An Improved SMSP Jamming Method for LFM Radar

Abstract

The invention discloses an improved SMSP interference method for a linear frequency modulation radar, which belongs to the field of radar electronic confrontation. The method provided by the invention comprises the steps that a jammer receives a radar signal, and converts the signal into an intermediate frequency signal through the down frequency conversion of a mixer; the converted radar intermediate frequency signal is sent into an A / D converter through a low-pass filter, and is sampled through a high speed clock; radar pulse signals are grouped, copied and spliced into a complete radar pulse string, and the new complete radar pulse string is modulated; the modulated pulse undergoes D / A conversion, and then is sent into the low-pass filter; and a pulse jamming signal after low-pass filtering is up-frequency-converted through the mixer to the center carrier frequency of the radar and is emitted. According to the invention, a sub-pulse string cycle forwarding working mode is used; a sub-pulse string signal and the radar signal contain the same frequency modulation slope, and match the matched filter of the radar signal; and a false target can be generated on the radar receiving end for cheating.

Description

technical field [0001] The invention relates to an improved SMSP interference method aimed at linear frequency modulation radar, which belongs to the field of radar electronic countermeasures. Background technique [0002] Using radar to detect and strike targets is an important means of modern military. Radar is an electronic system whose purpose is to detect targets and measure their range, angle and velocity. Radar transmits radio frequency pulses through an antenna and calculates range by measuring the time between the transmitted pulse and the echo of the target detected by the radar receiver. With the rapid development of radar technology, the requirements for radar operating distance, resolution capability and measurement accuracy are getting higher and higher. We know that according to the resolution theory of radar signals, under the premise of ensuring a certain signal-to-noise ratio and achieving the best processing, the measurement accuracy and resolution have ...

AI Technical Summary

Problems solved by technology

This type of interference is formed by receiving, modulating and forwarding the radar signal based on the DRFM platform. It is composed of multiple sub-pulses, each of which is generated by sampling the received radar signal at intervals, so it can be received by the radar A large number of false targets are generated on the terminal, so that the radar cannot correctly detect the parameter information of the real target, which affects the detection of the real target

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