Segmented pulse pressure intermittent sampling and forwarding interference resisting method based on frequency agility radar

Abstract

The invention discloses a segmented pulse pressure intermittent sampling and forwarding interference resisting method based on a frequency agility radar, and the method comprises the steps: continuously transmitting a first preset number of pulse signals in each preset coherent processing interval; generating a plurality of first signals according to the signal corresponding to the linear frequency modulation item, and constructing a plurality of band-pass filters; receiving a first preset number of echo signals, wherein at least part of the echo signals comprise interference information; obtaining a first preset number of baseband echo signal vectors according to the echo signal, and filtering the baseband echo signal vectors by using a band-pass filter to obtain echo sub-pulse signal vectors; according to the first signal and the echo sub-pulse signal vector, obtaining an echo signal vector after segmented pulse compression, and determining an echo matrix after in-pulse accumulation; and performing coherent accumulation on the echo matrix after intra-pulse accumulation by using a two-dimensional sparse reconstruction algorithm to obtain a detection result of the target. The probability that the radar is interfered can be reduced, so that the accuracy of target detection is improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a segmented pulse pressure anti-intermittent sampling and forwarding interference method based on frequency-agile radar. Background technique [0002] In today's increasingly fierce electronic countermeasures, the electromagnetic environment faced by radars is becoming more and more complex, especially digital radio frequency memory (DRFM) makes interference more diverse. Usually, after DRFM intercepts the radar signal, it will delay, modulate and forward the signal to the radar. Since the interference signal is coherent with the radar transmission signal, after the pulse compression, false target deception interference will be generated in the distance dimension, which is an effective way for the radar. Detection poses serious challenges. [0003] In order to combat the interference of false targets, frequency-agile radars emerged as the times requir...

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Problems solved by technology

In the related technology, the frequency-agile radar transmits pulse signals with random jumps in the carrier frequency between pulses. When the interference forwarding delay is greater than one pulse repetition period, the carrier frequency of the interference signal no longer matches the local oscillator, so that the low-pass filter The energy of the interfering signal can be greatly suppressed when the device is used

[0004] However, the interference method of intermittent sampling and forwarding can partially sample the radar signal and quickly forward it, and generate coherent false target strings in the current pulse repetition period. In general, the energy of the interference signal is much greater than the energy of the target echo signal. The radar will misjudge the false target as the real target due to the strong interference signal energy, resulting in wrong detection results

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