﻿ 机载平台相差变化率的多通道相移检测

# 机载平台相差变化率的多通道相移检测Method Obtaining Phase-Difference Rate by Multichannel Phase Difference Detection on Airborne Platform

Abstract:
Based on the function relationship between phase shift and Doppler shift, this paper presents a new method obtained the phase-difference rate on airborne platform by measuring the phase shift in multichannel way. Firstly, the method that detects Doppler shift by measuring phase difference is described by making use of the mutually complementary relationship between the arrival angles obtained by direction finding based on phase interferometer and advance angle contained in Doppler shift equation. Further, the method detecting phase difference rate based on phase difference measurement is derived by differential for distance-phase difference equation. Meanwhile, it also proves theoretically that the phase difference rate can be obtained by frequency measurement. On this basis, according to the ranging method based on phase difference rate, this paper indirectly verified the correctness of the phase difference rate formula obtained based on the multi-channel phase difference measurement. Although the error analysis shows that the measurement accuracy obtained based on the multi-channel phase difference measurement is poor, multichannel phase detection can avoid the problem making measurement error worse since the space value of measured frequency difference is little and equivalent measuring time is shorter as compared with the measurement method of phase difference rate obtained by the frequency measurement based on two-channel phase demodulation. At the same time, because the phase difference rate can be obtained by single measurement in real time and the system dispenses with accumulating the adequate length of phase difference sequence by prolonging viewing time, there is no need to restrict the aircraft moving speed.

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