Abstract
Based on the active interference suppression algorithm, this study combines the radar working mode and the interference type and realizes the effective detection of the flaw detection signal by successively processing the radar receiving signal and the filtering processing. Firstly, this article builds a simulation platform similar to the actual situation to verify the existing conventional active interference suppression algorithms. Secondly, for the detection of chirp active deception jamming signals entering from the main lobe, a radar active deception jamming detection method based on the characteristic parameter matching of the harmonic components of active deception jamming signals is proposed. After that, the spectral characteristics of the harmonic components of the deception interference signal are analyzed, and the center frequency and the tuning frequency of the real target echo are obtained. Finally, by establishing a frequency modulation parameter library for possible interference harmonic signal components, the acquisition phase of the radar gate by the jammer matched analysis with the preestablished frequency modulation parameter library is implemented to achieve active deception interference detection. This method can effectively detect active deception jamming signals in a complex tunnel environment. The interference suppression algorithms verified by simulation include noise FM interference suppression algorithm based on cancellation and distance false target interference suppression algorithm based on LFM radar summary processing. Through actual measurement data processing and analysis, the effectiveness of the method is verified and the idea of interference suppression is expanded. The construction of the simulation platform is obtained by appropriately modifying the actual parameters, a certain type of suppression jammer, and a certain type of deception jammer used in a certain countermeasure field test at a radar station.
Highlights
With the rapid development of microelectronics technology, the radar interference and interference countermeasures are becoming more and more diverse, and the processing is more complicated [1]. e most common passive interference is chaff interference, which can be filtered out by AMTI; in active interference, the common way of covering interference is noise interference
On the basis of combining the characteristics of the LFM signal, the pulses before and after the radar transmission signal are, respectively, added with approximately orthogonal disturbance phases, and the deceptive interference component in the composite interference is strengthened by the matched filter corresponding to the previous pulse repetition period, and the target echo signal is recovered by the inverse operation of matched filtering
Because the algorithm is intuitive to suppress compound interference and can use existing conventional interference suppression algorithms, the algorithm has certain practical value. e disadvantage of this algorithm is that the type of composite interference signal needs to be known
Summary
With the rapid development of microelectronics technology, the radar interference and interference countermeasures are becoming more and more diverse, and the processing is more complicated [1]. e most common passive interference is chaff interference, which can be filtered out by AMTI; in active interference, the common way of covering interference is noise interference. Radar active suppression jamming masks and suppresses the true target echo by radiating high-power noise or noise-like interference signals, resulting in the radar not being able to effectively obtain target information. E pulse compression technology is divided into two processing methods: time domain and frequency domain It interference suppression algorithm model model model model model model detection Vin. is processed in the time domain when a smaller pulse pressure ratio is required and in the frequency domain when a large pulse pressure ratio is required. E result is as shown in the text, and after the pulse compression, the target echo and the interference signal additional time delay have larger pulse pressure peaks, and the radar will not be able to distinguish the true target echo position. As the composite interference signal itself, the deceptive interference component and the suppressive interference component are both complementary and independent of each other. erefore, the suppressive interference signal does not have to completely cover the deceptive interference
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