Pseudo-range and carrier phase random model construction method based on BDS three-frequency combination

Abstract

The invention discloses a pseudo-range and carrier phase random model construction method based on BDS three-frequency combination, and relates to the technical field of satellite navigation and positioning, and the method comprises the steps: obtaining BDS three-frequency original observation data; establishing a GIF combination of the three-frequency pseudo range and the carrier phase, and estimating a variance-covariance of the GIF combination; according to the variance-covariance of the GIF combination, constructing an original pseudo-range random model through linear combination relationtransformation; establishing a GF combination of the three-frequency carrier phase, and estimating a variance-covariance of the GF combination; and introducing a carrier/pseudo-range noise scaling factor matrix, and constructing a random model of an original carrier phase according to the original pseudo-range random model and the variance-covariance of the GF combination. According to the method,the construction of the BDS random model is greatly optimized and improved, the influence of the inaccurate random model on a precision positioning result is weakened, the precision of precision calculation of RTK, PPP and POD is improved, and ambiguity calculation and state estimation are improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning, in particular to a pseudo-range and carrier phase random model building method based on BDS triple-frequency combination. Background technique [0002] The Beidou Satellite Navigation System (hereinafter referred to as "BDS") is a satellite navigation system independently constructed and operated by China focusing on the needs of national security and economic and social development. It provides all-weather, all-time, high-precision positioning and navigation for global users Nationally important space infrastructure for Positioning Navigation and Timing (PNT). BDS is currently the first system in the world to provide triple-frequency signal services for the entire constellation. Compared with single-frequency or dual-frequency signals, triple-frequency signals can provide users with more redundant observation information and more flexible processing methods. Positio...

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Problems solved by technology

[0004] The GIF combination method is more suitable for the estimation of the accuracy of pseudorange observations, while the estimation of the carrier phase variance-covariance array generally assumes that each frequency point is independent and equal in accuracy, which ignores the difference in accuracy between each frequency point and the accuracy of each frequency point. The cross-correlation between; or combined with the variance component estimation algorithm, the calculation is more complicated, and the cross-correlation between the pseudo-range and carrier phase of each frequency point is not distinguished

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