Method and apparatus for performing frequency synchronization
First Claim
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1. A method comprising:
- forming, using a processing device, a correlation signal comprising a sequence of correlation values from a plurality of correlations performed over a period less than a repeating period of a code;
determining, over a plurality of possible frequencies and using the processing device, a plurality of estimates of a signal magnitude of the correlation signal or a plurality of estimates of a signal power of the correlation signal;
estimating, based on the estimates of the signal magnitude or the estimates of the signal power and using the processing device, a frequency that is used to receive a signal comprising the code, wherein the frequency corresponds to a maximum signal magnitude in the estimates of the signal magnitude of the correlation signal or a maximum signal power in the estimates of the signal power of the correlation signal.
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Abstract
A method and apparatus for performing frequency analysis of sub-epoch correlations to estimate an unknown frequency of a received signal is provided. The method includes forming a sequence of correlation values from a plurality of correlations performed over a period less than a repeating period of a code, and analyzing the sequence of correlation values to estimate the frequency that is used to receive a signal comprising the code.
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Citations
19 Claims
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1. A method comprising:
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forming, using a processing device, a correlation signal comprising a sequence of correlation values from a plurality of correlations performed over a period less than a repeating period of a code; determining, over a plurality of possible frequencies and using the processing device, a plurality of estimates of a signal magnitude of the correlation signal or a plurality of estimates of a signal power of the correlation signal; estimating, based on the estimates of the signal magnitude or the estimates of the signal power and using the processing device, a frequency that is used to receive a signal comprising the code, wherein the frequency corresponds to a maximum signal magnitude in the estimates of the signal magnitude of the correlation signal or a maximum signal power in the estimates of the signal power of the correlation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 19)
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9. An apparatus comprising:
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a memory configured to store a sequence of correlation values produced over a period less than a repeating period of a code; and a processor configured to; determine, over a plurality of possible frequencies, a plurality of estimates of a signal magnitude of a correlation signal comprising the correlation values or a plurality of estimates of a signal power of the correlation signal, and estimate, based on the estimates of the signal magnitude or the estimates of the signal power, a frequency that is used to receive a signal comprising the code, wherein the frequency corresponds to a maximum signal magnitude in the estimates of the signal magnitude of the correlation signal or a maximum signal power in the estimates of the signal power of the correlation signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A Global Navigation Satellite System (GNSS) receiver comprising:
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a tuner comprising a numerically controlled oscillator configured to adjust an intermediate frequency; a GNSS signal convolution processor, coupled to the tuner, configured to produce a sequence of correlation, values, where the sequence of correlation values are produced over a period less than a repeating period of a code; a correlation history memory, coupled to the convolution processor, configured to store the sequence of correlation values; and a processor coupled to the correlation history memory, wherein the processor is configured to; determine, over a plurality of possible frequencies, a plurality of estimates of a signal magnitude of a, correlation signal comprising the correlation values or a plurality of estimates of a signal power of the correlation signal, and estimate, based on the estimates of the signal magnitude or the estimates of the signal power, a frequency of the numerically controlled oscillator, wherein the frequency corresponds to a maximum signal magnitude in the estimates of the signal magnitude of the correlation signal or a maximum signal power in the estimates of the signal power of the correlation signal. - View Dependent Claims (18)
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Specification