摘要:
提出了一种利用机载短基线阵列，以及通过多通道相移测量获得时差变化率的新方法。由相差与时差定位方程即可解出基于相差检测的时差表示式，通过微分，并利用相移与频移间的函数关系即可得到仅基于相差检测的时差变化率。另一方面，如对测向公式进行微分运算，则又可得到仅基于频差检测的时差变化率。模拟计算验证了所导出的时差变化率测算公式都是正确性的。初步的误差分析说明，由于分母上具有量级很大的光速，故基于相差或频差的时差变化率的检测应具有较高的测量精度。新方法将能用于解决在机载平台上时差变化率难以实时检测的问题。
A new method for detection of time difference rate using short baseline array on airborne platform is presented by measuring the phase shift in multichannel way. The time difference expression based on phase difference measurement can be solved according to phase difference and time difference location equation. Further, the time difference rate based on phase difference measurement can be derived by differential and making use of the functional relationship between phase shift and Doppler shift. On the other hand, the time difference rate based on frequency difference measurement can be obtained if we do the differential analyzer for direction finding formula. The analog calculation validates that derived formula of time difference rate are all correct. The elementary error analysis shows that the measurement accuracy of time difference rate based on phase difference or frequency difference is higher for having the light velocity whose order of magnitude is enormous in denominator of formula. The major contribution in this paper is that the time difference rate on airborne platform can be in real time detected by phase interferometry with short-baseline array.