METHOD TO IMPROVE SATELLITE SIGNAL DETECTION
First Claim
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1. A method of acquiring a satellite signal in a GNSS receiver, the method comprising:
- multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal;
multiplying a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal;
multiplying a windowing function signal with the PN wiped signal to generate a windowed signal; and
integrating, coherently, the windowed signal for a first predefined time to generate a coherent accumulated data.
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Abstract
A method of acquiring a satellite signal in a GNSS receiver includes multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal. A PN code sequence signal is multiplied with the frequency shifted signal to generate a PN wiped signal. A windowing function signal is multiplied with the PN wiped signal to generate a windowed signal. The windowed signal is integrated coherently for a first predefined time to generate a coherent accumulated data.
7 Citations
21 Claims
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1. A method of acquiring a satellite signal in a GNSS receiver, the method comprising:
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multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; multiplying a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; multiplying a windowing function signal with the PN wiped signal to generate a windowed signal; and integrating, coherently, the windowed signal for a first predefined time to generate a coherent accumulated data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of acquiring a satellite signal in a GNSS receiver, the method comprising:
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multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; multiplying a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; multiplying the PN wiped signal with a plurality of delayed windowing function signals to generate a plurality of windowed signals; and integrating, coherently, the plurality of windowed signals for a first predefined time to generate a plurality of coherent accumulated data. - View Dependent Claims (9, 10, 11)
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12. A method of acquiring a satellite signal in a GNSS receiver, the method comprising:
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multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; multiplying a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; delaying the PN wiped signal by a predefined time periods to generate a plurality of delayed PN wiped signals; multiplying a windowing function signal with the plurality of delayed PN wiped signals to generate a plurality of windowed signals; and integrating, coherently, the plurality of windowed signals for a first predefined time to generate a plurality of coherent accumulated data. - View Dependent Claims (13, 14)
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15. A global navigation satellite system (GNSS) receiver comprising:
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a doppler multiplication module configured to multiply a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; a PN multiplication module configured to multiply a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; a window multiplication module configured to multiply a windowing function signal with the PN wiped signal to generate a windowed signal; and a coherent integrator configured to integrate the windowed signal for a first predefined time to generate coherent accumulated data. - View Dependent Claims (16, 17)
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18. A global navigation satellite system (GNSS) receiver comprising:
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a doppler multiplication module configured to multiply a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; a PN multiplication module configured to multiply a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; a plurality of window multiplication modules configured to multiply the PN wiped signal with a plurality of delayed windowing function signals to generate a plurality of windowed signals; and a plurality of coherent integrator configured to integrate coherently the plurality of windowed signals for a first predefined time to generate a plurality of coherent accumulated data. - View Dependent Claims (19, 20)
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21. A global navigation satellite system (GNSS) receiver comprising:
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a doppler multiplication module configured to multiply a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal; a PN multiplication module configured to multiply a PN code sequence signal with the frequency shifted signal to generate a PN wiped signal; a plurality of delay modules configured to delay the PN wiped signal by predefined time periods to generate a plurality of delayed PN wiped signals; a plurality of window multiplication modules to multiply the plurality of delayed PN wiped signals with a windowing function signal to generate a plurality of windowed signals; a plurality of coherent integrators configured to integrate coherently the plurality of windowed signals for a first predefined time to generate a plurality of coherent accumulated data; and a non-coherent integrator configured to integrate non-coherently the plurality of coherent accumulated data.
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Specification