复相关法测频的硬件实现-声学技术.PDFVIP

第 28 卷第 2 期 声 学 技 术 Vol.28, No.2 2009 年 4 月 Technical Acoustics Apr., 2009 复相关法测频的硬件实现 徐世军，许伟杰 ( 中国科学院声学研究所东海研究站，上海 200032) 摘要：复相关算法适用于多普勒频移的测量，通过选用 FPGA 作为硬件实现平台，可以满足实际的多普勒测频工作。 根据复相关算法测频原理和硬件平台的实际特点，分别对反正切、低通滤波器和正交变换进行了优化, 降低了硬件的 消耗。高效的反正切函数算法通过预先存入值省去了每次反正切函数的运算，优化的 FIR 滤波器和正交变换器进一 步节约了查找表(LUT)资源。通过仿真实验，结合数据的质量保证和控制算法，结果验证了硬件平台的可行性。 关键词：多普勒频移；复相关；反正切；正交变换 中图分类号:TB556 文献标识码:A 文章编号：1000-3630(2009)-02-0180-04 DOI 编码：10.3969/j.issn1000-3630.2009.02.019 A hardware efficient implementation of frequency estimation based on complex correlation method XU Shi-jun, XU Wei-jie (Shanghai Acoustic Laboratory, Institute of Acoustics, Chinese Academy of Sciences, Shanghai 200032, China) Abstract: Complex correlation method is applicable to the Doppler frequency shift measurements through selecting FPGA as a hardware platform to meet the actual work of the Doppler frequency shift measurement. According to this Complex correlation method and the characteristics of hardware platforms, the arctangent, low pass filter and ortho- gonal converter have been optimized, so that the consumption of hardware resources is reduced. By use of the stored values in advance, the highly effective arctangent algorithm can omit the arctangent operation each time. Optimized low pass filter and orthogonal converter further save the search table (LUT) resources. The simulation experiment associated with the data quality assurance and the control algorithm verifies the feasibility of the hard