Invention Grant
- Patent Title: False reacquisition mitigation in high sensitivity navigational satellite signal receivers
- Patent Title (中): 高灵敏度导航卫星信号接收机中的虚拟反馈缓解
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Application No.: US11274054Application Date: 2005-11-14
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Publication No.: US07479924B2Publication Date: 2009-01-20
- Inventor: Zhike Jia , Shridhara A. Kudrethaya , Chi-Shin Wang
- Applicant: Zhike Jia , Shridhara A. Kudrethaya , Chi-Shin Wang
- Applicant Address: US CA San Jose
- Assignee: SiRF Technology Holdings, Inc.
- Current Assignee: SiRF Technology Holdings, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Pillsbury Winthrop Shaw Pittman LLP
- Main IPC: G01S1/00
- IPC: G01S1/00 ; H04B1/00

Abstract:
The techniques to detect and mitigate the false reacquisition in a global satellite navigation receiver are disclosed. The false reacquisition due to frequency side-lobes and code autocorrelation secondary lobes are considered for mitigation. A set of two threshold values is used to detect correct reacquisition and reject false reacquisition. While the reacquisition of the signal is straight forward when the correlation is clear with the power above the first threshold, it is not so clear when the power is between two thresholds. So a further search for the maximum power among the retained dwells results in correct reacquisition. The search range depends upon the signal blockage interval and receiver dynamics. The feedback from navigational solution may be used to determine the search range both in frequency and code phase. In the case of frequency side-lobes, which occur only at specified frequency components, these frequencies are tested for maximum power response. The code side-lobes have similar characteristics and can be distinguished by the actual peak.
Public/Granted literature
- US20070109189A1 False reacquisition mitigation in high sensitivity navigational satellite signal receivers Public/Granted day:2007-05-17
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