Multi-radar countermeasure method and system based on virtual channelization

Abstract

The invention relates to a multi-radar countermeasure method and system. The method comprises the steps of carrying out the frequency division of a received radar radio frequency signal, obtaining a frequency division intermediate frequency signal after the frequency division of the received radar radio frequency signal and a frequency division local oscillator signal, carrying out the frequency detection of the pulse front edge of the frequency division intermediate frequency signal, and obtaining a pulse starting frequency; performing broadband and narrowband judgment on the frequency division intermediate frequency signal of the radar signal to obtain a broadband and narrowband judgment result of the broadband signal or the narrowband signal; calculating the center frequency of the broadband signal for the broadband signal according to the broadband and narrowband judgment result; determining a local oscillation signal frequency range of the narrow-band signal according to the pulsestarting frequency and switching to the corresponding local oscillation signal according to the broadband and narrowband judgment result; for the broadband signal, determining the frequency range ofa local oscillation signal according to the center frequency of the broadband signal and switching to the corresponding local oscillation signal; and mixing the local oscillator signal and the radar radio frequency signal to generate an intermediate frequency radar signal, and generating a radar interference signal according to the intermediate frequency radar signal.

Description

technical field [0001] The invention relates to electronic radar countermeasure technology, in particular to a multi-radar countermeasure method and system based on virtual channelization. Background technique [0002] With the development of high-resolution broadband imaging radars, networked radars, dual multistatic radars and distributed coherent radars, the working modes and signal forms of radars are diversified, which makes the electromagnetic environment faced by active electronic interference more and more serious. complex. [0003] Traditional jamming countermeasures are insufficient in countering multiple radars. For example, multi-radar countermeasures generally use channelized detection to guide local oscillator selection. In this method, each channel covers a certain frequency band. In order to deal with multi-radar, the general channel coverage bandwidth is relatively narrow, about 100MHz or less, so multiple channels are required to cover the entire frequency...

AI Technical Summary

Problems solved by technology

Therefore, multiple channels need to be set up, resulting in an increase in overall complexity

And when the signal frequency is between adjacent channels, both channels will output detection, or the high level of detection will fluctuate between the two channels, so the local oscillator selection based on channel detection will be unstable.

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