| 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 |
| 分类号:TN957.51 |
| 基金项目:国家重点研发计划资助项目(No.2017YFC0822400) |
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| Fast Realization of Multi-Beam Coherent Integration Based on FPGA |
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CAO Helei，DONG Yongwei，LI Yizhi
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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
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| 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) |
