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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

Inactive Publication Date: 2003-11-26
思凯比特兹公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sometimes a conventional GPS receiver can acquire a GPS signal within a few seconds, usually the acquisition time is quite long

Method used

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

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Embodiment Construction

[0032] The present invention relates to improving the acquisition phase of a GPS receiver by using only very short segments of the received GPS signal, preferably 1 millisecond to 1 second, to shorten the time required to acquire the GPS signal. Therefore, the present invention shortens the time required for the receiver to determine the correct carrier frequency and golden code phase. The present invention allows signal acquisition using signal acquisition segments as short as 1 millisecond in duration.

[0033] image 3 Is a schematic diagram of GPS receiver 301 acquiring GPS signals received from one or more GPS satellites that can be used in accordance with the present invention. For clarity, only a single channel is described below, but with appropriate changes to the gold code, the single channel described can be repeated in the simultaneous processing of input signals from all GPS satellites in view, as will be apparent to those skilled in the art . Each channel uses...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30H04B1/7075
Inventor 马克·C·苏立文
Owner 思凯比特兹公司
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