Double-antenna A-GNSS receiving machine system

Abstract

The invention discloses a double-antenna A-GNSS receiving machine system. The double-antenna A-GNSS receiving machine system utilizes double antennae to perform positioning, the auxiliary antenna is arranged in the open sky to be positioned so as to extract code phases and carrier wave Doppler values in satellite signal digital channels, calculating satellite signal navigation message information and then utilizing the auxiliary information to assist baseband processing of a target antenna receiving signal. In the baseband processing process of the target antenna receiving signal, the code phase values and the carrier wave Doppler values are set according to the auxiliary information, the capture process and the frequency pulling process of a receiving machine system can be omitted, and tracking process is directly performed after code phase pulling. The coherent integration time is prolonged by eliminating the bit influence during tracking, the tracking accuracy and the sensitivity are improved by adopting pure phase-locked loop phase discriminator and other modes, and the positioning speed and positioning performance are finally improved in the weak-signal and complicated-signal environments.

Description

[0001] technical field [0002] The invention belongs to the field of Global Navigation Satellite System (GNSS), in particular to a dual-antenna A-GNSS (Assisted GNSS, assisted GNSS) receiver system. Background technique [0003] GNSS is a satellite-based radio positioning and navigation system, including the US Global Positioning System (Global Positioning System, GPS), China's Beidou system, European Galileo, and Russia's GLONASS system. GNSS signals are transmitted from satellites 20,000 kilometers away, and when they reach the antenna end of the ground receiver, the signals are weak and easily blocked or interfered. Therefore, GNSS receivers are used indoors, where the signal is weak or the signal environment is complex such as buildings and leaves. It is difficult to achieve positioning, and the quality of positioning is not high. However, the demand for surveying, mapping and navigation applications in these environments is strong, so positioning in weak and complex si...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of the existing GNSS receiver system in weak signal and complex signal environments, the positioning performance is poor, and the existing A-GNSS technology is difficult to provide more auxiliary information and cannot effectively improve the tracking performance of the receiver, the present invention provides a Dual-antenna A-GNSS receiver system that can effectively improve receiver acquisition speed, tracking sensitivity and positioning performance

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