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.
Use of ring laser units for measurement of moving object deformations
The analysis of the method for the ship deformation measurement is submitted. This method is based on the installing of the ring laser blocks in various points of the object. Kalman filter estimates the static and dynamic deformations by processing the output signals of these units. To make the mathematical model of the method more precise, influence of the gyro drifts was taken into account. Investigations of the filter sensitivity to accuracy of deformation model are carried out. The results of investigations of the filtering efficiency in various condition of the ship rocking are given.
Theater-wide reference information management
Future military operational concepts emphasize the use of multi-platform operations and the sharing of resources within the theater of operations. This capability allows more users access to data from expensive resources. However, before concepts for sharing such resources reach their full potential, several technical issues must be resolved. Of particular interest in this paper are issues related to the processing and sharing of reference systems information, Reference systems information may include position, velocity, attitude, and pointing information from, to, and regarding the ownship, other friendlies, enemy operations, and targets as well as the quality of those parameters. The Reference Systems Branch of the Air Force Research Laboratory Sensors Directorate has conceived a family of programs to address technical issues associated with the fusion and sharing of reference system information. The cornerstone program of this family, called Theater-wide Reference Information Management(TRIM, (1996)), is addressing some of these issues from the perspective of a combat aircraft in an operational theater that includes other airborne and ground based resources. This paper addresses some of the initial TRIM work and describes reference systems issues related to multi-platform data fusion.