Radar Detection Algorithm For Weak Target Based On Radar-communication Integrated Waveform

With the rapidly development and widely application of various electronic technologies,radar and communication technologies have been made great progress.However,combat platforms need to be equipped with a variety of electronic systems and equipment,integration and performance of the systems are demanded increasingly.And the environment of electronic countermeasure has been become more and more complex.At the same time,the increasing demand of data has exceeded the transmission capacity of the existing data chain.Therefore,Radar-communication integrated is one of the future integrated electronic system solutions.The design and selection of radar-communication integrated waveform is the foundation of radar-communication integrated system,which directly affects the signal processing mode and system performance index.The realization of radar-communication integrated can improve the system and spectrum utilization,and is beneficial to the networking and automation of the integrated electronic system.Radar-communication integrated waveform is studied in this paper,which is used to detect weak targets,the high efficiency communication rate and radar detection performance of the integrated waveform need to be satisfied.The design and simulation of radar-communication integrated waveform based on spread spectrum technology were carried out to study the performance of radar-communication integrated waveform,and the reliability and effectiveness of its practical application.This paper analyzes the modulated communication data based on the general radar waveform,realizes the optimization of integrated waveform,and looks for an effective method to detect weak targets.The design of radar-communication integrated waveform is related to the performance of the whole system.Radar-communication integrated waveform detection for weak targets as the research direction of this paper.The main work includes:1.The research background,significance and development status of radarcommunication integrated waveforms are described.Integrated waveform is great significance for improving radar detection performance and developing radar detection technology.There are many methods for long time accumulation of target echoes,which are usually classified according to whether the phase information of radar echoes be used or not.There are a variety of detection algorithms for weak targets,including the correction of across range unit,across doppler unit,across beam unit and other problems.2.Studied the signal accumulation detection algorithm of DSSS-2DPSK-RFT.Based on the research and analysis of radar signal and communication signal,the integrated DSSS-2DPSK signal is designed.MTD and RFT are adopted when the integrated signal is used for weak target detection.After theoretical derivation and comparison,theoretical deduction is verified by simulation experiment.3.Studied the signal accumulation detection algorithm of DS-CSS-RFT.Chirp signals are insensitive to Doppler,and has good autocorrelation characteristics,and easy to be achieve greater bandwidth.It is a common radar signal with low probability of interception.Because DSSS-2DPSK integrated signal has Doppler sensitivity,then DS-CSS integrated signal is designed,and the weak target detection performance of DS-CSS-MTD and DS-CSS-RFT are compared through simulation experiment.4.Studied the signal accumulation detection algorithm of SS-OFDM-IAR.In order to improve the communication data transmission rate,the OFDM integrated signal based on spread spectrum is designed.Keystone and IAR are used to detect weak targets,and simulation results are given.Experiments show that across range unit can be compensated,the energy loss be reduced after coherent accumulation and the accumulation gain be improved of SS-OFDM-IAR.