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GPS (Global Position System) bit synchronization method based on frequency compensation

A technology of frequency compensation and bit synchronization, applied in the field of navigation and positioning, can solve problems such as complex calculations and unusable Viterbi algorithms

Active Publication Date: 2014-08-06
NANJING LOW POWER IC TECH INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the calculation is too complicated, and the Viterbi algorithm cannot be used in the presence of frequency errors

Method used

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  • GPS (Global Position System) bit synchronization method based on frequency compensation
  • GPS (Global Position System) bit synchronization method based on frequency compensation
  • GPS (Global Position System) bit synchronization method based on frequency compensation

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Embodiment Construction

[0014] The specific implementation of the method for synchronizing GPS signal bits based on frequency compensation in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] see figure 1 , figure 1 It is a schematic flow diagram of realizing GPS signal bit synchronization in the present invention, that is, a schematic flow diagram of GPS receiver realizing navigation message data bit synchronization, and is described in detail as follows.

[0016] The GPS receiver receives the satellite signal, and then can roughly calculate the carrier-to-noise ratio of the signal according to the received signal. Compare the obtained signal carrier-to-noise ratio with the preset threshold of 26dB-Hz. When the received satellite signal carrier-to-noise ratio is greater than this threshold, it means that the received signal power is relatively strong, and the value of N is 1. And when the carrier-to-noise ratio of the received satellite...

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Abstract

The invention discloses a bit synchronization method of a GPS (Global Position System) satellite navigation signal. The method comprises the following steps: calculating the carrier-to-noise ratio of the received satellite navigation signal, determining the number of incoherence times and acquiring twenty groups of continuous data at a time interval of 1ms; then generating frequency compensations different in frequency stepping, performing frequency compensation on each group of data, and solving the envelope of a compensated signal to find out a maximum value in each group of data; repeating the operations according to the number of incoherence times; finally judging the location of the maximum value at twenty possible boundaries so as to determine the location of a true bit boundary. By virtue of the method, big synchronization still can be performed correctly when a frequency error occurs in a tracking loop of a receiver, the reliability of big synchronization is guaranteed and the method has high commercial value.

Description

technical field [0001] The invention belongs to the technical field of navigation and positioning, and in particular relates to a method of using frequency compensation to realize bit synchronization of GPS signals. Background technique [0002] GPS (Global Satellite Positioning System) is a system that uses GPS positioning satellites to perform real-time positioning and navigation around the world. After the receiver finishes capturing and tracking the GPS signal, it needs to synchronize the signal bit. Bit synchronization is the prerequisite for realizing frame synchronization and long-time coherent integration. After realizing frame synchronization, the GPS receiver can demodulate the navigation message on the satellite signal, and then realize the positioning. In a weak signal environment, increasing the coherent integration time to improve tracking sensitivity is the main means for the receiver to keep signal tracking. Bit synchronization is one of the problems that ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 刘新宁牛玉祥谢震戴晨蔡伟瞿晓
Owner NANJING LOW POWER IC TECH INST CO LTD