Singular point preservation filtering noise reduction cycle jump detection method

Abstract

The invention provides a singular point preservation filtering noise reduction cycle jump detection method. The method comprises the steps that 1 an MW combination observation sequence is established;2 initializing is carried out; 3 outliers in the MW combination observation sequence are eliminated; 4 first order differentiating is carried out on the sequence; 5 extreme value and median filteringis carried out on the differential sequence; 6 sliding average denoising is carried out to acquire the estimated value of the epoch i and the estimated value of the variance thereof; 7 a cycle jump criterion is used to determine whether cycle jump occurs, and the cycle jump epoch and the jump variable are recorded; and 8 an average window slides to the last epoch. According to the invention, MW combination noise reduction is realized, and at the same time a cycle jump signal is not filtered; the detection accuracy is improved; and the problem that one to two cycles of small cycle jump cannotby precisely detected due to excessive noise of MW combination is solved.

Description

technical field [0001] The invention belongs to the technical field of GNSS observation data processing, and relates to a GNSS precise single-point positioning preprocessing technology, in particular to a cycle slip detection method for singular point retention filtering and noise reduction. Background technique [0002] At present, with the application and development of GNSS (Global Navigation Satellite System, Global Navigation Satellite System) in various fields, different users require positioning services with different accuracy. The service precision required in the fields of surveying and mapping, atmosphere, and earthquake monitoring is getting higher and higher. Compared with pseudorange observations, carrier phase observations have the advantages of high precision and low noise, and are widely used in high-precision positioning and orbit determination services. However, because the carrier phase itself has cycle slips and the ambiguity of the whole cycle is not f...

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Problems solved by technology

[0008] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a cycle-slip detection method for singularity-preserving filtering and noise reduction, which can realize noise reduction for MW combination while keeping the cycle-slip signal from being filtered out, thereby improving The effect of detection accuracy solves the problem that MW combinations cannot accurately detect small cycle slips of one to two cycles due to excessive noise

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