Delay-Doppler deconvolution image formation for multiple targets in waveguide environment  

作　　者：ZHAO Hangfang LI Chunxiao GONG Xianyi ZENG Xiaohui 

机构地区：[1]College of Information Science and Electronic Engineering,Zhejiang University [2]Key laboratory Ocean Observation-Imaging Testbed of Zhejiang Province [3]College of Mechanical Engineering,Zhejiang University of Technology [4]Hangzhou Applied Acoustics Research Institute

出　　处：《Chinese Journal of Acoustics》2017年第4期473-488,共16页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(61379008)

摘　　要：The ranges and radial velocities of targets are interesting parameters in the active sonar, which can＇t be observed directly but can only be estimated. Firstly, by making use of the delay-Doppler model of multi-targets in waveguide multipath environment, one finds that sample cross-ambiguity function is a two-dimensional（2D） convolution of the auto-ambiguity function of the transmitted signal with the generalized target reflectivity density, which is a 2D convolution of the spread function of channel with the reflectivity density as well. Secondly,from the perspective of information theory, an iterative deconvolution algorithm named R-L（Richardson-Lucy） is derived based on minimum Csiszar discrimination criterion. Finally, the blurs caused by both of the transmitted signal and channel are removed by 2D deconvolution of the expectation of sample cross-ambiguity function, 2D image and then parameters of time-delay and Doppler is estimated sequentially. Results of both numerical simulation and sea experimental data processing verify the feasibility and effectiveness of R-L deconvolution algorithm, which effectively improves the resolution and precision of the time delay and Doppler estimation, when compared to the classical match filtering and Wiener filtering.The ranges and radial velocities of targets are interesting parameters in the active sonar, which can＇t be observed directly but can only be estimated. Firstly, by making use of the delay-Doppler model of multi-targets in waveguide multipath environment, one finds that sample cross-ambiguity function is a two-dimensional（2D） convolution of the auto-ambiguity function of the transmitted signal with the generalized target reflectivity density, which is a 2D convolution of the spread function of channel with the reflectivity density as well. Secondly,from the perspective of information theory, an iterative deconvolution algorithm named R-L（Richardson-Lucy） is derived based on minimum Csiszar discrimination criterion. Finally, the blurs caused by both of the transmitted signal and channel are removed by 2D deconvolution of the expectation of sample cross-ambiguity function, 2D image and then parameters of time-delay and Doppler is estimated sequentially. Results of both numerical simulation and sea experimental data processing verify the feasibility and effectiveness of R-L deconvolution algorithm, which effectively improves the resolution and precision of the time delay and Doppler estimation, when compared to the classical match filtering and Wiener filtering.

关 键 词：WAVEGUIDE REFLECTIVITY multipath discrimination iterative AMBIGUITY convolution SONAR WIENER filtering 

分 类 号：TB56[交通运输工程—水声工程] TP391.41[理学—物理]