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US 8,149,900 B2Granted
Low complexity acquisition method for GNSS
AssigneeMediatek Inc.
InventorsDong-hong Liu, Hen-wai Tsao
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Abstract
A low complexity acquisition method and a receiver implemented such a method are disclosed. In the present invention, a cyclical shifted-and-combined (CSC) code is generated by intercepting sub-codes from a full code and combining the sub-codes with an equal gain. The CSC code is correlated with a received signal to find a candidate peak. The other candidate peak(s) can be deduced accordingly. Thus, hypotheses can be significantly reduced. A true peak can be easily and rapidly found by verifying the candidate peaks.
Claims17
An acquisition method for GNSS, the method comprising steps of:
- partially intercepting sections of a full code consisting of code phase shifts to generate a plurality of sub-codes, the respective code phase shifts equally appearing in the overall sub-codes;
- combining the sub-codes to generate a new code;
- correlating the new code with a received signal to obtain a candidate peak;
- deducing other candidate peaks with respect to the obtained candidate peak;
- and
- verifying all of the candidate peaks to find a true peak.
3 more elements
A GNSS receiver comprising:
- a code generator for generating a full code;
- a cyclic shifted-and-combined (CSC) code generator receiving the full code, partially intercepting sections of a full code consisting of code phase shifts to generate a plurality of sub-codes and combining the sub-codes to generate a CSC code, the respective code phase shifts equally appearing in the overall sub-codes;
- a correlation unit for correlating the CSC code with a received signal;
- and
- a decision unit for determining a candidate peak according to correlation results of the CSC code with the received signal to deduce other candidate peaks with respect to the obtained candidate peak and verifying all of the candidate peaks to find a true peak.
2 more elements
Dependencies are inferred from the claim text.