A New Four-Axis Angular Displacement Measurement System Based on Laser Gyro

With the development of remote sensing satellites, the influence of satellite platform micro-vibration on the imaging quality and application of high-resolution satellites is becoming more and more obvious. In this paper, a new four-axis angular displacement measurement system on orbit is proposed, which can be used to measure the micro-vibration of satellite platform. By using high-frequency and high-precision four-mode differential laser gyro, the problem of satellite platform high-frequency micro-vibration measurement is solved. Through a new system architecture, a four-axis measurement system is realized, and any axis can be backed up. By optimizing the application strategy, the high-performance measurement is ensured and the reliability of the system is improved. By designing the magnetic shield structure, the ability of the system to resist the interference of alternating magnetic field is improved, and the lightweight design is realized at the same time. For four-axis measurement systems, the calibration method of mounting matrix is realized. Through performance test, the system measurement accuracy is better than 0.003ʺ (3σ), and the anti-interference ability of alternating magnetic field is improved, which is more conducive to long-term use on orbit in complex environment and has obvious effect on image compensation and geometric correction.