| 利用FFT/WFFT-DWT提高雷达处理增益的性能分析 |
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| 引用本文： | 简涛,苏峰,何友,曲长文,平殿发.利用FFT/WFFT-DWT提高雷达处理增益的性能分析[J].系统仿真学报,2007,19(8):1879-1882. |
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| 作者姓名： | 简涛 苏峰 何友 曲长文 平殿发 |
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| 作者单位： | 海军航空工程学院信息融合技术研究所,山东烟台,264001 |
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| 基金项目： | 教育部全国优秀博士学位论文作者专项基金 |
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| 摘 要： | 当目标的多普勒频率与FFT滤波器组不精确匹配时,会产生FFT的高副瓣现象。利用加窗FFT可以抑制副瓣,但降低了主瓣信噪比。在WFFT输出端利用离散小波变换(discrete wavelet transform,DWT)可以改善雷达处理增益(processing gain,PG),推导了单边形式WFFT-DWT的处理增益公式,并利用FFT/WFFT-DWT进一步提高雷达处理增益。检测性能分析表明,FFT/WFFT-DWT在存在频率偏移时有比FFT/FFT-DWT和FFT更好的检测性能。
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| 关 键 词： | 雷达信号检测 离散小波变换 处理增益 |
| 文章编号： | 1004-731X（2007）08-1879-04 |
| 收稿时间： | 2006-03-17 |
| 修稿时间： | 2006-08-29 |
Performance Analysis for Radar Detectability Improvement Using FFT/WFFT-DWT |
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| JIAN Tao,SU Feng,HE You,QU Chang-wen,PING Dian-fa.Performance Analysis for Radar Detectability Improvement Using FFT/WFFT-DWT[J].Journal of System Simulation,2007,19(8):1879-1882. |
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| Authors: | JIAN Tao SU Feng HE You QU Chang-wen PING Dian-fa |
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| Institution: | Research Institute of Information Fusion, Naval Aeronautical Engineering Institute, Yantai 264001, China |
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| Abstract: | When Doppler frequency of target does not match the FFT bin frequencies exactly, the high side lobe appears. The weighed FFT (WFFT) can suppress the side lobe but decrease the SNR in main lobe. Discrete wavelet transform (DWT) was applied to output of WFFT to recover processing gain (PG) lost from non-optimum input signals. And then FFT/WFFT-DWT was proposed to improve PG further. Results of PG and detectability analysis demonstrate that FFT/WFFT-DWT can attain much higher detectability than FFT/FFT-DWT as well as FFT especially in unmatched state. |
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| Keywords: | WFFT MTD |
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