Miniaturization of RLG with navigation grade performance

Abstract

To miniature RLG, the path length limit for navigation grade performance is estimated, and dither frequency and amplitude is increased to improve random walk coefficient; dither motor is optimized to obtain minimum size and good vibration performance; a structural, piezoelectric coupled finite element model for path length control (PLC) transducer is established, to increase the compensation ability while reducing the diameter of transducer and cavity thickness. A small control electric card on one PCB (Printed Circuit Board) board is developed and packaged with ring laser in the same case, on which all functions are integrated. With heat design, the influence to ring laser is minimized. A navigational grade digital laser gyroscope (DLG) solution is developed, with bias stability better than 0.01 ° /h, size of Φ85×45 mm, weight of 410 g, power consumption of 1.6 W (+15V/+5V power supply) and RS422 interface and top bolted package. And miniature INS with position accuracy of 0.8 Nm/h and weight around 6 kg is also developed with them.