Abstract
The instability of scale factor and null shift are closely related to the change of the light intensity of a total reflection prism laser gyro (TRPLG). To improve the light intensity stability, the light intensity stabilization principle of TRPLG was analyzed, and a mathematical model of light intensity stabilization system was established. Aiming at the problem that original system has a long adjustment time, a series correction method of adding a proportional integral differential (PID) link in the forward channel was adopted. According to the third-order optimal design, the original I-type third-order overdamped system was optimized to the new II-type third-order underdamped system, which ultimately improved the system's dynamic and steady-state performance. Feedforward compensation was used to introduce the light intensity disturbance during the longitudinal mode hopping into the closed-loop system, which realized the full compensation of the light intensity error and improved the light intensity characteristics during the longitudinal mode hopping. Combined with the above two methods, experimental results showed that the new system with feedforward compensation improved the light intensity stability by 32% at constant temperature and by 40% at variable temperature, with the TRPLG's bias stability improved by more than 16% at constant temperature and by 22% at variable temperature.
Highlights
Laser strapdown inertial navigation system has become the mainstream of medium and high precision inertial navigation systems, and its core component is laser gyro [1]–[4]
The experimental results showed that the new system could improve the light intensity stability by 30% compared to the original system, with the total reflection prism laser gyro (TRPLG)’s bias stability improved by more than 15% (Table 3)
The light intensity of TRPLG is closely related to the gain-to-loss ratio of the dual-isotope light intensity tuning curve
Summary
Laser strapdown inertial navigation system has become the mainstream of medium and high precision inertial navigation systems, and its core component is laser gyro [1]–[4]. The above research objects are all mirror-type laser gyros, which all use high-voltage direct current (DC) excitation to control the light intensity by stabilizing current. Jia et al [31] studied the light intensity control system of TRPLG from the perspective of control theory, simulated the dynamic and steady-state performance of the system under different gains, and provided a reference for gyro debugging. The control principle of TRPLG light intensity was theoretically analyzed from two aspects: low-voltage high-frequency excitation and gain-loss ratio control. The series correction based on PID link effectively improved the dynamic and steady-state performance of the system under the control input, and the feedforward compensation section completely eliminated the system error of the light intensity disturbance caused by the longitudinal mode hopping. The number of inverted particles in the He-Ne gas is controlled by controlling the intensity control signal in real time, thereby realizing the control of the gainto-loss ratio and light intensity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
