Research On Inversion Technology Of Function And Performance Parameters Of Multi-function Radar

With the development of science and technology modernization,the appearance of the battlefield has undergone fundamental changes.The focus of modern military warfare has shifted to the electronic countermeasure technology in electronic warfare.As the core equipment of electronic warfare,multi-function radar has been gradually developed with the support of active phased array technology,which has the characteristics of beam pointing agility,waveform parameters agility and complexity,and various functions.In the complex battlefield environment,the use of electronic reconnaissance technology to analyze and identify the behavior of multi-function radar can provide behavioral intelligence support for electronic countermeasures equipment to implement electronic attack and electromagnetic interference on multi-function radar and help the reconnaissancer to obtain the opportunity in electronic warfare.The inversion of the work mode of the multi-function radar can only provide the behavior information to support the reconnaissance in a short time.The function has a longer time than the work mode and can reflect the behavior of multi-function radar more abstractly than work mode.The performance parameters embody the performance of the corresponding behavior of multi-function radar based on the function.The inversion of function and performance parameters can provide more specific and comprehensive behavioral intelligence for the reconnaissance.Therefore,based on the multi-function radar signal detected by the reconnaissance receiver,this thesis mainly studies the method of function and performance parameter inversion of multi-function radar.The main contributions of this thesis are as follows:(1)To solve the problem that the function internal work mode transfer is complicated,and the function sequence has a long time sequence,which is difficult to apply to the work mode recognition method,firstly,a multi-level model and pulse interception model of multi-function radar are constructed,and the word vector representation method of function sequence is studied,which effectively reduces the influence of measurement errors on function sequence parameters.At the same time,the function inversion model of the CNN-GRU network in a non-ideal electromagnetic environment is constructed to improve the accuracy of functional inversion in a non-ideal electromagnetic environment.(2)Aiming at the inversion of antenna performance parameters through amplitude information,firstly,the signal model of reconnaissance reciver was analyzed,the radar amplitude information sequence received by reconnaissance reciver was constructed,and the autocorrelation function and difference analysis method for amplitude sequence were studied.Then,the model of primary and secondary wave bit sequence extraction based on the connected domain detection is constructed,and the inversion method of antenna scanning mode based on SVM is studied.Finally,the amplitude sequence similarity comparison model is constructed and the antenna array inversion method for confidence evaluation is studied.High accuracy inversion of antenna performance parameters is realized.(3)Aiming at the detection performance parameter inversion problem of multifunction radar,firstly,the relationship between the received signal power of reconnaissance reciver and the transmitted signal power of radar is constructed,and the influence of reconnaissance aircraft on signal power estimation under different signal-tonoise ratio and signal characteristic parameter error is studied from the reverse perspective.At the same time,combining the signal characteristic parameters extracted by reconnaissance reciver,the radar echo signal is reversely reconstructed.The gain and signal-to-noise ratio of pulse compression and moving target detection of reconnaissance reciver under different signal-to-noise ratio are studied to realize the inversion of detection performance parameters of multi-function radar.