A method and device for detecting errors in spreading codes of multiplexed navigation signals

Abstract

The invention discloses a multiplexing navigation signal spreading code error detection method and equipment. The method comprises auxiliary information configuration and signal detection processing.The auxiliary information configuration comprises the following steps of synchronizing the local time of a monitoring receiver with the emission time of a navigation signal; initializing a code generator; and recovering the navigation message of a detection frequency point navigation signal in the monitoring receiver according to synchronized time. The signal detection processing comprises the following steps of generating 2<n> local reference baseband multiplexed signals; carrying out complex correlation operation on each locally-generated reference baseband multiplexed signal and a basebandsignal acquired through stripping a carrier wave from the received navigation signal, at the moment of zero clearing, multiplying an integration result by e<-jphi> and then taking a real part; findingthe maximum value of 2<n> results obtained in the previous step, and determining whether the local reference baseband multiplexed signal corresponding to the maximum value is a correct signal. In theinvention, the continuous real-time spreading code error monitoring of the navigation signal can be realized.

Description

technical field [0001] The invention relates to the field of satellite navigation signal quality monitoring and evaluation, in particular to a method and equipment for detecting errors in spreading codes of multiplexed navigation signals. Background technique [0002] In the field of satellite navigation technology, in order to achieve their own positioning, users need to accurately measure the distance between the satellite and the receiver. The accuracy obtained in this process is closely related to the quality of the navigation signal broadcast by the satellite. [0003] The downlink navigation signals of Beidou, GPS, and Galileo satellite navigation systems generally adopt the direct sequence spread spectrum system based on code division multiple access. The navigation signal includes an open signal and an authorized signal, wherein the spreading code of the open signal is a short code, which is periodic, and the length is between 1 ms and 10 ms; the spreading code of th...

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Problems solved by technology

[0008] 4) The spreading code of the authorized signal has no periodicity, and it is impossible to perform accumulation processing of multiple code periods

The disadvantage of the first method is that only qualitative results can be obtained. If there is an abnormality, it is impossible to quickly determine which signal is the problem, and only limited fragments can be analyzed for authorized signals; the second method can fully analyze open signals. It can identify the error bits that are stably recurring during the pseudo code generation process, but cannot detect and analyze the authorized signal

The common disadvantage of these two methods is that they cannot continuously monitor the occurrence of spreading code errors in real time, and are only suitable for offline processing afterwards.

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