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Integer ambiguity validity check method in satellite navigation system

A satellite navigation system, a technology of whole-week ambiguity, applied in the field of information processing, can solve the problems of affecting positioning accuracy, difficult to ensure the correctness of ambiguity fixation, poor ratio reliability, etc., to achieve the effect of improving reliability

Active Publication Date: 2016-02-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical experience, we know that in many cases, the difference between the residual quadratic minimum and the second minimum of the ambiguity is not large, for example, the ratio of the residual quadratic minimum to the minimum is close to 1, but in fact the ambiguity The fixation of is likely to be correct, which leads to the poor reliability of the existing ratio test
For long-distance and large-scale RTK, it is difficult to ensure the correctness of the fixed ambiguity, which affects the positioning accuracy

Method used

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  • Integer ambiguity validity check method in satellite navigation system
  • Integer ambiguity validity check method in satellite navigation system
  • Integer ambiguity validity check method in satellite navigation system

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Example 1: Select an open area of ​​the campus of China University of Petroleum, two measuring stations separated by 200 meters form a baseline, select 500 epochs in August 2, 2015, the sampling interval is 0.05s, and the data has no cycle slip phenomenon after detection . Dual-frequency GPS and Beidou satellites are used for multi-system fusion relative positioning, and the traditional F-ratio test method and the validity test method of the present invention are respectively used for validity test.

[0073] like figure 2 As shown, all the ambiguities of the whole week in Example 1 can be fixed correctly, from figure 2 It can be clearly seen from the figure that for the ambiguity that can be fixed correctly, the new ratio is larger than the original ratio, which shows that compared with the traditional F-ratio test method, the validity test of the present invention has been improved, thereby increasing the error correction. The discriminative degree of week ambiguit...

Embodiment 2

[0074] Example 2: Using an open area on the campus of Curtin University in Australia, two measuring stations separated by 4 meters form a baseline, and select from 0:00:00 on January 1, 2014 to 1:29 on January 1, 2014 The time period data of 30 seconds, the sampling interval is 30s, a total of 180 epochs, the data has no cycle slip phenomenon after testing. The dual-frequency GPS satellites are used for relative positioning, and then the LAMBDA method is used to fix the double-difference integer ambiguity in a single epoch, and the original ratio under the traditional quadratic statistic and the new ratio of the effectiveness testing method of the present invention are counted respectively.

[0075] In Example 2, from image 3 Select 10 epochs to count the success rate of the whole week ambiguity fixation, and take the whole week ambiguity static solution result as the true value. The statistical results are shown in Table 1. The new ratio of most epochs is larger than the ori...

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Abstract

The invention discloses an integer ambiguity validity check method in a satellite navigation system. The method includes the following steps that: step 1, an observation equation is established according to satellite observation quantity in the current epoch and a stochastic model, and the observation equation is solved, and a satellite integer ambiguity float point solution is obtained; step 2, the fixed solution of satellite integer ambiguity is searched through using a LAMBDA method and according to the satellite integer ambiguity float point solution obtained in the step 1, so that integer ambiguity smallest residual quadratic form and integer ambiguity second smallest residual quadratic form can be obtained; step 3, correct integer ambiguity check statistic quantity and wrong integer ambiguity check statistic quantity are calculated according to the integer ambiguity smallest residual quadratic form and the integer ambiguity second smallest residual quadratic form which are obtained in the step 2, and the validity of the correct integer ambiguity check statistic quantity and wrong integer ambiguity check statistic quantity are checked, and the correctness o satellite integer ambiguity fixation in the current epoch is judged. According to the method of the invention, deviation between the correct integer ambiguity check statistic quantity and the wrong integer ambiguity check statistic quantity is as high as possible, namely, discrimination degree of wrong integer ambiguity and correct integer ambiguity can be enhanced, and the reliability of the validity check can be improved.

Description

technical field [0001] The invention relates to the technical field of information processing, in particular to a method for checking the validity of the integer ambiguity in a satellite navigation system. Background technique [0002] At present, GNSS can provide all-weather and global navigation, positioning and measurement services for land, sea and air, and has been widely used in many industries such as transportation and surveying and mapping. Due to its high precision and automatic measurement characteristics, as an advanced measurement method and new productivity, it has been integrated into various application fields of national economic construction, national defense construction and social development. [0003] GNSS mainly has two observations: pseudorange and carrier phase observations. The pseudo-range can be obtained by correlating the pseudo-random code broadcast by the satellite with the replica code of the receiver, and the carrier phase observation refers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 姬生月王振杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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