Radar Communication Integration Waveform Fast Design And Optimized Masking For MIMO Radar Signals

Radar waveforms play a very important role in radar systems,and they are an important part of whether accurate information about targets can be obtained during radar detection.In order to reduce the mutual interference and improve the frequency spectrum utilization rate,radar communication integrated signal is studied in this paper.In the research process,the single carrier integrated signal is designed,and the signal index is optimized through the chip modulation of the communication signal,so as to realize the radar function.Compared with the before work,this paper focuses on the fast optimization design method of integrated signal,and changes the integrated radar communication signal which needs offline optimization into the online transmission mode,so that it has a higher practicability.In the practical transmitting process of integrated signal,interference from enemy should also be considered.By analyzing received signals containing target or scene reflections,a radar system can extract interested information from the environment.In applications,the Electronic Attack(EA)device works in conjunction with the Electronic Service Method(ESM),which picks up signals in the space and identifies threats to its own side.The necessary information of the signal is transmitted to the EA device,which emits signals to interfere radar systems.High power jamming signals will form false targets in the radar receiver,even cause j amming and interrupt the normal operation of radar systems.Therefore,this paper studies the forward interference and an active Radio Frequency shield antijamming method.The main work in this paper can be summarized as:1.In order to study the integrated signal of single-carrier radar communication under the background of pulse radar,this paper proposes a method to quickly optimize the communication signal online to realize the radar function.In the radar transmitter,the integrated signal is obtained by applying convex constraint to the communication signal,and the level of autocorrelation Peak Sidelobe Level(PSL)is optimized by convex optimization algorithm.In the radar receiver,the signal is regarded as radar signal for pulse compression.In the communication receiver,an optimization bound is set according to the communication bit error rate to constrain the optimization process of integrated signal.Simulation results show that this method can improve the optimization speed of integrated signal significantly.2.In the background of Mutiple-Input Mutiple-Output(MIMO)radar,an active antijamming method is designed to protect radar signals against enemy ESM device.Masking signals can be transmitted in pulse mode or periodic continuous waveform mode.The masking signal will cover the radar signal in time domain and frequency domain,which makes it difficult for the enemy ESM device to distinguish the radar signal from the masking signal.In the radar receiver,the influence of masking signal on radar matching filter is suppressed by measuring its cross-correlation Integral Sidelobe Level(ISL)and PSL.The simulation results show that the masking signal with good cross-correlation sidelobe is orthogonal to radar signal in frequency domain.