Closed-loop FOG self-diagnosing and application in RSDIMU

The loop characteristic of closed-loop interferometer fiber optic gyroscope (I-FOG) was analyzed, its self-diagnosing capacity has been revealed. The new type FOG with self-diagnosability was used to the redundant strap down inertial measure unit (RSDIMU) and the fault tolerance algorithm was designed. The state information was induced, so information redundancy at the instrument level as well as output of the gyro is realized and the fault tolerance capacity is improved. The reliability of the system was estimated by using Markov reliability evaluation model, and the result has shown that the reliability is improved.