为了探测合成孔径激光雷达的平台振动引起的相位误差，采用一种新的振动测量方法，利用激光外差平衡探测和正交信号处理技术，直接提取探测信号相位，并对正交信号之间的不平衡度引起的误差进行了校正，得到系统探测相位灵敏度为1.45 rad。实验表明，该方法不但能够精确测量低频率微小振动位移引起的相位变化，而且对回波信号的幅度波动不敏感，有别于激光多普勒振动计。

In order to detect the phase error caused by platform vibration of synthetic aperture lidar, a new method of vibration measurement was proposed, which extracted the detection signal phase directly with heterodyne balanced detection and quadrature signal processing technology. Then the errors caused by the unbalance between the two quadrature signals were corrected and the obtained phase sensitivity was 1.45 rad. The experiment showed that this method not only can accurately measure phase variation caused by small vibration with low frequency, but also was insensitive to the amplitude of echo signals′ fluctuation, which was different from the laser Doppler vibrometer.