Key Technologies Of Distributed Electronic Reconnaissance

Electronic reconnaissance is an important part of electronic warfare,and signal sorting is an important part of electronic reconnaissance.With the increase of radar signal types and the complexity of radar parameter changes,it is a very difficult problem to separate useful signals from unwanted signals or to separate the concentrated interleaved useful signals.In this thesis,the signal sorting method based on a single station is first studied,and then the signal sorting of a single station is prone to target batch increase and batch miss.The sorting problem is that the signal is missed due to missing pulses.Furthermore,the joint sorting algorithm of time difference and other multi-parameters is studied to overcome the sub-harmonic phenomenon of traditional sorting,and a complete system implementation method is given.The main work of this thesis is as follows: 1.This thesis first analyzes the histogram method and Pulse Repetition Interval(PRI)transformation method in the traditional radar signal sorting algorithm,and analyzes their advantages and disadvantages.2.Aiming at the problem of sub-harmonics appearing in the histogram and the PRI transformation,it is not possible to sort all system signals.The idea of multi-station cooperative signal sorting is adopted.The two-station collaborative algorithm based on time difference is studied.The principle of the multi-station sorting method using time-difference parameters is used to sort the signals according to the time difference between the pulses arriving at the reconnaissance receiver at different positions.The robustness of the time difference determines that this method is superior to the single station.Theoretical and simulation results show that the different system pulses of different radiation sources in the received signal are correctly separated.Further,in view of the problems of false time difference and sorting blur in the sorting process of two stations,the signal sorting based on three stations was studied.The simulation results show that the multi-station cooperative signal sorting based on time difference can remove the false time difference,and at the same time,the algorithm can recover some missing pulses during the sorting process.3.The multi-station sorting method based on the time difference,although the calculation is simple and the operation is fast,for the case where the two targets are close to each other,the time difference is not much different,and there is an error,it may be mistakenly sorted as a target,and two-station sorting Select the fuzzy area in the sorting situation.Therefore,this thesis proposes a pre-sorting method for joint sorting of time difference and multi-parameters.The parameter matching relationship of other radar parameters such as time difference and pulse width between different pulses is studied to carry out pulse pairing pre-sorting,and then the type of pulse repetition period is identified for the signal.Simulation proves that this method can solve the sorting fuzzy phenomenon of different system targets in close range.