| 引用本文: | 杨 超， 赖 涛， 黄天佑， 林惠孚， 王青松， 黄海风. 基于FPGA的宽带信号数字下变频多路并行实现方法[J]. 雷达科学与技术, 2025, 23(6): 650-661.[点击复制] |
| YANG Chao, LAI Tao, HUANG Tianyou, LIN Huifu, WANG Qingsong, HUANG Haifeng. A Multi-Channel Parallel Method of Wideband Signal Digital Down Conversion Based on FPGA[J]. Radar Science and Technology, 2025, 23(6): 650-661.[点击复制] |
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| 摘要: |
| 在高中频采样或是射频直采的雷达接收系统中，随着分辨率等要求不断提高，信号带宽以及采样率不断增大，现场可编程门阵列（Field Programmable Gate Array, FPGA）等数字信号处理器件难以直接处理速率高达数吉赫兹的宽带信号。针对采样率与FPGA工作频率的差异，本文基于多相滤波原理，提出了一种可灵活配置并行处理架构的数字下变频方法，针对多种信号情况进行了计算机仿真，并对FPGA实现的滤波器设计、数据处理位宽、资源消耗以及基带信号质量进行了分析与验证。结果表明，本文方法能够适应高速宽带信号的并行数字下变频，有效降低FPGA工作频率，具备较高的工程实用性以及通用性。 |
| 关键词: 宽带 数字下变频 多相滤波 并行处理 现场可编程门阵列 |
| DOI：DOI:10.3969/j.issn.1672-2337.2025.06.007 |
| 分类号:TN957.5 |
| 基金项目:国家自然科学基金（No.62273365）； 深圳市科技计划项目（No.SGDX20230116092503007） |
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| A Multi-Channel Parallel Method of Wideband Signal Digital Down Conversion Based on FPGA |
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YANG Chao, LAI Tao, HUANG Tianyou, LIN Huifu, WANG Qingsong, HUANG Haifeng
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School of Electronics and Communication Engineering, Sun Yat-Sen University, Shenzhen 518107, China
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| Abstract: |
| In the radar receiving system with high intermediate frequency sampling or RF direct sampling, with the increasing requirements of resolution, signal bandwidth and sampling rate, it is difficult for digital signal processing devices such as FPGA to directly handle wideband signals with a rate of up to GHz. Aiming at the rate difference between sampling rate and FPGA working frequency, a digital down conversion method based on the principle of polyphase filter is proposed in this paper, which can flexibly configure parallel processing structure. The computer simulations are carried out for various signal conditions. Meanwhile, the filter design, data processing bit width, resource consumption and baseband signal quality in FPGA implementation are analyzed and verified. The results show that the proposed method can well adapt to the parallel digital down conversion of high-speed wideband signals and effectively reduce the FPGA working frequency, which has higher engineering practicability and versatility. |
| Key words: wideband digital down conversion polyphase filter parallel processing FPGA |
