Signal acquisition and reception method for a global positioning system signal
First Claim
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1. A signal acquisition method for a GPS receiver, comprising the steps of:
- searching, upon starting of acquisition of a GPS satellite after the power source to said GPS receiver is turned on, for a code phase of a signal in a range of all code phases for one period of the code, by using a matched filter; and
continuing said searching for all GPS satellites, which may possibly be disposed, as objects for searching without calculating tracks of the satellites until a signal of at least one of the GPS satellites is acquired.
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Abstract
A signal acquisition method for a GPS receiver which eliminates the necessity of a clock circuit for keeping the current time and also a backup battery for memory is disclosed. According to the signal acquisition method, upon starting of acquisition of a GPS satellite after the power source to the GPS receiver is turned on, using a matched filter, an acquisition operation is performed for objects of all of GPS satellites which may possibly be disposed until after a signal of at least one of the GPS satellites is acquired.
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Citations
11 Claims
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1. A signal acquisition method for a GPS receiver, comprising the steps of:
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searching, upon starting of acquisition of a GPS satellite after the power source to said GPS receiver is turned on, for a code phase of a signal in a range of all code phases for one period of the code, by using a matched filter; and continuing said searching for all GPS satellites, which may possibly be disposed, as objects for searching without calculating tracks of the satellites until a signal of at least one of the GPS satellites is acquired.
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2. A GPS receiver circuit for a GPS receiver, comprising:
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a radio frequency circuit for producing an intermediate frequency signal from a signal being received from a GPS satellite; a code search circuit including a matched filter operable when the power source to said GPS receiver is turned on to initiate acquisition of a signal of a GPS receiver and being capable of searching for a code phase of said intermediate frequency signal in a range of all code phases for one period of the code; means for accurately determining the phase of the code by performing a phase search of the signal from the GPS satellite acquired by said code search circuit; and means for performing a synchronous tracking operation for the signal from the GPS satellite. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification