Method for estimating phase deviation in precise single-point positioning technology

Abstract

The invention discloses a method for estimating a phase deviation in a precise single-point positioning technology, which comprises the steps of: firstly, carrying out parameter estimation on single-difference non-ionized layer combined ambiguity by using a position as a restraint condition according to data of a reference station in a tracking network; secondly, carrying out parameter estimationon single-difference wide-lane ambiguity by adopting an M-W combination, separating out a decimal part of the single-difference wide-lane ambiguity, and carrying out decimal deviation calculation by using a directional data statistic theory, modifying and fixing the single-difference wide-lane ambiguity as an integer; thirdly, resolving a single-difference L1 ambiguity floating point solution according to a single-difference non-ionized layer ambiguity estimation value and a single-difference wide-lane ambiguity integer solution, separating the decimal part, carrying out decimal deviation calculation by using the direction data statistic theory; and finally, broadcasting the wide-lane and the L1 phase deviation decimal part to a user of a roving station so as to be used for fixing the single-difference integral ambiguity solution of the wide lane and the L1 and further obtaining a PPP (Point to Point Protocol) static solution.

Description

technical field [0001] The invention relates to the estimation and correction of errors in the precise point positioning (PPP) technology, in particular to a method for estimating the phase deviation in the precise point positioning technology, which is an important part of the ambiguity fixation in the PPP technology. Background technique [0002] Real-time precise point positioning technology is a high-precision positioning method based on correction information in the state space domain, and is currently a popular technology in the field of satellite positioning. From the perspective of technology development mode, precise single-point positioning technology is a positioning technology that combines standard single-point positioning technology and wide-area differential technology. Its appearance has changed the current situation that only double-difference positioning mode can achieve high-precision positioning. Positioning technology is another technological revolution ...

AI Technical Summary

Problems solved by technology

In the traditional precision point positioning mathematical model, the error of phase deviation is usually ignored, and the ambiguity parameter is estimated together with the receiver position as a real parameter, so the integer characteristics of the ambiguity cannot be used, and the parameter estimation can only be done with the observation The accumulation of quantity and the change of geometric structure tend to converge gradually

These phase deviations are mapped into ambiguities, so that the integer ambiguities of non-differenced and single-differenced observations no longer have the characteristics of integers, and cannot be fixed exactly even when other error effects are negligible, because these The ambiguity still exists as a real solution

The research on phase deviation in precise point positioning is mainly divided into two categories. One type uses the method of separating the fractional part of the phase deviation from the integer and calculating the arithmetic mean of the fractional part of the deviation. This type of method mainly includes non-difference phase deviation estimation. method, single-difference phase deviation estimation method; when calculating the phase deviation in this way, the precise orbit and clock error information of the satellite is directly used without estimating the precise clock error of the satellite, and the calculation is convenient and simple; however, the final The phase deviation does not truly reflect the essence of the phase deviation, resulting in a large error in the obtained phase deviation

The other method uses satellite clock error estimation. This method uses the satellite clock error to absorb the fractional part of the phase deviation, and directly solves the non-difference ambiguity. When estimating the phase error, the satellite clock error is also used as the parameter to be estimated. Modeling, and computationally complex

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