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  • 曹贺磊,董勇伟,李毅之. 基于FPGA的多波束相参积累的快速实现[J]. 雷达科学与技术, 2019, 17(4): 449-454.    [点击复制]
  • CAO Helei,DONG Yongwei,LI Yizhi. Fast Realization of Multi-Beam Coherent Integration Based on FPGA[J]. Radar Science and Technology, 2019, 17(4): 449-454.   [点击复制]
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基于FPGA的多波束相参积累的快速实现
曹贺磊,董勇伟,李毅之
0
(1.中国科学院电子学研究所,北京100190;2.微波成像技术国家重点实验室,北京100190;3.中国科学院大学,北京100049)
摘要:
在雷达信号处理中,Keystone变换常常用于校正回波信号长时间相参积累过程中出现的距离走动,以提高信噪比。常规的插值做法运算负担重,资源占用多,当需要对多波束并行处理时,难以进行工程实现。使用非均匀快速傅里叶变换(Non-Uniform Fast Fourier Transform,NUFFT)来实现对多波束信号的相参积累,可以明显减少运算量,提高检测效果。同时,提出一种新的现场可编程门阵列(Field Programmable Gate Array,FPGA)实现方式,通过改写旋转因子,利用两级快速傅里叶变换(Fast Fourier Transform,FFT)来实现NUFFT,提高运算速度的同时又减少了存储量。此方法已经在FPGA中实现,并应用于雷达中。
关键词:  Keystone变换  相参积累  非均匀快速傅里叶变换  多波束并行处理  现场可编程门阵列
DOI:DOI:10.3969/j.issn.1672-2337.2019.04.016
基金项目:国家重点研发计划资助项目(No.2017YFC0822400)
Fast Realization of Multi-Beam Coherent Integration Based on FPGA
CAO Helei,DONG Yongwei,LI Yizhi
(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.University of Chinese Academy of Sciences,Beijing 100049,China)
Abstract:
The Keystone transform is often used to correct the range-cell-crossing in the long-time coherent integration process in order to improve the signal-to-noise ratio in radar signal processing. Conventional interpolation methods are heavy in computation and will occupy a lot of resources,which brings difficulties in engineering realization when multi-beam parallel processing is needed. In this paper,the non-uniform fast Fourier transform (NUFFT) is used to achieve coherent integration of multi-beam signals,which can significantly reduce the computation and improve the detection effect. At the same time,this paper proposes a new field programmable gate array (FPGA) implementation method. The NUFFT is realized by rewriting the rotation factor and using the two-level fast Fourier transform (FFT). The computing speed is improved and the storage capacity is reduced. This method has been implemented in FPGA and applied to radar.
Key words:  Keystone transform  coherent integration  non-uniform fast Fourier transform(NUFFT)  multi-beam parallel processing  field programmable gate array(FPGA)