| 步进频信号慢速小目标长时间积累检测技术 |
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| 引用本文： | 原浩娟,史云鹏,高毓泽. 步进频信号慢速小目标长时间积累检测技术[J]. 无线电工程, 2019, 0(2): 133-138 |
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| 作者姓名： | 原浩娟 史云鹏 高毓泽 |
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| 作者单位： | 1.上海航天电子技术研究所 |
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| 摘 要： | 分析了利用步进频信号实现慢速小目标距离-多普勒二维高分辨成像的信号处理方法。针对信号的长时间相参积累容易造成多普勒频谱展宽并最终导致成像结果波形发散的问题,分别提出了时域重采样、频域重采样和多普勒通道对齐3种补偿方法,并对其补偿性能进行了深入分析和比较。针对目标运动在步进帧内产生的耦合时移,提出了分多普勒通道补偿的方法。理论分析及仿真结果表明,采用上述的速度补偿方法,可以在不需要任何目标速度先验信息的前提下,利用步进频信号实现慢速小目标的长时间相参积累及距离-多普勒成像。
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| 关 键 词： | 步进频 速度补偿 时域重采样 频域重采样 |
Long-time Coherent Integration Detection of Slow and Small Target Using Stepped Frequency Waveforms |
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| YUAN Haojuan,SHI Yunpeng,GAO Yuze. Long-time Coherent Integration Detection of Slow and Small Target Using Stepped Frequency Waveforms[J]. Radio Engineering of China, 2019, 0(2): 133-138 |
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| Authors: | YUAN Haojuan SHI Yunpeng GAO Yuze |
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| Affiliation: | (Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China) |
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| Abstract: | The range-Doppler imaging method using stepped frequency waveforms is analyzed.A time-domain resampling method,a frequency-domain resampling method and a Doppler bin alignment method are proposed respectively to compensate the Doppler distortion caused by the large time-bandwidth product of the signal.The performances of these methods are analyzed and compared in detail.A velocity compensation method based on respective Doppler bins is applied to compensate for the range-Doppler coupling in stepped frequency signals.Using the compensation methods proposed above,range-Doppler images of moving targets can be formed using stepped frequency waveforms without any prior knowledge of the target motion. |
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| Keywords: | stepped frequency motion compensation time-domain resampling frequency-domain resampling |
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