Abstract
Rotation modulation (RM) has been widely used in navigation systems to significantly improve the navigation accuracy of inertial navigation systems (INSs). However, the traditional single-axis rotation modulation cannot achieve the modulation of all the constant errors in the three directions; thus, it is not suitable for application in highly dynamic environments due to requirements for high precision in missiles. Aiming at the problems of error accumulation and divergence in the direction of rotation axis existing in the traditional single-axis rotation modulation, a novel rotation scheme is proposed. Firstly, the error propagation principle of the new rotation modulation scheme is analyzed. Secondly, the condition of realizing the error modulation with constant error is discussed. Finally, the original rotation modulation navigation algorithm is optimized for the new rotation modulation scheme. The experiment and simulation results show that the new rotation scheme can effectively modulate the error divergence of roll angle and improve the accuracy of roll angle by two orders of magnitude.
Highlights
Principle of Single-Axis Rotation Modulation Navigation AlgorithmThe structure of inertial navigation systems using error modulation technology has changed
The original rotation modulation navigation algorithm is optimized for the new rotation modulation scheme
Since ammunition in highly dynamic environments is of small volume, low cost, high precision demand [34], this paper proposes a new compound rotating modulation scheme based on MEMS inertial sensor
Summary
The structure of inertial navigation systems using error modulation technology has changed. IMU composed ofmicro three micro gyroscopes and three micro accelerometers is installed on the rotating platform to measure the motion information in real time, and the required navigation information is processed by the navigation computer after being compensated by existing error compensation model. IMU should be consistent with the axes of the carrier coordinate system and affixed to the vehicle, and at the same time, the MEMS gyroscopes and gyroscopes and three micro accelerometers is installed on the rotating platform to measure the motion information in real time, and the required navigation information is processed by the navigation computer after being compensated by existing error compensation model. In the high-rotation and highly dynamic environment, it is necessary to design a new scheme to achieve the purpose of improving the reliability and accuracy of the system in the finite volume
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