abstract
The present invention provides an elevation based adaptive scheme for setting power threshold in the acquisition of navigational satellite signals. In an embodiment, the elevation based adaptive scheme uses a different series of power thresholds to acquire signals from satellites at different elevation angles instead of using one threshold for all satellites, as is done in the prior art. This scheme exploits the fact that the received signal power level depends on the elevation angle of the satellite at the receiver. This scheme also takes into account the antenna gain variation without having to measure the antenna gain variation.