High precision GNSS receiver

Abstract

The invention relates to a high precision GNSS receiver, which comprises a levorotatory and dextrorotary circular polarization antenna, a first radio frequency front end module and a second radio frequency front end module with a local clock, a signal following module and a CPU. The signal following module comprises a satellite capturing unit, a first satellite following unit, a second satellite following unit and an interface unit. A capturing control module, a text demodulation module, two loop following modules, two initial data measuring modules, an availability choosing module, a position resolving module and an interface protocol module are arranged in the CPU. The availability choosing module obtains the pseudo range and the carrier-to-noise ratio data of levorotatory signals and dextrorotary signals, analyzes and chooses the weak initial data of multipath signals and transmits to the position resolving module for final position resolving. The invention compares and analyzes the levorotatory signals and the dextrorotary signals, alleviates the multipath influence on data source, ensures the GNSS receiver obtains high position precision, can improve the multipath influence alleviating effect based on the traditional multipath alleviating technology, has strong structural expansibility and can realize flexible framework configuration.

Description

technical field [0001] The present invention relates to a satellite navigation receiver, in particular to a high-precision GNSS (Global Navigation Satellite System) receiver. Background technique [0002] GNSS receiver is a positioning device that uses the time of arrival (TOA) ranging principle in satellite navigation technology to determine the position of the receiver. Satellite navigation and positioning technology uses receivers to measure the time it takes for a received signal to arrive at the receiver from a GNSS satellite whose location is known, and multiply the propagation time by the speed of light to obtain the distance from the GNSS satellite to the receiver. Since this distance contains many error terms, it is called pseudorange. [0003] In order to determine the three-dimensional position of the receiver and the local time, it is necessary to measure the pseudo-ranges from four or more satellites to the receiver, and obtain four or more simultaneous equatio...

AI Technical Summary

Problems solved by technology

[0015] 1. Narrow correlation technology is at the expense of increasing the chip rate, that is, shortening the chip width of the correlator, which not only increases the processing complexity of the GNSS receiver, but at the same time, because the chip width cannot be too narrow, the narrow correlation technology increases the chip width. The speed requirements are contradictory, so there is a limit to the narrow correlation technology to eliminate multipath effects;

[0016] 2. Due to the limited performance of narrow correlation technology in alleviating the impact of multipath, other methods need to be used to supplement, such as multipath elimination (MET) technology and pulse aperture correlation (PAC) technology, etc., but multipath elimination technology and pulse aperture correlation technology are in the The performance of mitigating multipath effects needs to be improved

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