Optimization method for the layout of IMUs in deformation detection system of warship based on genetic algorithm
The deformation of warship will influence the accuracy of angular position about the equipment in the deck. IMUs(Inertial Measurement Unit, laser gyros and accelerometers) are installed on various points of the warship to estimate the deformations. Genetic algorithm is utilized for the optimization of the layout of the IMUs, the fitness function of the genetic algorithm is built by the ship's Modal Assurance Criterion (MAC) matrix. Results show that the Genetic algorithm based method presented in this paper can give an optimal layout of the IMUs for detecting the deformation of the warship.
Vital Advanced Inertial Network
Many aircraft sensors and weapons require accurate, local, time-varying inertial information relative to a principal reference, usually the main inertial navigation system. This data may be required during severe manoeuvres and despite other structural deflections due to aircraft aging, changing stores configurations, and fuel burnoff. Past solutions to this problem have included co-location, structural stiffening, or transfer alignment using high cost navigation grade inertial sensors. The Vital Advanced Inertial Network (VAIN) program sponsored by the Reference Systems Branch of the Wright Laboratory Avionics Directorate, is developing and testing an advanced inertial network to support precision targeting and weapon delivery under the influence of structural bending. This paper addresses some of the VAIN work and describes the sensor requirements for and performance of a transfer alignment based algorithm for compensating for aircraft flexure using low cost inertial sensors.
Kalman Filter Formulations for Transfer Alignment of Strapdown Inertial Units
Formulations of Kalman filters are presented which are capable of aligning one strapdown inertial sensor assembly with another by estimating the misalignment angle between them. One formulation treats the case of a fixed misalignment. Another treats the case of a dynamic misalignment, caused, say, by bending of the common supporting body. Measurements can be made by gyros only, or by gyros plus accelerometers. Filters which estimate inertial sensor error parameters are also discussed.