Ocean tide load displacement parameter estimation method based on precise point positioning (PPP) and harmonic analysis

Abstract

The invention provides an ocean tide load displacement parameter estimation method based on precise point positioning (PPP) and harmonic analysis. Three-dimensional ocean tide load displacement influences are regarded as unknown parameters, and together with other PPP positioning parameters, real-time estimation is carried out; and through harmonic analysis, the ocean tide load displacement parameters for each tidal wave are extracted. Based on a theory of estimating 48 ocean tide parameters by static PPP, 3 unknown ocean tide parameters are used to replace the 48 parameters, the ocean tide load displacement is estimated dynamically and in real time, reduction of the estimated value calculation strength due to rapid increasing of unknown numbers can be effectively avoided, and advantage complementation between the static PPP and the dynamic PPP can be realized. The ocean tide load displacement parameter estimation method based on precise point positioning and harmonic analysis has theadvantages that the algorithm is advanced; the precision is high; the stability is strong; the automatic degree is high; the realization is simple; a high-precision and high-resolution ocean tide loaddisplacement model for a coastal area can be constructed through ocean tide parameter estimation; and service and guarantee are provided for correction of ocean tide load effects in high-precision GNSS data processing.

Description

technical field [0001] The invention relates to a method for estimating sea tide load displacement parameters. Background technique [0002] Among the existing methods for estimating ocean tide load displacement parameters, compared with superconducting gravity and very long baseline interferometry technology, GPS technology has the advantages of global coverage, many stations, low requirements for observation environment, and low cost. The observation value is sensitive to the tidal load response, and the observation deviation caused by the tidal load can be accurately obtained through the GNSS observation value. The current method of estimating tidal load displacement is to add 48 tidal load displacement parameters to the static PPP to solve together with other parameters (station coordinates, receiver clock error, tropospheric delay, ambiguity, etc.), and use Kalman filter to obtain each tidal load displacement The absolute amplitude and phase of the wave. However, this...

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Problems solved by technology

However, this method usually uses GIPSY / OASIS software to process 24-hour observation data, and only obtains a set of estimated values ​​per day, which will average some tide information, resulting in some partial tidal wave (such as 1 / 3 diurnal tide) signals not being displayed , and the sharp increase in unknowns will reduce the calculation strength of the valuation

At the same time, the accuracy of dynamic PPP is cm level, and it is impossible to estimate the sea tide load displacement with high precision. How to improve the shortcomings of the existing methods, obtain high-precision sea tide load displacement, and better serve high-precision GNSS positioning is of great value

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