机载平台相对角速度的相移检测法

Detection Method of Relative Angular Velocity by Measuring Phase-Shift on Airborne Platform

如对基本测向公式进行微分变形,则即可得到基于频差检测的角速度计算公式。进一步引用相差与频差之间的函数关系,即可将频差检测等效转化为相差检测。模拟计算验证了本文所导出的仅基于相差检测的角速度计算公式的正确性。误差分析则表明,在综合考虑了相差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1 mrad/s的测量精度。

After making the differential transformation for direction finding based on phase interferometry, the formula of angular velocity can be obtained by measuring frequency difference. Further, the measurement for frequency differ- ence can be transformed into phase difference measurement as soon as the function relationship between frequency shift and phase shift is introduced. The analog calculation validates 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 achieve the measurement accuracy less than 1 mrad/s after synchronously calculating the measurement error of phase difference and airborne platform flight speed.