Smoothing method and device for carrier phase in GNSS

Abstract

The embodiment of the invention discloses a smoothing method and device for a carrier phase in a GNSS. The device comprises an acquisition module used for acquiring a pseudo-range measurement value and a carrier phase measurement value of a GNSS receiver at the current epoch moment, a first filtering module used for executing carrier phase smoothing of which the smoothing frequency is n1 on the pseudo-range observation value to obtain a first pseudo-range smoothing value, a second filtering module used for executing carrier phase smoothing of which the smoothing frequency is n2 on the pseudo-range observation value to obtain a second pseudo-range smoothing value, and a third filtering module used for selecting the pseudo-range value obtained by the smoothing operation with the larger smoothing frequency in n1 and n2 as an input quantity, and performing compensation operation on the input quantity by utilizing a deviation value obtained in advance to obtain a final pseudo-range smoothing value, wherein T is the upper limit value of a smooth window, and n1, n2 and T are positive integers.

Description

Technical field [0001] The embodiments of the present application relate 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) observations, the measurement noise of the carrier phase is 2 orders of magnitude larger than the pseudorange, and the carrier phase is affected by multipath errors not more than 1 / 4 of the wavelength, and the pseudorange is more The path effect may reach a length of 2.5 symbols. In order to effectively improve the accuracy of pseudorange observations and there is no initial ambiguity in the pseudorange value after smoothing, the pseudorange value can be smoothed by using high-precision carrier phase observations. This technology has been widely used in the GNSS field. [0003] Hatch filtering is currently the most widely used phase smoothing pseudorange method. For single-frequency GNSS users, if Hatch filtering is direct...

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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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