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	Measurement and Correction of Pointing Error Caused by Radio Telescope Alidade Deformation based on Biaxial Inclination Sensor 期刊论文 OAI收割 MICROMACHINES, 2023, 卷号: 14, 期号: 7, 页码: 14 作者: Xu, Qian; Xue, Fei; Wang, Hui; Yi, Letian \| 收藏 \| 浏览/下载：10/0 \| 提交时间：2023/11/21 inclinometer pointing errors radio telescope alidade thermal gradients track unevenness
	Design and analysis of performance of FSO communication system based on partially coherent beams 期刊论文 OAI收割 OPTICS COMMUNICATIONS, 2020 作者: Wu, Yan; Mei, Haiping; Dai, Congming; Zhao, Fengmei; Wei, Heli \| 收藏 \| 浏览/下载：36/0 \| 提交时间：2020/10/19 Free space optical communication Partially coherent beams Exponentiated Weibull turbulence Generalized pointing errors System performance parameters
	Using Allan Variance Based Semi-Parameter Model to Calibrate Pointing Errors of Alt-az Telescopes 期刊论文 OAI收割 APPLIED SCIENCES-BASEL, 2018, 卷号: 8, 期号: 4, 页码: 614 作者: Lingjie Yan; Yongmei Huang; Yahui Zhang \| 收藏 \| 浏览/下载：34/0 \| 提交时间：2019/08/23 alt-az telescopes LOS pointing errors nonlinear error mount model Allan variance Allan variance based semi-parameter model
	Research on satellite platform vibration compensation method based on liquid crystal steering system (EI CONFERENCE) 会议论文 OAI收割 2011 SSITE International Conference on Future Material Research and Industry Application, FMRIA 2011, December 1, 2011 - December 2, 2011, Macau, China 作者: Wen M. 收藏 \| 浏览/下载：13/0 \| 提交时间：2013/03/25 This paper presents the disturbance compensation scheme based on liquid crystal steering system according to the problem that satellite platform vibration affects the tracking and pointing accuracy in space optical communication. The mathematical model of liquid crystal steering system is built. For improving convergence speed the adaptive controller based on posteriori estimation errors RLS lattice filter is designed which not only achieves fast adaptation but also reaches optimal steady-state disturbance compensation. Finally the simulation results show that this control scheme is valid and feasible. (2012) Trans Tech Publications Switzerland.
	Effect of gimbal point displacement on optical axis pointing precision in an image seeker (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China 作者: Zhang X.; Zhang X.; Zhang X. 收藏 \| 浏览/下载：37/0 \| 提交时间：2013/03/25 A concentric glass spherical dome was usually chosen as the transparent window mounted in front of the optical lens in an image seeker. However optical ray had to change its direction when propagating through the dome due to refraction unless passing through the center of the dome which demanded gimbal point coincide with the center of the dome exactly. In fact gimbal point displacement could not be eliminating due to fabrication assembly and vibration therefore the optical axis pointing error generated. In this paper the effect of gimbal point displacement on optical axis pointing precision in an image seeker was analyzed and the theoretical expression of the optical axis pointing error was derived based on geometric optics and the error dynamics was explored by numerical. Take a visible light image seeker as a case the thickness of concentric glass spherical dome was 8mm and the inner radius was 72mm and the optical axis pointing errors varying dynamically with the look angle and the gimbal point displacement were shown in graph. When the gimbal displacement was 0.11mm the maximum optical axis pointing error was 0.054mrad that is equal to the instantaneous field of view (IFOV) corresponding to the camera system whose focal length was 120mm and pixel size was 6.5m. Furthermore with the gimbal displacement increasing the optical axis pointing error increased linearly. The analyzed results provided a theoretical basis for the displacement range which had to be limited strictly in the gimbal design process. 2011 IEEE.
	Gimbal displacement error analysis on an electro-optical seeker (EI CONFERENCE) 会议论文 OAI收割 Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China 作者: Zhang X.; Zhang X.; Zhang X. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 It is essential to analyze the gimbal displacement errors for a seeker due to the importance for cueing of targets and tracking for the final approach. Otherwise for a seeker electro-driven with a concentric glass dome the large errors will decrease the picking pointing and tracking precision rooted from the displacement errors existing between the rotation center of the optical system and the gimbal. And the gimbaled camera system displacement errors are never eliminated but reduced due to the geometric errors consists of geometric tolerances of gimbal structure manufacture installation and vibration coming from working environment. In this paper the gimbal displacement errors in an electro-optically stabilized platform resulting from geometric errors and environment errors were analyzed and shown in detail. The mathematical modal of the gimbal displacement errors created based on multi-body dynamics demonstrated the connection between the gimbal displacement errors and the stabilized platform. Taking a visible light image seeker as a case the diameter is 120mm and the geometric tolerances came from the values of primary design and the vibration data came from the environmental vibration test on the pitch-yaw seeker and at the same time the errors resulting from installation were considered too. Based on calculating the maximum gimbal displacement error will reach to 0.2mm for pitching angle smaller than 40 and yawing angle smaller than 60. However the critical parts have been found out according to the probability theory and the reliability analysis successfully used in the paper and finally the maximum gimbal displacement error reduced to 0.1mm which is acceptable corresponding to the picking pointing and tracking precision for an optical imaging seeker. 2010 Copyright SPIE - The International Society for Optical Engineering.
	Orientation error analysis of alt-alt photoelectric telescope (EI CONFERENCE) 会议论文 OAI收割 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 19, 2008 - November 21, 2008, Chengdu, China 作者: Wu X.-X. 收藏 \| 浏览/下载：31/0 \| 提交时间：2013/03/25 In order to ascertain the effects of main errors of alt-alt photoelectric telescope on measurement accuracy orientation error is analyzed.For analyzing optical mechanical and electrical errors from measured target to telescope picture we construct 7 coordinates such as:the earth's core coordinate alt-alt coordinate etc. carry through 21 times coordinate transformation form measuring equation with 26 variables. and we utilize Monte Carlo method to calculate the orientation error analyze the effects of errors upon pointing. The result indicates that the measuring error standard deviation of alt-alt telescope is minimum value about 10? at the zenith zone. and the deviation increases with the rotation angles of longitude and latitude axes. The model and the method not only can analyze and synthesize the main errors but also provide a reference to the whole design. 2009 SPIE.