Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference
First Claim
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1. A method of mitigating multipath interference in a digital signal correlator comprising:
- forming values representative of magnitude or power of a correlation response between a digital signal and a pseudorandom reference code;
selecting an earliest peak in the correlation response to compute a time delay.
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Abstract
A method and apparatus for mitigating multipath interference in a digital signal correlator forms values representative of magnitude or power of a correlation response between a digital signal and a pseudorandom reference code. The earliest peak in the correlation response is then selected as the correct peak to compute a time delay.
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Citations
28 Claims
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1. A method of mitigating multipath interference in a digital signal correlator comprising:
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forming values representative of magnitude or power of a correlation response between a digital signal and a pseudorandom reference code;
selecting an earliest peak in the correlation response to compute a time delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A receiver of global positioning system (GPS) signals comprising:
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an RF/IF converter for filtering and frequency translating a received GPS signal to form an IF signal;
an analog-to-digital converter for digitizing the IF signal;
a tuner for removing Doppler shift form the digitized signal and producing an in-phase (I) and a quadrature (Q) signal;
a decimation circuit for subsampling the I and Q signals;
a correlation processor for correlating the subsampled I and Q signals with a C/A reference code to produce values representative of magnitude or power of a correlation response; and
a processor for selecting an earliest peak in the correlation response to compute a time delay. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. An apparatus for mitigating multipath interference in a digital signal correlator comprising:
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means for forming values representative of magnitude or power of a correlation response between a digital signal and a pseudorandom reference code;
means for selecting an earliest peak in the correlation response to compute a time delay. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification