Research On Sorting Algorithm Of Radar Signal Based On PRI PARAMETER

With the development of the radar technique,more and more new system radar have been developed and the rapid development of precision guidance technology,the electromagnetic environment is more and more complex.How to sort out each radiation source signal in real time in this complex electromagnetic environment is a big problem.In this paper,we mainly research the signal sorting algorithm and the sequence search algorithm:1.The paper analyses the electromagnetic environment of the radar.Carry out the simulation of signal source.Discuss the parameter for signal sorting and the types of pulse repetition interval(PRI).Fix on the scheme and guide lines of this thesis.2.The paper makes a study of traditional PRI sorting algorithm for radar signal.It makes emphasis on PRI sorting including Cumulative Difference Histogram(CDIF),Sequential Difference Histogram(SDIF),PRI transform algorithm and the modified PRI transform algorithm.In the case of large jitter,the CDIF histogram,SDIF histogram and the PRI transform algorithm cannot effectively estimate the PRI value.The modified PRI transform algorithm improves the problems of the PRI transform.When the jitter is as high as 10%,it can still correctly estimate the PRI value and it is suitable for common PRI modulation signals and can adapt to the current complicated electromagnetic environment.3.In the following section,the sequence search algorithm is studied,mainly including the direct sequence search algorithm and curve fitting sequence search algorithm,and the direct sequence search algorithm is improved to increase the retrieval speed by 50%.The method can completely retrieve the repetitive frequency signals,the curve fitting sequence search algorithm is improved to avoid the missed detection of a large number of pulses caused by poor fitting results and reduces the probability of wrong search4.Finally,a radar signal sorting demonstration system is implemented based on MATLAB GUI.Through this demonstration system,the process of PRI deinterleaving can be intuitively understood,so as to deepen the understanding of the concept of PRI sorting.The validity of the demonstration system is proved by testing the CDIF histogram,SDIF histogram and modified PRI transform method.