GPS single epoch deformation monitoring sidereal day cycle error elimination method

Abstract

The invention discloses a GPS single epoch deformation monitoring sidereal day cycle error elimination method, which belongs to the field of surveying and mapping science and technology. The geometric position relationship between a GPS satellite and a ground monitoring station is repeated with a sidereal day as a cycle, and a GPS system error has whole-cycle day features. In the existing system error elimination method, prolonging of observation time is impractical for the single epoch. An error model is established based on a satellite altitude angle and an azimuth angle, which is complicated and is not practical. Discrete sidereal day filter does not adopt a continuous correction function, and a time point is hard to be aligned. A time series maximum correlation coefficient is adopted to determine a recurrence cycle, high-frequency noise is filtered through median filtering, a correction model is built for the system error by using the continuous function and is dynamically updated, different recurrence cycles in three directions of NEU can be determined, high-frequency noise and cycle errors can be eliminated, and the GPS single epoch deformation monitoring precision is improved.

Description

technical field [0001] The invention relates to a GPS single epoch deformation monitoring method for eliminating sidereal cycle errors, and belongs to the technical field of "satellite geodesy" in the discipline of "geodesy and surveying engineering". Background technique [0002] As we all know, GPS deformation monitoring has the advantages of all-weather, automation, high sampling rate, and freedom to set up stable reference points, so it is widely used in landslide monitoring, high-rise building monitoring, crustal deformation monitoring, and earthquake monitoring. Since GPS satellites fly dynamically in the sky and the earth is also rotating, the geometric position relationship between GPS satellites and ground monitoring stations is repeated in a cycle of a whole sidereal day, and various systematic errors of GPS signals have the characteristics of a whole day, such as Typical multipath effects. Due to the existence of sidereal day periodic systematic error, the accura...

AI Technical Summary

Problems solved by technology

The error prediction model is established according to the altitude angle and azimuth angle of the satellite. During the entire observation period, new satellites appear in the field of view and old satellites disappear, and the satellite altitude angle and azimuth angle are in complex changes. no practicality

Sidereal day filtering usually uses ephemeris files to obtain the recurrence period of each GPS satellite, but the deformation monitoring time series is the result of comprehensive calculation of the phase observations of multiple satellites, and the period of the deformation time series is not the same as that of a single GPS satellite. Strictly correspond

The sidereal day filter uses the weighted average of multiple days as a discrete correction number to correct the new time series, instead of using a continuous correction model function, and it is difficult to strictly align the corrected time points

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