| With the development of radar technology,radar anti-interference requirements are becoming increasingly higher.In order to verify its anti-jamming performance,radar echo simulator has been widely used.Ordinary radar echo simulator is only for radar with fixed radio frequency,superimposed interference and generate echo signal,because its interference form is simple,radar can easily search for targets.In order to effectively improve the anti-jamming performance of radar,a complex interference simulator was designed and a signal deinterleaving and interference subsystem were designed on the basis of the system.The main tasks are as follows:First,according to the design requirements and the technical specifications of the system,the overall design of the complex interference simulator system is performed.The simulator system is composed of display control unit,baseband unit and microwave unit,and design the simulator's external interface,together with other equipment and instruments to form a common laboratory simulation system.Secondly,based on the design of complex interference simulator,a signal deinterleaving mode is designed to enable the simulator to face radar signals with unknown radio frequencies.By analyzing the deinterleaving parameters and methods needed in the deinterleaving process.Aiming at the advantages and disadvantages of the sequential difference histogram,this paper proposes an improved sequential difference histogram method which is applied in the complex interference simulator,and the signal deinterleaving software design is based on this algorithm.Thirdly,based on the design of complex interference simulator,in order to realize the diversification of interference patterns,interference subsystem are designed.The system includes cheating interference,suppression interference,mixed interference and time-division multiplexing interference.The velocity gate pull-off,range gate pull-off,multi-false target interference,doppler flickering in cheating interference are studied and simulated.Among them,a software algorithm is implemented for velocity gate pull-off and doppler flicker interference.The continuous noise interference,intermittent noise interference,function slide noise interference,and comb spectrum interference in the suppression interference are studied and simulated.Based on cheating interference and suppression interference,mixed interference and time-division multiplexing interference are designed in software.Finally,the simulator system is tested,the main test content is the signal deinterleaving results and interference effects,and the spectrum and time domain diagrams of the test are analyzed.According to the test results,each indicator meets the requirements of the indicators,which can realize the signal deinterleaving and the interference effect increases. |
PDF Full Text Request