Method and apparatus for multipath detection
First Claim
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1. A method for multi-path detection, the method comprising:
- receiving, by a positioning device, a satellite signal transmitted from a satellite, the satellite signal carrying a ranging code;
locking an internal code generated by the positioning device to the ranging code;
determining characteristics of correlations between the satellite signal and the internal code with time shifts;
detecting satellite signal deterioration due to a multi-path interference based on the characteristics of the correlations between the satellite signal and the internal code with time shifts;
determining a first parameter that is indicative of a symmetric characteristic of the correlations; and
determining a second parameter that is indicative of a distortion from a correlation characteristic without the multi-path interference.
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Abstract
Aspects of the disclosure provide a method for multi-path interference detection. The method includes receiving, by a positioning device, a satellite signal transmitted from a satellite. The satellite signal carries a ranging code. Further, the method includes locking an internal code generated by the positioning device to the ranging code, determining characteristics of correlations between the satellite signal and the internal code with different time shifts, and detecting satellite signal deterioration due to multi-path interference based on the characteristics of the correlations between the satellite signal and the internal code with different time shifts.
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Citations
18 Claims
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1. A method for multi-path detection, the method comprising:
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receiving, by a positioning device, a satellite signal transmitted from a satellite, the satellite signal carrying a ranging code; locking an internal code generated by the positioning device to the ranging code; determining characteristics of correlations between the satellite signal and the internal code with time shifts; detecting satellite signal deterioration due to a multi-path interference based on the characteristics of the correlations between the satellite signal and the internal code with time shifts; determining a first parameter that is indicative of a symmetric characteristic of the correlations; and determining a second parameter that is indicative of a distortion from a correlation characteristic without the multi-path interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising:
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a receiving circuit configured to receive a satellite signal transmitted from a satellite that carries a ranging code, generate an internal code and lock the internal code to the ranging code; and a multi-path detector configured to determine characteristics of correlations between the satellite signal and the internal code with time shifts, detect satellite signal deterioration due to a multi-path interference based on the characteristics of the correlations between the satellite signal and the internal code with the time shifts, determine a first parameter that is indicative of a symmetric characteristic of the correlations, and determine a second parameter that is indicative of a distortion from a correlation characteristic without the multi-path interference. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable medium storing program instructions for causing a processor to execute operations for positioning, the operations comprising:
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receiving correlations between a satellite signal and an internal code with different time shifts, the internal code being locked to a ranging code carried in the satellite signal; determining characteristics of the correlations between the satellite signal and the internal code with different time shifts; detecting satellite signal deterioration due to a multi-path interference based on the characteristics of the correlations between the satellite signal and the internal code with different time shifts; determining a first parameter that is indicative of a symmetric characteristic of the correlations; and determining a second parameter that is indicative of a distortion from a correlation characteristic without the multi-path interference. - View Dependent Claims (18)
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Specification