Stepping frequency radar system based on chaotic signal source, and channel construction method thereof

Abstract

The invention discloses a stepping frequency radar system based on a chaotic signal source. The system comprises a signal emission module, a signal receiving module, the chaotic signal source and a data rearrangement module. The chaotic signal source generates chaotic signals, on one hand, controls the emission frequency sequence of an emission pulse string, and on the other hand, performs reordering control on echo signals received by the signal receiving module. The invention also discloses a channel construction method of a stepping frequency radar system. The method enables each chaotic signal sampling value to be corresponding to a group of frequency modulation sequences after normalization processing is performed on each chaotic signal sampling value, controls the signal emission module to emit pulse strings corresponding to the group of frequency modulation sequences, and controls the signal receiving module to rearrange signal echo vectors according to pulse frequencies in an increasing order. The method, on one hand, enables emission signals to be provided with higher anti-interference capability and lower interception probability, and at the same time, solves the problem of quite poor clutter inhibition capability of stepping frequency signals in a conventional stepping frequency system.

Description

technical field [0001] The invention relates to a frequency stepping radar system based on a chaotic signal source and a channel construction method, belonging to the field of radar communication. Background technique [0002] Chaos is a deterministic, random-like process that occurs in nonlinear systems. Chaos phenomenon also has noise-like characteristics, which can improve the confidentiality performance of communication systems. The chaotic signal can be accurately reproduced, used for chaotic masking in signal transmission, and used for signal recovery in signal reception. The basic idea of ​​chaotic secure communication is: use chaotic signal as the carrier of signal transmission, hide the transmission signal in the chaotic carrier, that is, the so-called chaotic cover, or endow different waveforms with different information sequences, so as to use correlation Attributes and characteristics, the transmitted signal is demodulated at the receiving end, which is the rec...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: aiming at the shortcomings of the background technology, the present invention proposes a step frequency radar system based on a chaotic signal source and a channel construction method, using the chaotic signal generated by the chaotic signal source to control the frequency of the step frequency. point, to realize the generation of random frequency hopping step frequency signal, that is, to generate the transmission signal randomly arranged by each frequency point of the step frequency, so that the transmission signal has stronger anti-interference ability and lower interception probability; solves the problem of existing The problem that the clutter suppression ability of the step frequency signal is poor in the step frequency system

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