Improved Code Tracking Method and Loop for Satellite Navigation Signal Receiver

A technology of satellite navigation signal and code tracking ring, which is applied in the direction of satellite radio beacon positioning system, measuring device, instrument, etc., can solve the problem of low precision, and achieve the effect of high precision, suppression of multipath interference, and low signal-to-noise ratio

Inactive Publication Date: 2018-06-26
GUILIN UNIV OF ELECTRONIC TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] What the present invention will solve is the problem that the code tracking method of the existing navigation satellite signal receiver has low precision, and the improved code tracking method and the loop of the satellite navigation signal receiver are provided

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  • Improved Code Tracking Method and Loop for Satellite Navigation Signal Receiver
  • Improved Code Tracking Method and Loop for Satellite Navigation Signal Receiver
  • Improved Code Tracking Method and Loop for Satellite Navigation Signal Receiver

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Embodiment Construction

[0029] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Improved code tracking loop for satellite navigation signal receivers, such as figure 2 As shown, it is mainly composed of N correlators, N integral accumulators, buffer module, least squares module, Kalman filter module, loop filter, pseudocode NCO (pseudocode numerically controlled oscillator) and pseudocode generator . The received intermediate frequency data and the local carrier are mixed and then output by the mixer. The output end of the mixer is divided into N channels, and each channel is connected to an input end of a correlator. The output of each correlator is connected to the input of an integrating accumulator. The output terminals of the N integral accumulators are simultaneously connected to the input terminals of the cache module. The output end of the cache module is connected to the input end of the least square...

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Abstract

The invention discloses an improvement code tracking method of a satellite navigation signal receiver and a loop. A method integrating the least square algorithm and the Kalman filtering algorithm is utilized to improve and optimize a code ring of a tracking ring, coherent integration results of all the related branches are processed through the least square algorithm to form a set of new observation points having properties of no bias, smallest mean square error sum and determined spatial distribution, the set of new observation points is further utilized for subsequent linear Kalman filtering to solve code phases of direct signals and multi-path signals, so the Kalman filtering algorithm is made to realize higher precision and high sensitivity, moreover, adding a divergence control module to a code ring Kalman filtering module is further proposed to discriminate and inhibit filter divergence. Through the method, not only can multi-path interference be effectively inhibited, weak satellite navigation signals with lower signal to noise ratios are tracked, but also higher code tracking precision is realized.

Description

technical field [0001] The invention relates to the technical field of satellite navigation receivers, in particular to an improved code tracking method and a loop of a satellite navigation signal receiver. Background technique [0002] In complex channel environments such as indoors, dense urban areas, tunnels, and dense forests, phenomena such as occlusion, multipath, and interference are more serious. The power of satellite navigation signals will be severely attenuated due to various penetration losses, and the signal amplitude and phase will also be affected by multipath. The impact of fading changes drastically. In this case, the satellite signal energy is even lower than -180dBW, and the receiving signal-to-noise ratio will seriously deteriorate. It will be difficult for ordinary navigation receivers to track satellite navigation signals. Therefore, it is very necessary to study a tracking method of satellite navigation signals that can still be tracked with high prec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21G01S19/22G01S19/30
CPCG01S19/21G01S19/22G01S19/30
Inventor 符强李基武甄卫民孙希延纪元法任风华严素清蔚保国范广伟陈奇东甘兴利
Owner GUILIN UNIV OF ELECTRONIC TECH
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