Airborne Distributed Micro Inertial Attitude Determination System Alignment Technology Transfer

In modern war, in order to enhance the pilot’s situational awareness of the outside world, the optical detectors for imaging were installed around the aircraft. However, line of sight for optical detector with the carrier aircraft vibration must produce a certain level of random jitter. This vibration will make the image shaking, and will have a great impact on the image mosaic of several detectors. Therefore, it is necessary to install a micro-inertial attitude measurement system in a coaxial direction of each optical detector. However, the measurement accuracy of the micro-inertial attitude measurement system depends largely on the technology of transfer alignment. Taking a photoelectric detection platform for the study, the study of the technology of transfer alignment of the micro-inertial attitude measurement system is systematic and comprehensive.Firstly, the matching algorithms based on velocity were designed. The velocity matching was compared with the integrated velocity matching by simulation. The matching algorithms based on the velocity and attitude were proposed. The "velocity+attitude" matching, the "velocity+attitude matrix" matching, the "velocity+measurement misalignment" matching and the "velocity+optimal attitude" matching were compared by simulation. Meanwhile, the algorithms based on velocity and angular rate were studied. The simulation shows that the "velocity+angular rate" matching has better performance than the "velocity+attitude" matching in some cases. On this basis, the "integrated velocity+integrated angular rate" matching was designed. The simulation shows that it can effectively restrain the effect of flexure deformation on transfer aligment.Secondly, the error components that have an effect on the performance of transfer aligment and compensation methods were studied in the paper. The compensation method of the velocity error of lever arm was designed and was verified by simulaition. Aiming at the problem of data transmission delay, the extrapolation and the state extension were designed. Their feasibility are verified by simulation. According to the characteristic of dynamic flexibility distortion, the compensation method of flexibility distortion were designed and verified.Finally, aiming at the special environment of the photoelectric detection platform, a micro inertial attitude measurement system which is based on a structure of floating point DSP+FPGA has been designed. Several experiments have been made to micro inertial attitude measurement system. The final results of these experiments are more ideal and can statisfy the demands of the practical engineering application.Finally, the transfer alignment test platform of a distributed micro-inertial attitude measurement system was designed. The structure design and software design of transfer alignment test platform have been accomplished. Through a lot of vehicle experiments, the effectiveness and feasibility of the transfer alignment algorithm was verified. The flight experiments for the next test have laid a good foundation.