一种基于RFT和分段处理的高速机动目标相参积累算法 |
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引用本文: | 陈海旭,李小龙,易伟,方学立,张雷.一种基于RFT和分段处理的高速机动目标相参积累算法[J].信号处理,2021,37(7):1189-1197. |
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作者姓名: | 陈海旭 李小龙 易伟 方学立 张雷 |
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作者单位: | 电子科技大学信息与通信工程学院 |
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基金项目: | 国家自然基金青年项目(61801085);中国博士后科学基金(2019T120825, 2018M63352);长江学者基金;国防科技创新特区支持项目(重点项目) |
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摘 要: | 高速机动目标会在短时间内跨越距离单元(Range Migration, RM),并且由于目标机动性产生跨多普勒单元(Doppler Spread, DS)等问题。基于搜索的传统处理算法通过时间和计算量换取积累性能,不利于工程应用。本文提出一种通过分段处理方式对回波进行相参积累的算法。该算法在保证子片段内回波RM和DS问题可以忽略的前提下,将积累时间划分为若干个子片段。在该分段准则下通过Radon-Fourier Transform(RFT)对子片段进行处理。随后,根据各子片段RFT积累峰值位置分布特性和相位差异,设计一种子片段间的相参积累方案,实现多个子片段间峰值能量的相参积累。所提算法在子片段内可以忽略目标机动性的影响,避免了子片段内目标机动参数(加速度项)的搜索,可在积累性能和计算效率之间取得良好平衡。
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关 键 词: | 高速机动目标 相参积累 分段处理 子片段 |
收稿时间: | 2021-03-02 |
Coherent integration algorithm for high-speed maneuvering targets based on RFT and segmented processing |
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Affiliation: | School of Information and Communication Engineering, University of Electronic Science and Technology of China |
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Abstract: | The high-speed maneuvering target would cross the Doppler unit and the Range unit in a short time. The traditional multi-dimensional search-based coherent integration method was not conducive to engineering realization. This paper presented a coherent integration algorithm for high-speed maneuvering targets based on segmented processing. In this algorithm, the Range Migration and Doppler Spread caused by the target acceleration could be ignored in sub-segment, and then the coherent integration of the echo signals in each sub-segment completed by Radon-Fourier Transform (RFT). Then, according to the peak accumulation characteristics and phase characteristics of each sub-segment RFT, a coherent integration algorithm was designed among sub-segments to realize the accumulation of peak energy among multiple sub-segments. The proposed algorithm can ignore the influence of target maneuverability in the sub-segments, avoid the search of target maneuvering parameters (acceleration) in the subsegments, and achieve a good balance between accumulation performance and computational efficiency |
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