GPS receiver
First Claim
1. A GPS receiver comprising:
- pseudonoise generator means for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites;
oscillator means for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves; and
a plurality of demodulator means responsive to said regenerated carrier waves and said pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites;
each demodulator means being operative, during demodulation, to detect a set of phases of one pseudonoise signal and one regenerated carrier wave relative to one satellite electromagnetic wave on time division basis and including a first mixer for mixing of one pseudonoise signal, a second mixer for mixing of one regenerated carrier wave and a filter, whereby a set of phases of one pseudonoise signal and one regenerated carrier wave is changed to another set at timed relationship with transmission of data from individual satellites to measure a phase of one pseudonoise signal relative to one satellite electromagnetic wave, thereby tracking data transmitted from individual satellites on the basis of the measured phase.
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Accused Products
Abstract
A GPS receiver comprising a pseudonoise generator for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites, an oscillator for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves, and a plurality of demodulators responsive to the regenerated carrier waves and the pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites, each demodulator being operative, during demodulation, to detect a set of phases of one pseudonoise signal and one regenerated carrier wave relative to one satellite electromagnetic wave on time division basis and including a first mixer for mixing of one pseudonoise signal, a second mixer for mixing of one regenerated carrier wave and a filter, whereby a set of phases of one pseudonoise signal and one regenerated carrier wave is changed to another set at timed relationship with transmission of data from individual satellites to measure a phase of one pseudonoise signal relative to one satellite electromagnetic wave, thereby tracking data transmitted from individual satellites on the basis of the measured phase.
38 Citations
11 Claims
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1. A GPS receiver comprising:
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pseudonoise generator means for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites; oscillator means for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves; and a plurality of demodulator means responsive to said regenerated carrier waves and said pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites; each demodulator means being operative, during demodulation, to detect a set of phases of one pseudonoise signal and one regenerated carrier wave relative to one satellite electromagnetic wave on time division basis and including a first mixer for mixing of one pseudonoise signal, a second mixer for mixing of one regenerated carrier wave and a filter, whereby a set of phases of one pseudonoise signal and one regenerated carrier wave is changed to another set at timed relationship with transmission of data from individual satellites to measure a phase of one pseudonoise signal relative to one satellite electromagnetic wave, thereby tracking data transmitted from individual satellites on the basis of the measured phase. - View Dependent Claims (2, 3)
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4. A GPS receiver comprising:
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pseudonoise generator means for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites; oscillator means for simultaneously regenerating carrier waves of the plurality of satellite electric waves; and a plurality of demodulator means responsive to said regenerated carrier waves and said pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites; said receiver further comprising control means for supplying a clock signal of fixed period to said pseudonoise generator means, delivering a phase of pseudonoise code which is quantized and complies the data, calculating a phase of the pseudonoise signal relative to the satellite electromagnetic wave with an accuracy of less than a quantization step of the phase quantization, on the basis of a correlation of an output signal of said demodulator means to the satellite electromagnetic wave, and numerically tracking individual pseudonoise codes specific to individual satellites. - View Dependent Claims (5, 6)
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7. A GPS receiver comprising:
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pseudonoise generator means for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites; oscillator means for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves; and a plurality of demodulator means responsive to said regenerated carrier waves and said pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites; each demodulator being operative, during demodulation, to determine a set of correlations of one pseudonoise signal and one regenerated carrier wave to one satellite electromagnetic wave on time division basis, said receiver further comprising control means for supplying a clock of fixed period to said pseudonoise generator means, delivering a phase of pseudonoise code which is quantized and complies data of the individual satellites, calculating a phase of the pseudonoise signal relative to the satellite electromagnetic wave with an accuracy of less than a quantization step of the phase quantization, on the basis of a result of correlation determined by the demodulator, and numerically tracking individual pseudonoise codes specific to individual satellites. - View Dependent Claims (8, 9, 10, 11)
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Specification