System and method for fast code phase and carrier frequency acquisition in GPS receiver

A GPS receiver and GPS signal technology, applied in the field of GPS positioning system, can solve the problem of long capture time
CN1459154AInactive Publication Date: 2003-11-26思凯比特兹公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
思凯比特兹公司
Publication Date
2003-11-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

A GPS receiver acquires carrier frequency and Gold code phase using short segments of a received GPS signal. In one embodiment, a 1-ms segment of the GPS signal is transformed to the frequency domain. This is multiplied by a frequency representation of the Gold code. The resulting product is converted to the time domain, and a peak is detected. The location of the peak corresponds to the code phase. If no peak is located, the carrier frequency is changed. Full- and half-bin steps in carrier frequency are considered. Processing gain is achieved by using longer segments of the input signal, for example 4 or 16 ms and integrating 1-ms segments. Considerations are provided for compensating for the effects of a transition, should it occur in the short segment of the GPS signal being processed. Integrations can be performed using non-coherent and coherent techniques. Adjustments are made for non-integral millisecond segment lengths.
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Description

[0001] This application is a continuation-in-part of US Patent Application Serial No. 09 / 924,542, filed August 9, 2001, which is hereby incorporated by reference in its entirety. This application also claims the benefit of US Provisional Patent Application No. 60 / 233,446, filed September 18, 2000, which is hereby incorporated by reference in its entirety. technical field

[0002] The present invention mainly relates to GPS positioning system. More particularly, the present invention relates to improved code phase and carrier frequency acquisition in GPS positioning systems. Background technique

[0003] The Global Positioning System (GPS) is used to determine orientation in many applications. For example, in navigation, a user can use a GPS receiver to determine his current orientation and its change over time. Another use of GPS receivers is to track objects. For example, putting a GPS receiver on a truck can track the movement of the truck, and attaching the receiver to t...

Claims

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