Carrier Phase Smoothing Method and Device in GNSS

Abstract

The embodiment of the present application discloses a method and device for smoothing carrier phase in GNSS. The device includes: an acquisition module, configured to acquire a pseudorange measurement value and a carrier phase measurement value of the GNSS receiver at the current epoch; a first filtering module, configured to perform smoothing times n on the pseudorange observation value 1 The carrier phase smoothing process of the first pseudo-range smoothing value is obtained; the second filtering module is used to perform smoothing times n on the pseudo-range observation value 2 The carrier phase smoothing process of the second pseudo-range smoothing value is obtained; the third filtering module selects the number of times of smoothing n 1 , n 2 The pseudo-range value obtained by the smoothing operation with a large medium value is the input value, and the pre-acquired deviation value is used to compensate the input value to obtain the final smoothed value of the pseudo-range; where T is the upper limit of the smoothing window , n 1 , n 2 and T are positive integers.

Description

technical field [0001] The embodiment of the present application relates to the field of information processing, in particular to a method and device for smoothing carrier phase in GNSS. Background technique [0002] In GNSS (Global Navigation Satellite System, Global Navigation Satellite System) observation, the measurement noise of carrier phase is 2 orders of magnitude larger than that of pseudorange, and the influence of carrier phase by multipath error is no more than 1 / 4 of the wavelength, while pseudorange is more than 1 / 4 of the wavelength. Path effects may reach 2.5 symbol lengths. In order to effectively improve the accuracy of pseudorange observations and smooth pseudorange values ​​without initial integer ambiguity, high-precision carrier phase observations can be used to smooth pseudorange values. This technology has been widely used in the GNSS field. [0003] Hatch filtering is the most widely used phase smoothing pseudorange method at present. For single-fr...

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Problems solved by technology

However, both DFS and CNMC filtering methods need to use dual-frequency phase combination to eliminate the ionospheric error of single-frequency pseudorange, which introduces amplified phase random error to the smooth pseudorange result; and IFS filter also introduces The pseudo-range observation errors at two frequency points lead to more systematic errors and noises of the smoothed pseudo-range observations after filtering than DFS filtering

In addition, the dual-frequency carrier-phase Hatch filter requires that the carrier signals of the two frequency points are continuous, and any interruption or jump of the observed value will cause the filter to terminate and restart the smoothing operation

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