Near-field Localization With Compressed Sensing Based On Large Virtual Aperture

At present,the passive localization technology of emitter based on satellite is mainly divided into Angle of Arrival(AOA)localization and Time Difference of Arrival(TDOA)localization.AOA localization is greatly affected by the signal-to-noise of emitters.And when the signal-to-noise is low,the localization accuracy is not high.TDOA localization requires the establishment of a specific data fusion center to analyze and process localization information,and is limited by time synchronization,inter-satellite networking and data interaction,so it is complicated and costly.This paper draws on the super-synthesis technology and uses the sparse characteristics of emitters,and proposes near-field localization with compressed sensing based on the virtual large aperture.In this method,a larger aperture of the array is synthesized by the high-speed motion of the satellite around the earth,which makes the measurement of emitters from far-field to near-field.Therefore,the high localization accuracy of emitters based on single satellite is obtained.This paper first introduces the theoretical of super-synthesis technology and compressed sensing in detail.Secondly,the near-field localization with compressed sensing based on virtual large aperture is theoretically analyzed and modeled.And the effectiveness of the method is verified by simulation and prototype experiment.Simultaneously,the localization accuracy of AOA localization and the near-field localization with compressed sensing based on virtual large aperture are simulated and compared.Thirdly,a series of experimental discussions were carried out on the optimal design of the system.Finally,the non-ideal characteristics of the system are analyzed,and the effects of channel error,antenna pattern error,antenna mutual coupling error and antenna position error on the localization performance are discussed.At the same time,the corresponding correction method is provided for the partial error model,and the simulation and prototype experiment are carried out.