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MIMU in Flight Calibration and Alignment Algorithms

Author: ZouYing
Tutor: FengZhiGang
School: National University of Defense Science and Technology
Course: Aeronautical and Astronautical Science and Technology
Keywords: MEMS inertial devices Inertial Navigation calibration Transfer Alignment
CLC: TJ414.9
Type: Master's thesis
Year: 2009
Downloads: 141
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Abstract


Alternative to traditional inertial MEMS inertial devices (MIMU) devices is an important trend of the future development of the navigation system guided bombs . The most important factor of this stage constraints MEMS inertial devices put into use in large - scale guided bombs MEMS gyro drift error . An effective way to solve this problem is to release a pre- guided bombs , the use of carrier aircraft the main inertial navigation information on the guided bombs MEMS gyro drift estimate , completed before the release of the corresponding error compensation to achieve the accuracy of the guided bombs requirements. First , the thesis MIMU guided bombs used as research background , analysis of the major problems the MIMU use guided bombs , introduced the research progress MIMU air calibration alignment technique (MICA) . Then , through a combination of navigation MIMU / GPS -guided bomb during the flight considerable research and the appropriate combination of navigation simulation work , analysis , and get the MIMU air calibration alignment to solve the key problem . The aerial calibration in MIMU alignment , the use of the defects and deficiencies traditional transfer alignment principle and simulation analysis . Next, study the establishment of calibration alignment algorithm based on two types of matching way MIMU air , and the performance of the algorithm is verified by simulation . For warming failed to result in larger drift MEMS gyro , is derived and established quaternion nonlinear air under the conditions of large misalignment angle calibration alignment model , and the simulation work . Finally , on the assumption that the sub INS initial error on the basis of the study to establish the air based on feedback linearization error model calibration alignment program to avoid the non-linear model brought a large amount of computation . Simulation results show that feedback linearization error model of large drift of the gyro is estimated to have a better performance . Finally, the practical application of the alignment algorithm for air calibration , different motor conditions and the performance of the algorithm in the case of different filter update . Deduced on this basis , the establishment of the GPS signal in the presence of a drop - dimensional fast air calibration alignment programs . Simulation results show little effect on the accuracy of the premise , can effectively reduce the calibration time aligned .

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