Research On Phase Assisted Target Detection And Localization Technology

The development of the Internet of Things and industrial intelligence promotes the rapid growth of the demand for high-precision target detection and positioning.Phase-based interferometric ranging technology can obtain good ranging accuracy by transmitting and receiving signal phase difference information,and it does not depend on signal bandwidth.This paper focuses on the problem of high-precision ranging in target detection,and in-depth researches on the AMCW high-precision ranging method based on envelope phase lock and a high-precision unambiguous ranging method based on dual-frequency LFM,and the actual measurement is carried out based on the software radio platform.verification.The main research contents of this paper are as follows:1、First,it explains the research background and significance of this article.Second,it summarizes the domestic and foreign research status and application scenarios of traditional detection signals to achieve high-precision ranging;and briefly introduces the basic principles,advantages and disadvantages of ranging.Finally,the theoretical ranging accuracy of different ranging methods is summarized and analyzed.2、Aiming at the problem that the ranging accuracy of the AMCW signal decreases under the condition of low signal-to-noise ratio,an envelope-locked AMCW high-precision ranging method is designed.The single-frequency envelope signal of AMCW contains distance information,and the phase-locked loop has narrow-band filtering characteristics and good tracking characteristics,which can capture and track noise-containing envelope signals and reduce the influence of noise.Compared with the original AMCW,this method shows better robustness under low signal-to-noise ratio.Finally,the software radio platform was tested in different actual scenarios,which verified that the method can effectively improve the accuracy of the system’s ranging.3 、 Aiming at the problem of phase ambiguity in FSK radar,a high-precision,unambiguous ranging method based on dual-frequency LFM is designed.This method uses the LFM signal pulse pressure to obtain another dimension of the coarse distance value,decoupling the fine distance of the FSK phase ranging to ensure high-precision ranging while removing the phase ambiguity,and analyzes the dual-frequency LFM high Constraint relations among the parameters of the precision ranging system.Finally,simulation and system implementation verify that the method can solve the problem of FSK radar phase ambiguity.4、This paper summarizes the main content and innovation,and gives the direction of further research and engineering implementation of this topic in the future.