A Method for Determining Integer Ambiguity of Three-Frequency Carrier Phase in Beidou Navigation System

Abstract

The invention provides a method for determining a whole-cycle ambiguity of a three-frequency carrier phase of a BeiDou navigation system. The method comprises the steps of by utilizing the advantage of high determination accuracy rate of a whole-cycle ambiguity of a BeiDou ultra-wide lane carrier phase combination, firstly determining whole-cycle ambiguities of two groups of ultra-wide lane carrier phase combinations, and correcting a pseudo-range initial value through the whole-cycle ambiguities of the ultra-wide lane carrier phase combinations; meanwhile, removing influences from an orbit error, a clock error and an ionized layer error in original observed quantity by combining with carrier phase observation quantity of geometry-free de-ionized layer composed of a narrow lane carrier phase combination, so as to enable the resolution of the whole-cycle ambiguity of the narrow lane carrier phase combination to be only affected by random measurement noise; taking an average value of combined observation quantity of multiple epochs to remove random noise error and determine the whole-cycle ambiguity of the narrow lane carrier phase combination; finally, determining the whole-cycle ambiguity of the carrier phases of three frequencies B1, B2 and B3 by resolving a system of linear equations which is composed of the whole-cycle ambiguities of the two ultra-wide lane carrier phase combinations and the whole-cycle ambiguity of the narrow lane carrier phase combination.

Description

technical field [0001] The invention belongs to the technical field of Beidou satellite navigation applications, and in particular relates to a method for determining the ambiguity of the three-frequency carrier phase of the Beidou navigation system. Background technique [0002] With the rapid construction of my country's Beidou satellite navigation system, the Beidou navigation system will soon provide navigation and positioning services for users around the world. A notable feature of the Beidou navigation signal is that it provides carrier signals of three frequencies B1, B2, and B3 at the same time. At present, high-precision navigation and positioning is carried out through satellite navigation, and the carrier phase measurement data of the three frequencies of B1, B2, and B3 of the receiver are mainly used. As a navigation positioning observation. However, there are integer ambiguity unknowns in the carrier phase measurement data of these three frequencies that need ...

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Problems solved by technology

[0004] This simple step-by-step rounding method without geometry mode has certain defects, that is, in the process of determining the integer ambiguity of the carrier phase narrow-lane combination with the carrier-phase wide-lane combination as the initial value, the estimation error is close to 1 / 2 narrow-lane wavelength, therefore, when the original carrier phase measurement noise is large, it is very easy to cause the calculation result of the narrow-lane combined ambiguity to deviate from the real value, which in turn causes the carrier phase ambiguity of the frequency B1, B2, and B3 to fluctuate. OK result error

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