基于FPGA的数字接收机多普勒频率估计的实现  

FPGA-based Doppler Frequency Estimation for Doppler Digital Receiver

作　　者：韩志伟[1] 刘高翔[1] 

机构地区：[1]东南大学自动化学院,南京210096

出　　处：《信息化研究》2015年第2期38-41,共4页INFORMATIZATION RESEARCH

基　　金：国家自然科学基金资助项目(11178008)

摘　　要：在深空探测多普勒数字接收机中,多普勒参数尤其是多普勒频率(包括初始频率与线性调频率参数)的估计是其核心指标。文章介绍了一种基于现场可编程门阵列(FPGA)的多普勒数字接收机的多普勒参数估计方法及其实现。多普勒参数估计主要以初始频率与线性调频率为主要研究对象,首先从前端处理后的数字下变频信号进行快速傅氏变换(FFT)运算,实现调频率估计,然后再由此调频率产生线性调频信号,线性调频信号与原信号共轭相乘作为中间信号,最终进行基于Rife算法的初始频率估计,最后进行了仿真验证,给出了实验室测试结果。验证结果表明,该设计运算量较小、估计精度高、实时性较强。Estimation of Doppler parameters,especially the initial frequency and chirp frequency,is the core content in deep space exploration Doppler digital receivers.The paper introduces an estimation method of Doppler frequency parameters and FPGA implementation for digital receiver Doppler based on FPGA.Doppler parameter estimation mainly contains initial frequency and chirp frequency.First,the digital front-end processing down-converted signal does the FFT operation,thus it can achieve rate estimation,and then generate chirp signal according to the frequency.The chirp signal and the original signal conjugate as an intermediate signal,ultimately achieve the initial frequency estimation based on Rife algorithm.It gets the simulation verification and the laboratory test results,and the results show that the small computation,estimated high precision,and real strong of the modules design.

关 键 词：现场可编程门阵列 初始频率 线性调频率 数字接收机 多普勒参数 

分 类 号：TN851[电子电信—信息与通信工程]