Researh Of Sins Virtual Technology In High Dynamic Environment

Compared with platform inertial navigation systems, the strapdown inertial navigation system has many advantages, such as small volume, light weight, low cost, and these characteristics are the development trend of inertial navigation systems. Testing and validation of strapdown inertial navigation system performance is a complex project. The physical test need a long time and high cost, and the application of virtual test technology in the strapdown inertial navigation system test has been very urgent. In view of this situation, the Virtual Test Technology of SINS was studied.The principle and method of strapdown inertial navigation were studied. The performance testing of strapdown inertial navigation system needs flight track data and inertial measurement data, while to obtain the actual flying has some problems, such as long periods and high costs. The simulation algorithm of strapdown inertial navigation was studied. The flight simulation algorithm and inertial sensor simulation algorithm provide the foundation to testing the performance of strapdown inertial navigation system.Flight simulation algorithm ignores the flight mechanics before and it can not meet the requirements of strapdown inertial navigation system's virtual test. In allusion to the flight mechanics, a new trajectory simulation algorithm which was based on three degrees of freedom vehicle model was proposed. Digital simulation tests verified the validity and correctness of the algorithm. In order to identify the actual error model of inertial navigation system from flight test data, a new identification method was proposed. The test results show that the method is effective and has some reference values and some directing significance for engineering application.Based on SINS Virtual Test modeling algorithm, software of virtual experimental system has been designed. Virtual test system was divided into two parts, one is error recognition, to provide support to virtual test for the actual system; the other is virtual test of the actual system, based on inertial error model, use flight simulation algorithms and inertial device simulation algorithms to do virtual testing of the actual system, instead of physical testing. The results show that the virtual testing and physical testing had high degree of coincidence and the virtual testing can replace real test in a certain extent.