An Active Detection Method for Buried Target Based on LFMCW Waveform

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Yue, Lei^1

Kunming Shipbuilding Equipment Research and Test Center, Kunming, Yunnan

650051, China^1

关键词: Ambiguity function;    Analysis and simulation;    Clutter suppression;    Fractional Fourier transforms;    Linear frequency modulated continuous wave;    Time-frequency distributions;    Waveform designing;    Waveform parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/2/022079/pdf
DOI  :  10.1088/1755-1315/170/2/022079

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Underwater clutter is the main interference for active sonar to detect buried target. Anti-clutter waveform designing and processing method play a significant role in clutter suppression. This paper proposes a processing framework for detecting buried target. The linear-frequency-modulated continuous wave (LFMCW) signal is selected as the detecting waveform, and the properties of time-frequency distribution, spectrum, periodic fractional Fourier transform (PFRFT) and wideband ambiguity function (WAF) for LFMCW are analysed, then the waveform parameters is designed to well detect buried target. Furthermore, on the basis of PFRFT and WAF, this paper proposes a processing method for LFMCW. Both the theoretical analysis and simulation results validate the proposed method. Sine-square weighted LFMCW outperforms the rectangular weighted one.