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Dynamic ambiguity confirming method

A determination method and dynamic blurring technology, applied in positioning, satellite radio beacon positioning systems, instruments, etc., can solve the problems of short baseline distance, slow speed, low reliability, etc., to expand distance, increase reliability, and speed up blurring. The effect of degree search

Inactive Publication Date: 2009-04-08
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that the baseline distance of dynamic determination of ambiguity in the prior art is relatively short (generally 15km); it provides a method that can quickly and dynamically determine the ambiguity of medium and long distances
[0006] Another purpose of the present invention is to solve the technical problems of the prior art that directly determine the ambiguities of L1 and L2 carrier phases, such as slow speed and low reliability; it provides a method to first determine the ambiguities of wide lanes and then determine L1 and L2 Fast and Reliable Ambiguity Determination Method of Carrier Phase

Method used

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Embodiment

[0030] A method for determining the degree of dynamic ambiguity, the specific steps are:

[0031] First, determine the wide-lane ambiguity, the specific steps are as follows:

[0032] Step 1.1, collect a new epoch by the epoch acquisition unit, and calculate its wide-lane observation value, MW combination observation value and ionization-free combination observation value;

[0033] Step 1.2, the coordinate parameter elimination unit performs coordinate parameter elimination on the equation about wide-lane ambiguity and coordinate parameters formed by the above-mentioned wide-lane observation value and MW combination observation value;

[0034] After using the elimination algorithm to eliminate the coordinate parameters in the wide-lane observation equation, the observation equation with only the wide-lane ambiguity as parameter Y can be obtained as shown in equation (1):

[0035] I · ...

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Abstract

The invention relates to an equivocation determining method, in particular to a dynamic equivocation determining method. The invention adopts an LAMBDA method to search a plurality of groups of equivocations, and then utilizes the square sum of residuals which is alternatively combined to detect, thereby the reliability of the equivocation determination can be increased. The invention utilizes the known wide-lane equivocation and L1 equivocation to express the non-ionosphere equivocation combination for carrying out the equivocation search so that the influence on a first-order phase of an ionosphere is eliminated, and the integer performance of the searched equivocation can be caused, thereby the distance of the equivocation search is enlarged, various conditions for rapidly and dynamically determining the long-distance equivocation are fully utilized, and the equivocation search is accelerated.

Description

technical field [0001] The invention relates to a method for determining ambiguity, in particular to a method for determining dynamic ambiguity. Background technique [0002] At present, GNSS high-precision fast dynamic positioning is widely used, and fast dynamic ambiguity resolution is the key to high-precision positioning. Many scholars at home and abroad have done a lot of research on fast dynamic ambiguity resolution, and obtained many practical methods. The dual-frequency P code method and the least squares search algorithm proposed by Hatch. Chen Xiaoming proposed the Kalman filter method with additional ambiguity parameters. This method considers the ambiguity parameters as the state of the filter, uses the double-difference ambiguity real number solution value and the covariance matrix of the initial epoch as the initial value, and then passes the Kalman Mann filter, gradually solve to calculate the correct ambiguity real number solution. Gao Xingwei proposed a s...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S19/43
Inventor 唐卫明刘经南施闯
Owner WUHAN UNIV
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