机载平台相对角速度的无模糊相差检测

Detection of Relative Angular Velocity on Airborne Platform by Measuring Phase Difference without Ambiguity

描述了相差变化率的多通道相差以及无模糊检测方法，以及长基线测向解。随后通过对相差测向式微分，即可直接得到基于相差变化率和方位角测量的机载平台相对角速度计算公式。在此基础上，一方面借助一维双基阵所测得的相差值解算无模糊程差差分值，另一方面利用短基线相差测向仪给定方位值，即可实现对机载平台相对角速度的无相位模糊检测。误差分析则表明，在综合考虑了相差、角度和速度的测量误差之后，具有实时测量性能的新方法可实现小于3mrad／s的测号精度．

The detection method of muhichannel phase difference without ambiguity for phase difference rate as well as DF solution based on long baseline is depicted. Then by the differential for direction finding based on phase interferometry, the formula of angular velocity can be ob- tained based on measuring of phase difference rate and azimuth. On this basic, on the one hand, using the phase difference value measured by one-dimensional double-base array solves out the difference of path difference without phase ambiguity. On the other hand, using phase difference DF instrument of short-baseline determines the azimuth of target. It can achieve detection with- out phase ambiguity for relative angular velocity on airborne platform. The analog calculation val- idates that derived formula only based on phase difference measurement is correctness. The error analysis shows that the new method which has the performance of real-time measurement can a- chieve the measurement accuracy less than 3mrad/s after synchronously calculating the measure- ment error of phase difference and azimuth as well as airborne platform flight speed.