Research On Radar Signal Sorting Algorithm In Complex Electromagnetic Environment

With the continuous development of radar technology and the continuous advancement of radar signal modulation technology,the electromagnetic environment has become increasingly complex: in addition to the pulse signal emitted by the radar,there are a lot of other interference signals such as clutter,noise,etc.in the electromagnetic signal existing in space;low The rapid development of intercept probability radar has caused a large number of pulses captured by the receiver to be lost;a large number of radar applications in various industries around the world have made the distribution of electromagnetic signals in space highly dense;the widespread use of new radar systems has caused the bandwidth occupied by radar signals to continue to expand;The parameters between various radar pulse signals in space are staggered.The increasing complexity of the electromagnetic environment has increased the challenges of radar signal sorting,and sorting has become increasingly difficult.How to sort out enemy threat radar signals from a complex electromagnetic environment,this article has done the following researches:(1)Analyze the electromagnetic environment of radar signal sorting in detail,and discuss the influence of modern and more complicated electromagnetic environment on radar signal sorting field The important parameters used for radar signal sorting and the pulse descriptor PDW describing the radar signal are introduced,and several common common parameters such as fixed PRI,jitter PRI,inter-pulse staggered PRI,pulse group staggered PRI,and slip PRI are analyzed.The characteristics of radar signal pulse repetition period,on this basis,introduces the basic process of radar signal sorting,including pre-sorting and main sorting.(2)In order to simulate the complex electromagnetic environment,ten different types of radars are designed to be mixed together in the simulation experiment,fully considering the concurrency degree of multiple radar signal patterns,the degree of pulse aliasing,the low probability of interception,and noise interference.The simulated signal The complexity is far more than the actual data collected by reconnaissance equipment.(3)Unknown radiation source sorting plays a very important role in modern warfare.It intercepts the pulse signal of the enemy radar in the electromagnetic space and deinterferences and deinterleaves it to obtain the equipment parameters and operating characteristics of the enemy radar.The war provides real-time support and reliable intelligence,reduces casualties,and even determines the outcome of the war.However,with the development of radar technology,the radar system has become more complicated and diversified,and battlefield weapons and equipment have also been developed to information technology,which has made the electromagnetic signal environment faced by radar countermeasure systems more and more complex.In the complex electromagnetic environment,it is imminent to develop a new algorithm for sorting unknown radiation sources.This paper presents a new sorting method for unknown radiation sources.The sorting pulses are cleaned first,and then they are classified by carrier frequency,pulse width and angle of arrival.PRI analysis is performed on each classification result.Determine whether the PRI analysis results of each cluster can be fused to form a new radiation source.On the simulation data,the sorting accuracy of the algorithm is 97.9%,which can fully meet the actual needs.(4)Because the radar signal sorting method for unknown radiation sources needs to divide the pulse file when processing a large amount of pulse data,it needs to split the pulse file,which leads to batch increase problems,and the unknown sorting cannot effectively use the prior radar of the known library.Knowledge,this paper proposes a sorting based on known libraries and a sorting algorithm that fuses unknown radiation sources and known libraries.That is,first use the knowledge of the known library to perform signal dilution on the input pulse sequence,identify and save the pulse signal emitted by the radiation source from the input pulse sequence,and then sort the unknown radiation source from the diluted signal.Experimenting on the algorithm on the simulation data,the accuracy of the library sorting is known to be as high as 99.52%,and the new algorithm can effectively solve the problem of increasing batches that cannot be solved by conventional sorting,and can still effectively improve the sorting rate and accuracy.