Method for high-precision dynamic point positioning through big dipper double frequency receiver

Abstract

The invention discloses a method for high-precision dynamic point positioning through a big dipper double frequency receiver.Double frequency high-sampling-frequency big dipper data is utilized, only one big dipper double frequency receiver is needed, it is not required to erect a base station or a CORS system or other auxiliary devices at a known point, error sources are eliminated or weakened through algorithms, an iteration least squares elimination method is used, a kalman filter based on single difference ambiguity and troposphere delay parameters is used for parameter calculating, an accurate absolute coordinate position can be obtained, working employment is easy and convenient, the positioning precision is high, the position of a satellite is conveniently locked, and the method is suitable for large working range applications.

Description

technical field [0001] The invention relates to a positioning method, in particular to a method for high-precision dynamic single-point positioning using a Beidou dual-frequency receiver. Background technique [0002] In GNSS positioning, it generally relies on differential processing to eliminate the effects of tropospheric delay, ionospheric delay, ephemeris error, and clock error. However, it is limited by the fact that there must be known points or CORS station coverage in the vicinity of the survey area, otherwise the accurate absolute position coordinates cannot be obtained, but only the relative position information between the rover and the base station can only be stopped. [0003] Compared with differential positioning, single-point positioning has its own advantages, especially the simplicity of work implementation and the relative balance of positioning accuracy. With the continuous improvement of the accuracy of IGS orbit products and clock error products, peop...

AI Technical Summary

Problems solved by technology

An important problem in the non-difference model is that the receiver clock error is linearly related to the carrier phase deviation, the accuracy of the model will directly affect the final positioning result, and the clock error drift level and reset mode of different receivers are different. hard for a job

At the same time, for applications with a large working range, the tropospheric moisture component changes greatly, which reduces the accuracy of the stochastic model and also affects the positioning accuracy of the PPP

More importantly, in actual dynamic applications, due to the relatively harsh observation environment of dynamic applications, cycle slips and satellites out of lock frequently occur, and because iterative calculations take a certain amount of time to converge parameters, cycle slips and satellite The problem of out-of-lock makes the data processing difficulty of PPP suddenly increase

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