Global orbiting navigation satellite system receiver
First Claim
1. A global orbiting navigation satellite system (GLONASS) navigation receiver, comprising:
- a radio frequency (RF) down-conversion section having a RF input to receive microwave radio transmissions from orbiting GLONASS satellites and a pseudo-baseband output in which a plurality of GLONASS satellite carriers separated in frequency are mixed-down to a near baseband composite signal that exhibits a spectral fold-over;
a Nyquist sampling unit included in a final stage of the RF down-conversion section and operating in the range of twenty to twenty-five MHz for generating in-phase (I) and quadrature-phase (Q) signals from said composite signal; and
a digital carrier mixer connected to receive said I and Q signals and having a programmable frequency that provides for a digital baseband selection among particular GLONASS satellites.
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Accused Products
Abstract
A receiver embodiment of the present invention comprises a radio frequency section that down-converts frequency division signals received from the several orbiting GLONASS satellites into a composite pseudo-baseband with spectral fold-over, a Nyquist sampling unit for sampling the composite signal at twenty to twenty-five MHz, and a programmable carrier frequency in-phase (I) and quadrature-phase (Q) digital multiplier for sorting through the composite signal to find a particular GLONASS satellite'"'"'s signal. The particular satellite is identified by comparing almanac and ephemeris information. Cross-correlations between L1 and L2 are performed by a correlation that is integrated over a whole data bit length and a proposed insertion bit is inverted or not inverted according to its sign before further summing.
48 Citations
8 Claims
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1. A global orbiting navigation satellite system (GLONASS) navigation receiver, comprising:
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a radio frequency (RF) down-conversion section having a RF input to receive microwave radio transmissions from orbiting GLONASS satellites and a pseudo-baseband output in which a plurality of GLONASS satellite carriers separated in frequency are mixed-down to a near baseband composite signal that exhibits a spectral fold-over; a Nyquist sampling unit included in a final stage of the RF down-conversion section and operating in the range of twenty to twenty-five MHz for generating in-phase (I) and quadrature-phase (Q) signals from said composite signal; and a digital carrier mixer connected to receive said I and Q signals and having a programmable frequency that provides for a digital baseband selection among particular GLONASS satellites. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification