Detecting and analyzing method for multi system frequency shift key control signal

Abstract

This invention relates to automatic identification to communication signals and analysis technology aiming at testing and analyzing multi-bit frequency shift key controlled signals characterizing in comparing the mean value of the absolute value of the variance rate sequence of the normalized instant frequencies with the set threshold value to judge MFSK signal, when analyzing, Smooth filtration is used in reducing shake of the MFSK signal transient frequency then the entropy principle is used in analyzing the histogram for the distribution of transient frequencies to estimate the state number of code elements and frequency sphere with an equal probability distribution principle then to use the equal frequency distance to get more accurate code element state number, frequency sphere and central frequency.

Description

technical field

[0001] The invention belongs to the field of communication signal analysis, in particular to automatic identification and analysis of multi-ary frequency shift keying (MFSK) signals in digital modulation modes. Background technique

[0002] Automatic identification of modulation mode is an important link in applications such as electronic warfare (communication reconnaissance), radio monitoring, and adaptive communication. It is also an important topic in the field of non-cooperative communication. Various theories of communication signal analysis have been widely used in this direction. Frequency shift keying modulation (FSK) plays an important role in shortwave / ultrashort wave communication and amateur radio communication of the army and government. It is an important digital signal modulation method. The detection and analysis of this type of signal is a radio signal monitoring And the important content of military communication reconnaissance. The invent...

Images