欺骗干扰信号中多普勒频率变化率测量技术研究

Research of Measure Techniques for Doppler Frequency Rate-of-Change in Deceive Jamming Signals

对欺骗干扰源进行单站无源定位与跟踪的一个关键技术就是能否实现多普勒频率变化率的高精度测量。受限于干扰源的运动速度,多普勒频率变化率信息一般都非常微弱。本文提出了一种基于Morlet小波变换的高精度多普勒频率变化率估计方法,通过对欺骗干扰信号的小波变换系数自相关,增强了多普勒频率变化率信息,消除了相位模糊。计算机仿真研究表明在一般无源观测条件下多普勒频率变化率的估计均方误差能逼近CRLB。

In the passive locating and tracking of single observer for deceive jamming source, a key technology is an accurate measurement of Doppler Frequency Rate-of-Change. Limited to velocity of jamming source, the Doppler Frequency Rate-of-Change is very subtle. In this paper, an accurate measuring method is proposed to estimate the Doppler Frequency Rate-of-Change based on Morlet wavelet transform. According as auto correlating the wavelet transform coe^cient of deceive jamming signal ,the Doppler Frequency Rate- of-Change is enhanced and phase ambiguity is unwrapped. The computer simulation study shows that mean square error of the Doppler Frequency Rate-of-Change approach CRLB in a common passive observing condition.