Four-position drift measurement of SINS based on single-axis rotation

2012 ◽  
Author(s):  
Feng Sun ◽  
Jianzhong Xia ◽  
Yueyang Ben ◽  
Xin Zhang
Keyword(s):  
Axis Rotation ◽  
Single Axis Rotation

scholarly journals A Low-Cost MEMS Missile-Borne Compound Rotation Modulation Scheme

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4910
Author(s):  
Xiaoqiao Yuan ◽  
Jie Li ◽  
Xi Zhang ◽  
Kaiqiang Feng ◽  
Xiaokai Wei ◽  
...  
Keyword(s):  
Rotation Axis ◽  
Low Cost ◽  
Roll Angle ◽  
Modulation Scheme ◽  
Navigation Systems ◽  
Rotation Scheme ◽  
Compound Rotation ◽  
Error Accumulation ◽  
Axis Rotation ◽  
Single Axis Rotation

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.

Application of Adaptive Kalman Filter Technique in Initial Alignment of Single-Axial Rotation Strap-Down Inertial Navigation System

2012 ◽  
Vol 466-467 ◽  
pp. 617-621
Author(s):  
Song Tian Shang ◽  
Wen Shao Gao
Keyword(s):  
Kalman Filter ◽  
Axial Rotation ◽  
Estimation Accuracy ◽  
Initial Alignment ◽  
Adaptive Kalman Filter ◽  
Rotation System ◽  
Kalman Filter Algorithm ◽  
Axis Rotation ◽  
Single Axis Rotation ◽  
Better Than

In order to improve the accuracy of initial alignment which determines the accuracy of navigation, a Sage-Husa adaptive kalman filter algorithm is applied to SINS initial alignment of single-axis rotation system. The simulation result further shows that in the case of inaccurate statistical property of noise, the estimation accuracy of Sage-Husa adaptive kalman filter is better than the conventional kalman filter.

scholarly journals Shorter Path Design and Control for an Underactuated Satellite

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Jung-Hyung Lee ◽  
Donghoon Kim ◽  
Jichul Kim ◽  
Hwa-Suk Oh
Keyword(s):  
Shortest Path ◽  
Numerical Optimization ◽  
Path Length ◽  
Optimal Solutions ◽  
Path Design ◽  
Proper Number ◽  
Control Failure ◽  
Axis Rotation ◽  
And Control ◽  
Single Axis Rotation

In the event of a control failure on an axis of a spacecraft, a target attitude can be achieved by several sequential rotations around the remaining control axes. For a spacecraft actuating with wheels, the form of each submaneuver should be a pure single axis rotation since the failed axis should not be perturbed. The rotation path length in sequential submaneuvers, however, increases extremely but is short under normal conditions. In this work, it is shown that the path length is reduced dramatically by finding a proper number of sequential submaneuvers, especially for the target attitude rotation around the failed axis. A numerical optimization is suggested to obtain the shortest path length and the relevant number of maneuvers. Optimal solutions using the sequential rotation approach are confirmed by numerical simulations.

Double-tilt FIM specimen holder for JEOL 200CX

1984 ◽  
Vol 42 ◽  
pp. 628-629
Author(s):  
J.W. Newkirk ◽  
S.D. Walck ◽  
R.H. Jones ◽  
J.J. Hren
Keyword(s):  
Atom Probe ◽  
Angular Range ◽  
Tilt Axis ◽  
Diffraction Contrast ◽  
Specimen Holder ◽  
Wire Specimen ◽  
Axis Rotation ◽  
Single Axis Rotation ◽  
Contrast Studies ◽  
Imaging Atom Probe

It has long been recognized that combined TEM and FIM analyses provide a powerful analytical combination. Special holders that will accept needle shaped FIM specimens have been built and used by several investigators. However, full advantage of the TEM could not be taken because previous holders have been capable of single axis rotation only--about the specimen direction. Diffraction contrast studies were then limited to a few chance orientations and many analytical questions remained unresolved. A second othogonal tilt axis, of even modest range thus enhances the possibilities considerably. The double tilt holder described here covers the angular range ± 20° on the orthogonal or Y-axis. In addition, the wire specimen can be remounted at any rotated position so that the experimentally accessible range is ± 180°. This combined angular range is sufficient for most diffraction contrast experiments. More to the point, it permits the attainment of a number of two-beam conditions. The JEOL 200CX used here also has a combined EDS and ELS capacity and the FIM is configured as an imaging atom probe (IAP).

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