Method for monitoring signal quality by adopting multichannel parallel correlation peak sampling mode

Abstract

The invention provides a method for monitoring the signal quality by adopting a multichannel parallel correlation peak sampling mode, and belongs to the field of satellite navigation. The method comprises the following steps of: determining the number of sampling points based on a sampling frequency and the number of channels of a receiver according to an actual monitoring task demand of a user; then detecting a satellite to be monitored by adopting the multichannel parallel correlation peak sampling mode, acquiring correlation peak sampling values, and fitting the acquired correlation peak values; and acquiring a detection statistic of every two symmetric sampling points, and monitoring the correlation peak quality of a signal in real time by adopting a weighted difference method according to the detection statistic of every two symmetric sampling points. Hardware facilities are not required to be changed, and the method is suitable for satellite bands; only aiming at detection of a satellite signal, all channels are set according to the satellite signal; due to a plurality of channels for sampling, the sampling rate is increased because of the advantage that the time is replacedwith the space; furthermore, the quality of the satellite signal is detected, and the cost is saved.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and specifically refers to a signal quality monitoring method applied to a satellite navigation system. Background technique [0002] For satellite navigation systems, integrity means that when the system fails or a certain operating parameter deviates too much, or due to the comprehensive influence of multiple factors in the system, the positioning results provided by the system exceed the specified limit, and the system promptly finds out and responds accordingly. The ability to notify users in a timely manner. [0003] The satellite navigation system itself can perform a certain degree of integrity monitoring, but the alarm time is too long (usually several hours), and the integrity information is single, which cannot meet the needs of most users. At this stage, the integrity is mainly enhanced through external ground monitoring. Typical systems are the Wide Area Augmentation System (WAAS ...

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Problems solved by technology

[0010] Aiming at the problems of low code ring sensitivity and increased economic investment when narrow correlation technology is used for multi-point sampling of correlation peaks in existing satellite signal quality monitoring, the present invention proposes a multi-channel parallel correlation peak sampling monitoring signal quality Methods

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