BDS/GPS (BeiDou Navigation Satellite System/Global Positioning System) wide-lane fuzziness single epoch fixation method based on BeiDou overwide-lane constraint

Abstract

The invention discloses a BDS / GPS (BeiDou Navigation Satellite System / Global Positioning System) wide-lane fuzziness single epoch fixation method based on BeiDou overwide-lane constraint. The method comprises the following steps that the combined fuzziness of overwide lanes (0,-1,1) and (1,4,-5) of a BDS is calculated by using a BDS three-frequency pseudorange and carrier wave observation data combined single epoch received by a GNSS (Global Navigation Satellite System) receiver; the wide-lane combined fuzziness of BeiDou (1,-1,0) with smaller observation noise and ionized layer delay is calculated by combining two fixed overwide-lane fuzziness; after the BDS wide-lane fuzziness is fixed, the BDS wide-lane fuzziness is used as a high-precision constraint condition and is simultaneous witha GPS wide-lane observation equation obtained by combination with the GPS double-frequency observation data received by the receiver; the observing model obtained in the previous step is subjected toKalman filtering resolving to obtain the floating point solution and variance covariance matrix of the GPS double-difference wide-lane fuzziness; integer fixation is performed by an LAMBDA algorithm;the GPS double-difference wide-lane fuzziness integer solution is obtained. The single epoch fixation of the BDS / GPS wide-lane fuzziness is realized; the timeliness of the GNSS baseline solution is effectively improved.

Description

technical field [0001] The invention relates to the technical field of global satellite navigation system positioning, in particular to a BDS / GPS wide-lane ambiguity single-epoch fixing method based on Beidou ultra-wide lane constraints. Background technique [0002] At the end of 2012, the Beidou second-generation satellite navigation and positioning system officially provided services to the Asia-Pacific region. As the first satellite navigation and positioning system in the world to provide triple-frequency services, Beidou opened the era of GNSS triple-frequency positioning. In addition, with the modernization of GPS and GLONASS and the continuous improvement of Galileo, multi-frequency has gradually replaced dual-frequency as the development trend of GNSS. [0003] Using multi-frequency GNSS signals, many linear combination observations with long wavelength, small noise and weak ionosphere influence can be constructed, which greatly enriches the GNSS solution scheme. M...

AI Technical Summary

Problems solved by technology

Multi-frequency GNSS ambiguity resolution can avoid the complex calculation of traditional search methods. According to the wavelength and error characteristics of different combined observation values, simple rounding and rounding methods are used to fix the ambiguities of each combination step by step. Currently, GPS and GLONASS systems broadcast There are relatively few tri-frequency signals, and the Galileo system is not perfect enough. In some high-occlusion environments, it is difficult to use a single BDS system to achieve multi-frequency calculations. Due to the influence of GEO satellites, the graphic structure is weak in some areas and cannot be realized. high precision positioning

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