Reliability Analysis of An Inertial Navigation System and its Active Fault Detection and Isolation Unit

Inertial navigation systems are one of the main components in advanced equipment navigation systems such as drones and satellites. Therefore, their reliability is very important for system mission success. For increasing the reliability while developing advanced sensors, the issue of sensor placement and arrangement, the use of redundancy, and error detection should also be considered. This paper evaluates different sensor configurations and reliability analyses of fault detection and isolation of an inertial navigation system. First, the design of the navigation system is analyzed in terms of the location of the sensors, then the detection and fault detection unit based on the excess sensors. The system's reliability is calculated based on exponential distribution and reliability block diagram, and then the reliability fault detection unit is calculated using the Monte Carlo method. The sensitivity analysis has been performed, and the results show that the reliability depends on the noise value. Because the reliability of this system is a function of the fault detection and its threshold values, the optimal values for fault detection threshold are obtained using two iterative methods and estimating the minimum nonlinear squares.