基于FrFT空间目标探测与高精度频率估计

Space target detection and accurate frequency estimation using FrFT

摘要:

针对空间目标探测中低信噪比下信号检测与频率精确估计的问题，提出了基于分数阶傅里叶变换(FrFT)的实现方法。首先介绍FrFT进行参数估计的基本原理，在对接收回波信号的动态特性进行分析的基础上，为满足信号检测概率和实时处理要求，设计FrFT在空间目标检测应用中的相关参数，并提出频率估计精度的改进措施，分析了目标检测和频率估计性能。仿真分析结果表明该方法满足工程要求。

Abstract:

A method based on Fractional Fourier Transform(FrFT) is put forward to solve the problems in low Signal-Noise Ratio(SNR) detection and accurate frequency estimation for space target detection. At first the theory of parameter estimation by FrFT is introduced. Then, after analyzing the dynamic characteristic of the echo, the parameters of FrFT using in space target detection are designed to meet the requirements of real-time processing and high detection probability. The method of improving frequency estimation precision is proposed. The performance of target detection and frequency estimation is analyzed. The results of simulation show that the proposed method is applicable and effective.