Range-spread target detector via coherent energy accumulation and block thresholding denoising

• 作者: ZHANG Yunjian PAN Pingping DENG Zhenmiao WU Gang
• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: SYSTEMS ENGINEERING
• 页码范围: 873-880
• 页数: 8页
• 语种: 英文
• DOI: 10.23919/JSEE.2021.000075

摘要

A range-spread target (RST) detector is proposed for wideband radar. The detector, referred to as a conjugate multi-plication and block thresholding (CMBT) detector, is simple for implementation in existing radar systems and has the advantage of minor calculation. First, the target energy of adjacent stretched echoes is coherently accumulated via conjugate multi-plication and Fourier transform operations. It is noted that con-jugate multiplication of two complex Gaussian distributed noise is complex double Gaussian distributed, leading to a signal to noise ratio (SNR) loss. Subsequently, considering the sparsity and clustering characteristics of the conjugate multiplication amplitude spectrum (CMAS), the block thresholding method is adopted for denoising, where the noise and cross-terms are adap-tively smoothed, and the signal terms can be basically pre-served. Finally, numerical simulation results for both synthetic and real radar data validate the effectiveness of the proposed detector, comparing with the conventional integration detector (ID), the spatial scattering density (SSD) detector, and waveform entropy (WE) and waveform contrast (WC) based detectors.