A combined precise point positioning method and system based on inter-constellation difference

Abstract

The invention discloses a combination precise single-point positioning method and system based on inter-constellation difference. The combination precise single-point positioning method comprise the steps that original observation values and auxiliary parameters, observed on an observation station, of the different constellations are obtained; the original observation values are preprocessed; thepreprocessed original observation values are subjected to non-ionizing combination; inter-constellation difference is conducted on non-ionizing layer combination observation of a single constellation;an error observation equation is determined based on an observation model for inter-constellation difference; the preliminary position of the observation station and observation value noise are obtained; the elevating angles of all satellites are determined based on satellite orbit parameters and the preliminary position of the observation station; a random model of each set of inter-system difference observation values is determined on the basis of the elevating angles of all the satellites and the observation value noise; a weight matrix is determined; and position parameters, inter-constellation difference ambiguity parameters and troposphere parameters are estimated through a least square method on the basis of the error observation equation and the weight matrix, and thus single-point positioning is achieved. According to the combination precise single-point positioning method, high-precision observation station positioning information and inter-system time difference parameter information can be obtained.

Description

technical field [0001] The present invention relates to the field of precise point positioning, in particular to a combined precise point positioning method and system based on difference between constellations. Background technique [0002] Precise Point Positioning (PPP) only needs a single GNSS receiver, and can achieve centimeter-level positioning accuracy by using high-precision satellite orbit and clock error products. Due to the advantages of no need for users to set up ground reference stations, positioning is not limited by the operating distance, low cost and high positioning accuracy, PPP technology is widely used in large-scale mobile measurement, low-orbit satellite orbit determination, precise timing, atmospheric science, geodynamics, etc. It has unique application value. At present, there are three types of precision point positioning models commonly used, the ionosphere-free combination model, the non-difference non-combination model, and the Uofc model. The...

AI Technical Summary

Problems solved by technology

The current combined PPP models are all simple data superposition and combination based on the single-system PPP model, and do not take into account the common receiver clock parameters of multiple systems.

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