Research On Receiving Technology Of Radar Embedded Communication

Radar embedded communication is a covert communication technology developed in recent years.Because of its low probability of interception and low probability of detection performance,the technology has received people's attention.At present,the analysis and research of radar embedded communication are mainly based on the additive Gaussian white noise channel.In this paper,we focus on the problem of how to resist multi-path fading and improve the reliab ility of communication under the multipath fading channel.We study the time reversal technique,the equalization technique and the RAK E receiving technology,and combine the radar embedded communication system Framework,and then these technologies are made appropriate improvements and design applied to the system.In this paper,we study that how the tag is effectively triggered and non-cooperative radar case how to receive radar signals to generate hidden communication waveforms and other practical problems.At the label,we propose a radar extraction technology based on array processing,analyze and verify the feasibility of the application,and ensure the premise of the system waveform design.The main work and innovation of this paper are as follows:1.This paper addresses the reliable reception problem of radar embedded communication system under multipath fading channel.The method of receiving technology based on equalization technology is put forward.Combining with the specific structure of radar embedded communication system,the equalizer is improved.At the same time,the method of de-correlation reception based on RAK E is proposed.Theoretical analysis and simulation experiments show that these technologies can effectively improve the reliability of radar embedded communication.2.In the actual application scenario,how the tags are effectively triggered and how the tags generate Communication waveform in the case of non-cooperative radar.The radar waveform extraction technology based on array processing is proposed,and the DOA estimation technique and beamforming technology are studied to ensure that the tag is correctly extracted from the radar waveform to facilitate the realization of concealed communication.3.Aiming at the problem of DOA estimation of coherent sources in radar waveform extraction technology,the smooth MUSIC algorithm and the RISR algorithm based on MMSE are studied.The RISR algorithm based on LS model is proposed,which simplifies the computation of RISR algorithm and improves the accuracy of direction estimation.