| 摘要: |
| 针对雷达多径干扰问题，提出一种基于正交频分复用（OFDM）的多发多收合成孔径雷达（MIMO-SAR）抗多径波形设计方法。该方法基于频率分集原理，设计循环移位OFDM-LFM波形提升OFDM波形有效带宽，并针对该波形设计MIMO平台收发模型，结合多通道正交波形空时编码（STC）方案实现多通道接收信号分离，该波形设计方案对SAR多径干扰抑制有效。该方法可以解决多径干扰导致的目标分辨率低及虚假目标问题，在机载SAR高分辨率成像、车载SAR城市探测与智能驾驶等方面具备广阔应用前景。 |
| 关键词: 抗多径 正交频分复用 频率分集 空时编码 |
| DOI：DOI: 10.3969/j.issn.1672-2337.2019.01.013 |
| 分类号:TN958.5 |
| 基金项目: |
|
| Design of MIMO-SAR Anti-Multipath Waveform Based on OFDM |
|
LI Yi, WANG Jie, LIANG Xingdong
|
|
1.Institute of Electronics, Chinese Academy of Sciences, Beijing 100190,China;2.National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China;3.3.University of Chinese Academy of Sciences, Beijing 100049, China;4.4.Nanjing University of Information Science and Technology, Nanjing 210044, China
|
| Abstract: |
| Aiming at the radar multipath interference problem, a kind of waveform design method based on orthogonal frequency division multiplexing (OFDM) is put forward for anti-multipath of MIMO synthetic aperture radar (MIMO-SAR). The method is based on frequency diversity principle. Cycle shift orthogonal frequency division multiplexing-linear frequency modulation (OFDM-LFM) waveform is designed to enhance effective bandwidth of the OFDM waveform. And MIMO transceiver platform model is designed to match it. The multichannel orthogonal waveform space-time coding (STC) scheme can realize separation of multichannel signal in combination with the model. The waveform design scheme is effective in suppressing multipath interference on SAR. This method can solve the problem of low target resolution and false target caused by multipath interference, and has broad application prospects in airborne SAR high resolution imaging, vehicular SAR detection in city and intelligent driving. |
| Key words: anti-multipath orthogonal frequency division multiplexing(OFDM) frequency diversity space-time coding(STC) |
