机载多普勒变化率的相差检测

Method of Doppler Rate Detected by Measuring Phase-Difference on Airborne Platform

首先，在现有相差检测机载平台相对角速度的基础上，基于近似相差测向给出了计算机载多普勒变化率的方法。然后，进一步给出了基于精确相差测向的多普勒变化率计算式。和基于数字接收机信号处理的获取方法不同，基于短基线相差测量的多普勒变化率检测方法的最大特点是多普勒变化率可以被实时获取，且理论分析表明，只要基线足够长，就能将检测多普勒变化率的测量误差控制在几赫兹之内。

Firstly, on the available basis of the relative angular velocity obtained by measuring phase difference on airborne platform, this paper presents a method to obtain Doppler rate based on approximative phase difference DF formula. Then, the formula of Doppler rate is presented based on accurate phase difference DF formula. In contrast to the method based on digital signal processing, the maximally characteristic of Doppler rate detected by measuring phase difference based on short baseline array is that Doppler rate can be in time obtained. Theory analysis shows that the measuring error detecting Doppler rate can be controlled within a few hertz as long as the baseline is enough in longness.