Research On Multi-target Angle Estimation Of MIMO Sky-Surface Wave Radar

The MIMO sky-surface wave radar system has the feature and advantage of the HF hybrid sky-surface wave radar and the MIMO system radar.Based on the multiple channel and non-causal transmit beamforming techniques,the MIMO radar architecture can provide a feasible approach for solving the multipath effect,multi path effect and Doppler-spread clutter in Over-the-horizon Radar.In this paper,the MIMO technology is combined with the hybrid sky-surface wave radar system are combined to construct a new system radar model with sky-wave over-the-horizon and MIMO combined,and the application effect of multi-objective angle estimation algorithm under this system is simulated.This paper describes the working principle of the MIMO sky-surface wave radar,studies the signal model and signal processing technology of the MIMO sky-surface wave radar.In addition,deduces the multi-objective angle estimation algorithm of the MIMO sky-surface wave radar based on the MUSIC algorithm,WMUSIC algorithm and the ESPRIT algorithm,and the effectiveness and accuracy of these algorithms in the target azimuth estimation of the MIMO sky-surface wave radar are verified by simulation.In view of the fact that the MIMO sky-surface wave radar can perform multi-target detection,this paper attempts to apply adaptive techniques such as Capon,APES,and CAPES to estimate the target parameters in a MIMO sky-surface wave radar system.Firstly,the relevant algorithm formulas are deduced for this system,and then computer simulations are performed.The results show that these algorithms are feasible in this radar system.Finally,the design of radar emission waveform is preliminarily discussed,replace omnidirectional transmissions with a signal that is close to the ideal beam.The omnidirectional signal detection target is first emitted,the target position is estimated using the GLRT algorithm,then the ideal beam is determined according to the target position,and the transmission signal is then designed so as to approach the ideal beam.Through computer simulations,it was demonstrated that this transmitted signal has better resolution.