Satellite navigation receiver interference detection method based on statistical characteristics of data

Abstract

The invention relates to the technical field of satellite navigation, and discloses a satellite navigation receiver interference detection method based on statistical characteristics of data. The method comprises the following steps of setting a false alarm probability Pfa of a receiving terminal according to the user requirement; performing initialization processing on the data collected by the receiving terminal AD; taking N data from the data collected by the receiving terminal AD, and counting the number of times Ok of the data falling into each subset interval Ak; calculating detection statistic; comparing the detection statistic with a decision threshold, determining that there is interference if T(x) is greater than or equal to Tth, and determining that there is no interference otherwise. The satellite navigation receiver interference detection method based on statistical characteristics of data provided by the invention is insensitive to interference types, can detect all typesof interference signals, has the advantages of low computational complexity, high detection sensitivity, etc., and can be used for providing a basis for reliability determination of receiving terminals, especially core equipment operation results, and further interference suppression processing.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an interference signal detection method applied to a satellite navigation receiving terminal. Background technique [0002] At present, the satellite navigation system has been widely used in military and civilian fields. It can provide services such as navigation, precise positioning, time reference and time synchronization of key equipment, and has created huge economic and social value. From the perspective of satellite navigation receiving terminals, radio frequency interference is still one of the main reasons for the deterioration of system service performance. Since the satellite signal reaching the earth's surface is extremely weak, it is usually submerged in noise, and the receiving terminal is very sensitive to interference. An interference signal with a transmission power of 1W can make the receiver within a few kilometers unable to work normally. In term...

AI Technical Summary

Problems solved by technology

These methods mainly have the following shortcomings when applied to satellite navigation receiving terminals: first, they can only detect some specific interference types, for example, the FFT-based frequency domain interference signal detection method is not good for broadband interference detection; second, the computational complexity is high, The demand for logic resources and power consumption of the circuit is large; the third is that the detection sensitivity is not high, and the detection effect of interference with power less than thermal noise is not good.

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