中国开放科研知识云: 检索

Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel 期刊论文
International Journal of Antennas and Propagation, 2020, 卷号: 2020
作者: Zhang, Yue; Wang, Huiqin; Cao, Minghua; Bao, Zhongxian

收藏 | 浏览/下载：11/0 | 提交时间：2020/11/14

Atmospheric turbulence Bit error rate Errors Fading channels Approximate expressions Atmospheric attenuation Correlated fading channels Ergodic channel capacity Exponential correlation Multiple pulse position modulation Performance degradation Pointing , acquisition , and tracking

Shipborne Acquisition, Tracking, and Pointing Experimental Verifications towards Satellite-to-Sea Laser Communication 期刊论文
APPLIED SCIENCES-BASEL, 2019, 卷号: 9, 期号: 18
作者: He, Dong; Wang, Qiang; Liu, Xiang; Song, Zhijun; Zhou, Jianwei

收藏 | 浏览/下载：11/0 | 提交时间：2021/05/06

satellite-to-sea laser communication acquisition tracking and pointing shipborne ATP pointing error model

A Real-Time Orbit Determination Method for Smooth Transition from Optical Tracking to Laser Ranging of Debris 期刊论文
SENSORS, 2016, 卷号: 16, 期号: 7
作者: Li, Bin; Sang, Jizhang; Zhang, Zhongping

收藏 | 浏览/下载：3/0 | 提交时间：2019/12/05

debris laser tracking telescope pointing angular data orbit determination and prediction

Design and Experiment for Realization of Laser Wireless Power Transmission for Small Unmanned Aerial Vehicles 会议论文
作者: Chen, Qi; Zhang, Dechen; Zhu, Dandi; Shi, Qianyun; Gu, Jian

收藏 | 浏览/下载：2/0 | 提交时间：2019/12/05

Wireless laser power transmission Photoelectric conversion UAV Charging module Acquiring pointing and tracking

Research on satellite platform vibration compensation method based on liquid crystal steering system (EI CONFERENCE) 会议论文
2011 SSITE International Conference on Future Material Research and Industry Application, FMRIA 2011, December 1, 2011 - December 2, 2011, Macau, China
Li X.; Han C.; Wen M.; Zhao Q.; Jiang X.

收藏 | 浏览/下载：10/0 | 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.

Adaptive pyramid mean shift for global real-time visual tracking 期刊论文
IMAGE AND VISION COMPUTING, 2010, 卷号: 28, 期号: 3, 页码: 424-437
作者: Li, Shu-Xiao; Chang, Hong-Xing; Zhu, Cheng-Fei

收藏 | 浏览/下载：13/0 | 提交时间：2015/08/12

Global visual tracking Fast mean shift Adaptive level Kernel-based tracking Tracking and pointing subsystem

Feed-forward control to stabilize optical axis based on accelerometer (EI CONFERENCE) 会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Wenfeng B.; Juan C.; Hu W.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

In the optoelectronic tracking system the azimuth and elevation system determine the pointing precision of the optical axis. We discuss how to stabilize the optical axis by apply the feed forward control based on the accelerometer output. Both the acceleration and speed are applied to the compound controller. The experimental results show that when the azimuth servo system works at maximum speed 50/s and maximum accelerate 30/s2 the maximum tracking error of the system is 1.08' with the feed forward compensation so the precision is increased 6 times compared to that of without compound control. 2010 IEEE.

Gimbal displacement error analysis on an electro-optical seeker (EI CONFERENCE) 会议论文
Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China
Jiang Z.; Zhang X.; Ai X.; Wei Q.; Jia H.

收藏 | 浏览/下载：24/0 | 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.

Kalman filter for pointing deviation delay compensation in a TV tracker (EI CONFERENCE) 会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Juan C.; Wang Q.-P.; Jian C.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Considering the pointing deviation delay in the TV tracker which heavily worsens the tracking precision here we offer an improved Kalman filter algorithm to compensate the delay. The output speed from the filter is fed forward to the speed loop for the compound control to increase the speed constant. The simulation results based on the experiment data show that the method can effectively estimate the position consequently the speed and accelerate and the tracking precision is improved. The estimation precision of the speed and accelerate depend on that if the state model is coherent with the movement of the real target. 2010 IEEE.

卫星激光通信Ⅰ链路和终端技术 期刊论文
中国激光, 2007, 卷号: 34, 期号: 1, 页码: 3, 20
刘立人

收藏 | 浏览/下载：812/164 | 提交时间：2009/09/18

星间激光通信 intersatellite laser communications 星地激光通信 satellite-to-ground laser communications 光学瞄准捕获跟踪 optical pointing 非相干光通信 acquisition and tracking (PAT) 零差相干光通信 incoherent optical transmission coherent optical BPSK homodyne transmission

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