Dynamic post-processing method and device

Abstract

The invention provides a dynamic post-processing method and device. The method comprises the following steps: carrying out error correction on original carrier phase and original pseudo-range data; according to the corrected original carrier phase and original pseudo-range data, establishing carrier phase double-difference equations and pseudo-range double-difference equations of L1, L2, LW and LC by adopting a strategy of taking elevation angle sine as a weight; eliminating an ionosphere delay first-order item by adopting an LC ionosphere elimination combination; when a reference satellite is changed, adopting a double-difference ambiguity smooth transition strategy to reduce the number of double-difference ambiguity; determining an L1 fixed solution, an L2 fixed solution and an LC fixed solution according to the carrier phase double-difference equations and the pseudo-range double-difference equations of the L1, the L2, the LW and the LC; and determining an epoch optimal solution according to the L1 fixed solution, the L2 fixed solution and the LC fixed solution. The method can break through the limitation of the real-time dynamic positioning distance, and improves the precision of dynamic post-processing understanding.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning, in particular to a dynamic post-processing method and device. Background technique [0002] A dynamic post-processing (PPK, Post Processed Kinematic) technology is a dynamic post-processing technology, and its specific principle is dynamic carrier phase difference. Compared with real-time kinematic positioning (RTK, Real Time Kinematic), dynamic post-processing does not need to transmit reference station data to the rover in real time, so there is no data link station and no need to wait for initialization. This provides great convenience for point measurement. Due to the use of post-processing, there are more ways to process data, and the processing results with higher precision can be obtained. At the same time, the distance can be extended farther than real-time dynamic positioning. The advantages of dynamic post-processing over real-time dynamic positioning make ...

AI Technical Summary

Problems solved by technology

LC combined noise will be greater than L1 or L2, but in the long distance, the accuracy of LC fixed solution is greater than L1 or L2 fixed solution

The general dynamic post-processing algorithm uses one of the solutions for processing. As the distance between the rover and the reference station changes, the accuracy of a single fixed solution will inevitably decrease.

[0006] As the elevation angle of the reference satellite decreases or even disappears, the double-difference ambiguity between other satellites and the reference satellite also disappears, and the selection of a new reference satellite will generate a new double-difference ambiguity, which loses its relationship with the original double-difference ambiguity. Originally fixed double difference ambiguity could not transition smoothly

At the same time, as the satellite elevation angle decreases, the data noise increases, and the equal weight strategy adopted by most software will inevitably affect the accuracy of the final solution

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