Method of despreading GPS signals
First Claim
1. A method of despreading first and second GPS spread spectrum signals received by a GPS receiver comprising the steps of:
- acquiring the first GPS signal;
obtaining frequency information relating to measured variations in the frequency of the first acquired signal as measured by the GPS receiver; and
in the course of a single dwell, using the frequency information to acquire the second GPS signal.
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Accused Products
Abstract
A method of despreading a plurality of GPS spread spectrum signals received by a GPS receiver (24) is disclosed together with a GPS receiver (24) and a mobile communications device (MS1) (especially a mobile cellular telephone) for the same. The method comprises the steps of acquiring a first GPS signal from the stored samples; obtaining frequency information relating to variations in the frequency of the first acquired signal as measured by the GPS receiver; and using the frequency information to acquire a second GPS signal. The frequency information may be used to acquire the second GPS signal in the course of a single dwell and may also, for a digital GPS receiver, relate to variations in the frequency of the first acquired signal present in stored samples.
38 Citations
16 Claims
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1. A method of despreading first and second GPS spread spectrum signals received by a GPS receiver comprising the steps of:
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acquiring the first GPS signal; obtaining frequency information relating to measured variations in the frequency of the first acquired signal as measured by the GPS receiver; and in the course of a single dwell, using the frequency information to acquire the second GPS signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A GPS receiver able to despread a first and second GPS spread spectrum signals received by the GPS receiver, comprising:
a processor which acquires the first GPS signal., obtains frequency information relating to measured variations in the frequency of the first acquired signal as measured by the GPS receiver, and in the course of a single dwell, uses the frequency information to acquire the second GPS signal.
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16. A mobile telephone comprising;
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a GPS receiver able to despread a first and second GPS spread spectrum signals received by the GPS receiver, comprising; a processor which acquires the first GPS signal, obtains frequency information relating to measured variations in the frequency of the first acquired signal as measured by the GPS receiver, and in the course of a single dwell, uses the frequency information to acquire the second GPS signal.
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Specification