弹载毫米波合成孔径被动精确探测系统

合成孔径技术在弹载毫米波被动探测系统中的应用可以弥补被动探测不能给出目标距离的缺点,大大提高了系统的性能.本文首先介绍了近程毫米波合成孔径技术,其主要特点是成像公式中存在二次相位补偿因子,相位补偿后会使近程脉冲响应变窄,幅值提高;然后提出近程条件下的合成孔径被动测距原理,近程辐射球面波,其波前曲率和传播距离呈反比,测距原理是通过估计二次相位因子的调频斜率确定电磁波的传输距离;最后采用了双正交傅里叶变换算法进行被动测距,这种变换可以有效地估计多线性调频信号的调频斜率.

An Accurate Detection System for Missile MMW Synthetic Aperture

Synthetic aperture technology applied to missile passive MMW detection system can make up for the shortcoming that a passive detection system cannot give target range, thus can greatly improve the system performance.This paper first discusses the near range MMW synthetic aperture technology, showing that its chief characteristic is the quadratic phase compensation factor in imaging formula that can compress impulse response of the point source and improve the amplitude;and then presents the principle of synthetic aperture passive ranging under near range conditions.In near range, there are spherical wave radiations and the wave front curvature of the spherical wave is inversely proportional to propagation distance, which can be used to estimate the quadratic phase compensation factor rate so as to obtain the wave front curvature, and the range.Bi-orthogonal Fourier Transform algorithm is adopted for passive ranging, which can efficiently estimate FM rates of multi-linear FM signals.