Design and implementation of a high-speed configurable 2D CFAR detector

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), May.2023, Vol.46 No.5: 627-631, 677

DOI: 10.3969/j.issn.1003-5060.2023.05.009

Authors

TAO Xiangying $ ^{1,2} $, ZHANG Duoli $ ^{1,2} $, LIU Wenjuan $ ^{1,2} $, NI Wei $ ^{1,2} $, SONG Yukun $ ^{1,2} $

(1. School of Microelectronics, Hefei University of Technology, Hefei 230601, China; 2. IC Design Web-cooperation Research Center of Ministry of Education, Hefei 230601, China)

Abstract and Keywords

Abstract: Constant false alarm rate(CFAR) detection is an important adaptive algorithm for radar target detection under interference. With the increase of the reference window size, the two-dimensional (2D) CFAR algorithm has heavier computation. The software implementation alone cannot meet the needs of high real-time performance. Based on field programmable gate array(FPGA), this paper designs and implements a hardware accelerator compatible with four 2D CFAR algorithms: CA-CFAR, GO-CFAR, SO-CFAR and OS-CFAR. At the same time, it realizes the configurable flexibility of nominal factor, detector type, ranking value K, and reference window and protection window sizes. For $ 256 \times 2048 $ point Range Doppler Matrix(RDM) data, four detectors can complete the detection within 2.71 ms. The design adopts full pipeline structure and has high real-time performance.

Keywords: radar target detection; two-dimensional constant false alarm rate(2D CFAR); sliding window; hardware acceleration; rectangular window

作者信息

陶相颖 $ ^{1,2} $，张多利 $ ^{1,2} $，刘文娟 $ ^{1,2} $，倪伟 $ ^{1,2} $，宋宇鲲 $ ^{1,2} $

(1. 合肥工业大学微电子学院，安徽合肥 230601；2. 教育部IC设计网上合作研究中心，安徽合肥 230601)

摘要和关键词

摘要: 恒虚警率(constant false alarm rate, CFAR)检测是雷达在干扰背景下检测目标的重要自适应算法。二维 CFAR 算法随着参考窗口尺寸增大，运算量较大，仅靠软件实现并不能满足较高的实时性需求。文章基于现场可编程门阵列(field programmable gate array, FPGA)设计实现了一种兼容 CA-CFAR、GO-CFAR、SO-CFAR 和 OS-CFAR 4 种二维 CFAR 算法的硬件加速器，同时实现标称化因子、检测器类型、排序值 K、参考窗口和保护窗口大小可配置的灵活性，对于 $ 256 \times 2048 $ 点距离-多谱勒矩阵(Range Doppler Matrix, RDM)数据，4 种检测器均可在 2.71 ms 内完成检测。设计采用全流水结构，具有高实时性。

关键词: 雷达目标检测；二维恒虚警率(CFAR)；滑动窗口；硬件加速；矩形窗

Funding

国家自然科学基金资助项目（61874156）；安徽省高校协同创新资助项目（GXXT-2019-030）

合肥工业大学学报(自然科学版)

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