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Method and device for fast capturing signal in high-sensitivity navigational satellite receiver

A navigation receiver and high-sensitivity technology, which is applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as limiting the application range of global navigation satellite systems, failing to capture navigation satellite signals, and solving positioning, etc., to achieve The effect of improving the signal-to-noise ratio, avoiding the square loss, and reducing the impact

Inactive Publication Date: 2010-06-02
ZHEJIANG UNIV
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Problems solved by technology

The currently commonly used coherent integration, non-coherent integration and coherent-non-coherent integration methods cannot solve this problem very well, resulting in the navigation satellite receiver being unable to capture the navigation satellite signal in a complex environment, and thus unable to perform follow-up tracking and positioning calculation , which greatly limits the scope of application of GNSS

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  • Method and device for fast capturing signal in high-sensitivity navigational satellite receiver

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Embodiment Construction

[0033] The invention realizes a fast signal acquisition device in a high-sensitivity navigation satellite receiver. Receive the baseband satellite signal and perform correlation calculation with the reference spreading code in the matched filter, then use differential coherent integration technology to improve the signal-to-noise ratio, use the comprehensive analysis results of the detector to judge whether there is the required satellite signal and find the satellite The chip offset between the signal and the reference spreading code. In the embodiment, the sampling clock of the system is 4.8MHz. If the GPS signal is captured, the code rate of the spreading code is 1.023MHz, and the code rate of the Beidou 2 system is 2.046MHz. According to Stern's sampling law, the spreading code period of the two is 1ms, so the number of sampling points in one spreading code period is 4800.

[0034] The fast signal acquisition method in the high-sensitivity navigation satellite receiver co...

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Abstract

The invention discloses method and device for fast capturing a signal in a high-sensitivity navigational satellite receiver. The device carries out relative algorithm by a matched filter and can completely calculate possible relative results in deviational positions of codes after one spreading code period, thereby greatly increasing the searching speed of capturing. After relative algorithm is carried out by matched filtering, difference coherent integration is adopted to increase the signal to noise ratio, which reduces the influence of navigation messages on integral and also can avoid the square loss caused by long-time non-coherent integration. A controller in the device can set the integral frequency as well as the detection threshold of a detector, which leads the device to adapt to a plurality of situations. The lower limit of strength of the navigational satellite signal which can be captured by the device is -145dbm, and the device is applicable to the two systems of GPS and Beidou.

Description

technical field [0001] The invention relates to a method and device for quickly capturing signals in a high-sensitivity navigation satellite receiver. Background technique [0002] In addition to the more mature American GPS and Russia's GLONASS, the global navigation satellite system also includes the European Galileo system and my country's Beidou system, which are under development. It is a radio positioning system that estimates the propagation of radio waves from navigation satellites to receivers Delay, to get the straight-line distance from the receiver to the satellite, which is a ranging method using the time of arrival (TOA); through the space calculation of the satellite constellation, the position of the satellite can be obtained; in the known distance between the receiver and multiple satellites The position of the receiver can be obtained on the basis of the distance and the corresponding satellite. Therefore, the main purpose of the receiver is to estimate the ...

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Application Information

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IPC IPC(8): G01S19/30
Inventor 侯维玮赵民建王勇松沈颖洁李云飞
Owner ZHEJIANG UNIV
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