An on-orbit high-precision angular vibration measuring device based on laser gyro

The micro-angle vibration of the structure caused by the satellite micro-vibration has a greater impact on the imaging of the optical imaging satellite payload camera, and it is difficult to measure in orbit. In this paper, an angular vibration measuring device based on four-frequency differential laser gyroscopes was presented to meet the needs of satellite in-orbit micro-angular vibration measurement. The gyroscope uses optical methods to overcome the lock-in effect, and there is no mechanical jitter, so the measuring device will not produce mechanical vibration interference to other satellite equipment. In order to improve the measurement accuracy, the pulse subdivision algorithm was used to reduce the quantization error of the laser gyroscopes. The high-precision satellite-time synchronization design was adopted to make the time scale of the measuring device and the load camera consistent to facilitate data use. In addition, a installation matrix calibration method was used to convert the measurement axis of the laser gyroscope and the optical axis of the load camera to the same coordinate system. Finally, the static resolution and dynamic calibration tests of the device were carried out using an angular vibration excitation platform. The results showed that the static resolution reached 0.004"(3s), and the dynamic test performance was better than 5.69%. This device can provide accurate data reference for the satellite to improve the pointing accuracy and stability of the payload.