一种适用于低信噪比条件的高精度频率估计方法

A High-accuracy Frequency Estimation Method Applied to Low SNR Condition

针对基于快速傅里叶变换(FFT)算法的动目标检测频率估计误差问题,分析了2种传统的频率估计算法,并指出其优缺点,提出了一种综合频率估计方法。该方法在全通道都保持较高的频率估计精度,而且具有强的噪声容忍性,适用于低信噪比条件下的多普勒频率估计。通过计算机仿真验证了该方法的有效性。

Aiming at the frequency estimation error problem of moving target detection based on fast Fourier transform （FFT） algorithm,this paper analyzes two kinds of traditional frequency estimation algorithms,points out the advantages and disadvantages, proposes a synthetic frequency estimation method. This method has good frequency estimation accuracy and noise tolerance, is applied to Doppler frequency estimation in low signal to noise ratio （SNR） condition. This paper validates the validity of the method through the computer simulation.