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Method for implementing autonomous integrity of northern dipper second-generation receiver

An implementation method and a receiver technology, which are applied in the field of autonomous completeness detection, can solve problems such as high missing alarm rate of the integrity algorithm, poor satellite geometric structure, and reduced positioning accuracy, so as to achieve good geometric structure, high positioning accuracy, and reduced The effect of missed detection rate

Inactive Publication Date: 2012-04-04
郑州威科姆科技股份有限公司
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Problems solved by technology

[0005] Although the satellites of the second generation of Beidou provide wide-area differential information and integrity information, there are inevitably abnormalities, which lead to large positioning errors, and because the second generation of Beidou has 5 GEOs distributed over the equator, it is approaching the equator Nearby, the geometric structure of the satellite is poor, which leads to a large false alarm rate in the integrity algorithm and a decrease in positioning accuracy

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  • Method for implementing autonomous integrity of northern dipper second-generation receiver
  • Method for implementing autonomous integrity of northern dipper second-generation receiver
  • Method for implementing autonomous integrity of northern dipper second-generation receiver

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Embodiment Construction

[0019] As shown in the figure, the present invention comprises the following steps:

[0020] Step 1, according to the observation equation, obtain the contribution of each visible satellite to the GDOP, and sort according to the GDOP value from large to small. In this step, firstly, according to the second-generation pseudorange observation model, it can be expressed as follows:

[0021] y=Hx+ε (1)

[0022] Among them, y is an n-dimensional vector of the difference between the observed pseudorange and the approximate calculated pseudorange, n is the number of satellites; H is an n×4-dimensional coefficient matrix; x is a 4-dimensional parameter vector, including 3 user position correction parameters and 1 receiver clock bias correction parameter; ε is the n-dimensional observed pseudo-range noise vector, if there is a deviation, it is represented by ε+b.

[0023] Let Hm be the observation matrix when m satellites are selected for positioning, remove the i-th star (i-1,...,m)...

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Abstract

The invention relates to a method for implementing autonomous integrity of northern dipper second-generation receiver, which comprises the following steps of: step 1, according to observational equation, working out contribution of each visible satellite on GDOP, and sorting from big to small based on the GDOP values; step 2, selecting six satellites with maximum contributions for calculating; step 3, according to observational equation of the six selected satellites, forming odd-even space vector, and forming test statistic based on the odd-even space vector; step 4, according to RAIM algorithm of the odd-even space vector, checking and identifying faults; if this satellite has no fault after checking, using the six selected satellites for localization; and if this satellite has a fault after checking, removing the satellite with fault, selecting next satellite with maximum contribution of GDOP, and using new selected six satellites for localization.

Description

technical field [0001] The invention relates to a method for autonomous completeness detection of a second-generation Beidou receiver. Background technique [0002] At 4:11 on April 14, 2007, a "Beidou-2" navigation satellite was sent into space by the "Long March 3A" carrier rocket from the Xichang Satellite Launch Center. As a result, my country opened the prelude to the deployment of the "Beidou-2" satellite navigation system. [0003] The "Beidou-2" satellite navigation system is a satellite navigation system built on the basis of "Beidou-1", but it is not a simple extension of "Beidou-1". The completed "Beidou-2" satellite navigation system is a global satellite navigation system similar to GPS and GLONASS. [0004] Beidou satellite navigation system consists of three parts: space satellite system, ground operation and control system and user application system. Composed of 5 geostationary earth orbit (GEO) satellites and 30 non-geostationary orbit satellites, it pro...

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Application Information

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IPC IPC(8): G01S19/13G01S19/23
Inventor 贾小波吴淑琴弓永魁张筱南邹世合
Owner 郑州威科姆科技股份有限公司
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