Digital front end in system simultaneously receiving GPS and GLONASS signals
First Claim
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1. A receiver for receiving global positioning system (GPS) signals and global navigation satellite system (GLONASS) signals, the receiver comprising:
- an analog front end (AFE);
a GPS digital front end (DFE) and a GLONASS DFE for receiving an output signal of the AFE;
a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs; and
search engines for receiving outputs of the DMI,wherein front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals,wherein the GPS DFE includes;
a low pass filter (LPF) for filtering and decimating the output signal of the AFE; and
a multiplexer for selecting one of the output signal of the AFE and an output signal of the LPF.
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Abstract
A receiver for receiving both GPS signals and GLONASS signals is provided. This receiver includes an analog front end (AFE), a GPS digital front end (DFE) and a GLONASS DFE for receiving an output of the AFE, and a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs. Search engines are provided for receiving outputs of the DMI. Notably, certain front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals.
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Citations
35 Claims
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1. A receiver for receiving global positioning system (GPS) signals and global navigation satellite system (GLONASS) signals, the receiver comprising:
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an analog front end (AFE); a GPS digital front end (DFE) and a GLONASS DFE for receiving an output signal of the AFE; a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs; and search engines for receiving outputs of the DMI, wherein front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals, wherein the GPS DFE includes; a low pass filter (LPF) for filtering and decimating the output signal of the AFE; and a multiplexer for selecting one of the output signal of the AFE and an output signal of the LPF. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A receiver for receiving global positioning system (GPS) signals and global navigation satellite system (GLONASS) signals, the receiver comprising:
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an analog front end (AFE); a GPS digital front end (DFE) and a GLONASS DFE for receiving an output of the AFE; a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs; and search engines for receiving outputs of the DMI, wherein front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals, wherein the GLONASS DFE includes at least one spur estimation cancellation (SEC) block for cancelling a known spur frequency, wherein each SEC block includes a numerically-controlled oscillator (NCO) for generating a phase of a spur based on a sample, the sample being a spur frequency/analog-to-digital converter (ADC) frequency. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification