GNSS signal self-adaption quick traction method

An adaptive and signal technology, applied in the field of satellite positioning and navigation communication, can solve the problems of reduced first positioning time, lack of bit synchronization verification mechanism, waste of resources, etc., and achieve the effect of reducing the probability of bit synchronization errors

Active Publication Date: 2013-09-25
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] There are following deficiencies in this traditional scheme: 1, fixed pulling time and bit synchronous time, cause average pulling time long, be unfavorable for the reduction of time to first fix (TTFF)
2. Taking the captured rough carrier frequency as the initial value, there is a risk that the loop cannot be successfully closed when the frequency estimate is too rough
3. There is a lack of bit synchronization verification mechanism. If the bit synchronization is wrong, it will ...

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  • GNSS signal self-adaption quick traction method
  • GNSS signal self-adaption quick traction method

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Embodiment Construction

[0017] The GNSS baseband chip is a chip for processing baseband signals in the GNSS receiver, and is the core of the entire GNSS receiver. A GNSS signal adaptive fast traction method provided by this application is implemented in the GNSS baseband chip. The following briefly introduces the GNSS receiver. For the sake of convenience, "receiver" in this application refers to "GNSS baseband chip".

[0018] figure 1 The illustrated embodiment depicts a block diagram of a typical GNSS receiver. This is a complete GNSS receiver, including an antenna 101 , a radio frequency front-end chip 102 , and a baseband processing chip 103 . The baseband processing part consists of several correlation channels 104 (including correlation channel 1 1041 , correlation channel 2 1042 , and correlation channel N 1043 ), acquisition processing 105 , tracking processing 106 and positioning solution processing 107 . The baseband processing part 103 receives digital intermediate frequency sampling dat...

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Abstract

The invention discloses a GNSS signal self-adaption quick traction method. The GNSS signal self-adaption quick traction method comprises the method that carrier frequency, phase tracking, pseudo code phase tracking and bit synchronization are conducted according to the state of traction enable signals; when the time of bit synchronization reaches a preset value, a bit synchronization frequency counter is adjusted, and the position of a maximum value and the position of a minimum value can be searched in an energy column diagram; bit synchronization and traction are judged whether to be failed or not according to the position of the maximum value, the position of the minimum value and the bit synchronization frequency counter. The GNSS signal self-adaption quick traction method can achieve quick traction of strong signals, improve the successful rate of traction of weak signals, and reduce the probability of bit synchronization errors.

Description

technical field [0001] The present application relates to the field of satellite positioning and navigation communication, and in particular to a GNSS signal self-adaptive fast traction method. Background technique [0002] Global satellite positioning and navigation systems (GNSS), such as the GPS system, the Galileo system, the Beidou system, generally include a constellation of satellites that transmit GNSS signals that can be used by a receiver to determine the receiver's position. Satellite orbits are arranged in multiple planes so that the signal can be received from at least four satellites at any location on Earth. The GNSS signal transmitted by each GNSS satellite is a direct sequence spread spectrum signal. Each satellite transmits a different PRN (Pseudo Random Noise, pseudo-random noise) code, so that signals can be sent from several satellites at the same time and received by a receiver at the same time, with almost no interference between them. The term "sate...

Claims

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Application Information

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IPC IPC(8): G01S19/24
Inventor 杨颖陈杰
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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