Test method for consistency of positioning accuracy of satellite navigation signal acquisition and playback device

Abstract

The invention provides a test method for the consistency of positioning accuracy of a satellite navigation signal acquisition and playback device. The method uses a receiver as a test terminal, and uses positioning information recorded by the receiver during a direct test and a playback test as a basis, thereby avoiding the situation that the noise floods the navigation signal when the signal pre-and-post consistency in the time-frequency domain. The invention proposes two evaluation indexes: a first index that calculates the coincidence percentage of the 95% probability circles of the directtest and playback test positioning results; and a second index that calculates the statistical characteristics of distance deviations of the direct test and playback test positioning results; and theinvention measure the consistency of the original and playback signals to evaluate the performance of the acquisition and playback device in two forms of a relative error and an absolute error. The invention supplements the incomplete test method of the acquisition and playback device on the market, and provides a reference for the standardization establishment of the test method of instruments.

Description

technical field [0001] The invention belongs to the field of satellite navigation radio testing, in particular to a method for testing the consistency of positioning accuracy of a satellite navigation signal collection and playback instrument. Background technique [0002] At present, the satellite navigation and positioning technology represented by my country's Beidou and the United States' GPS (Global Position System, Global Positioning System) is developing rapidly, and the receiver technology is also developing accordingly. In the process of testing the receiver, according to the different test signal sources, the satellite navigation terminal test technology can be mainly divided into three types: signal simulator test, road test, and real signal acquisition and playback instrument test. However, because the existing technology of the simulator is still unable to provide an accurate and effective simulation model of the real complex scene of the navigation signal, the ...

AI Technical Summary

Problems solved by technology

However, because the existing technology of the simulator is still unable to provide an accurate and effective simulation model of the real complex scene of the navigation signal, the drive test cannot control the unification of the test variables and the cost is expensive, so the terminal test based on the satellite navigation signal acquisition and playback instrument is gradually promoted at this stage

[0003] Because the development of the satellite navigation signal acquisition and playback instrument is in the initial stage, the performance indicators of the equipment itself are not uniform, there is no fixed data output format, and there is no unified and perfect test method to evaluate the performance of the equipment

If we start from the satellite navigation signal to analyze the consistency between the original signal and the playback signal, because the satellite navigation signal is transmitted from space to the surface, the signal power is low, and the useful signal is submerged in the noise. It is difficult to establish a mathematical model to estimate the original signal and playback. The relationship between signal deviation in the time-frequency domain and consistency before and after playback

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