A space laser communication acquisition,pointing and tracking(APT)system based on the beacon laser is designed without prior information.And then,a new target scanning method and a pointing and tracking algorithm are ...A space laser communication acquisition,pointing and tracking(APT)system based on the beacon laser is designed without prior information.And then,a new target scanning method and a pointing and tracking algorithm are proposed.The target scanning mode is the round-trip triangular wave scanning,and it means that scanning track of the PAN-TILT platform follows the triangular wave repeatedly.For the pointing and tracking algorithm,the beacon laser is used as the auxiliary aiming light source.The position of the beacon laser in the viewfield of the complementary metal oxide semiconductor(CMOS)camera is calculated by the centroid algorithm.In order to realize the target tracking,the joint control method of the angle control and the angular velocity control is used.The simulation and experimental results show that the APT system can achieve full coverage scanning in the scanning area and capture the target in one scanning cycle successfully.After capturing the PAN-TILT platform,the pointing and tracking algorithm can track the PAN-TILT platform quickly and accurately,and the tracking accuracy is up to 0.22 mrad.展开更多
Due to the proliferation of underwater vehicles and sensors,underwater wireless optical communication(UWOC)is a key enabler for ocean exploration with a strong reliance on short-range bandwidth-intensive communication...Due to the proliferation of underwater vehicles and sensors,underwater wireless optical communication(UWOC)is a key enabler for ocean exploration with a strong reliance on short-range bandwidth-intensive communications.A stable optical link is of primary importance for UWOC.A compact,low-power,and low-cost acquisition,pointing,and tracking(APT)system is proposed and experimentally demonstrated to realign the optical link within 0.04 s,even when the UWOC transmitter and receiver are in relative motion.The system successfully achieves rapid auto-alignment through a 4 m tap water channel with a relatively large number of bubbles.Furthermore,the required minimum illumination value is measured to be as low as7.1 lx,implying that the proposed APT scheme is robust to dim underwater environments.Meanwhile,mobility experiments are performed to verify the performance of the APT system.The proposed system can rapidly and automatically align moving targets in complex and unstable underwater environments,which can potentially boost the practical applications of UWOC.展开更多
A compensation implementation scheme of the advanced targeting process based on the fine tracking system is proposed in this paper.Based on the working process of the quantum positioning system(QPS)and its acquisition...A compensation implementation scheme of the advanced targeting process based on the fine tracking system is proposed in this paper.Based on the working process of the quantum positioning system(QPS)and its acquisition,tracking and pointing(ATP)system,the advanced targeting subsystem of the ATP system is designed.Based on six orbital parameters of the quantum satellite Mozi,the advanced targeting azimuth angle and pitch angle are transformed into the dynamic tracking center of the fine tracking system in the ATP system.The deviation of the advanced targeting process is analyzed.In the Simulink,the simulation experiment of the ATP system considering the deviation compensation of the advanced targeting is carried out,and the results are analyzed.展开更多
针对空间光通信捕获、跟踪、对准(acquisition,tracking,pointing,ATP)系统的精跟踪单元高度复杂、被控对象参数模型难以精确获得、存在慢变化随机干扰的特点,提出采用自校正PID(proportional,integral and derivative)控制来设计精跟...针对空间光通信捕获、跟踪、对准(acquisition,tracking,pointing,ATP)系统的精跟踪单元高度复杂、被控对象参数模型难以精确获得、存在慢变化随机干扰的特点,提出采用自校正PID(proportional,integral and derivative)控制来设计精跟踪的控制器,改善了系统动态性能,增强了系统对不确定因素的适应性。采用遗忘因子递推最小二乘法来进行参数辨识,能在线调整适应对象参数的变化,增强了系统的适应性和鲁棒性。通过仿真验证了算法的控制性能和参数辨识效果,算法的实时性也满足系统设计的要求。给出了ATP精跟踪系统的设计框图,进行了2.3 km的精跟踪实验。实验结果表明精跟踪系统采用自校正PID控制有较好的跟踪精度。展开更多
基金National Natural Science Foundation of China(No.52173219)。
文摘A space laser communication acquisition,pointing and tracking(APT)system based on the beacon laser is designed without prior information.And then,a new target scanning method and a pointing and tracking algorithm are proposed.The target scanning mode is the round-trip triangular wave scanning,and it means that scanning track of the PAN-TILT platform follows the triangular wave repeatedly.For the pointing and tracking algorithm,the beacon laser is used as the auxiliary aiming light source.The position of the beacon laser in the viewfield of the complementary metal oxide semiconductor(CMOS)camera is calculated by the centroid algorithm.In order to realize the target tracking,the joint control method of the angle control and the angular velocity control is used.The simulation and experimental results show that the APT system can achieve full coverage scanning in the scanning area and capture the target in one scanning cycle successfully.After capturing the PAN-TILT platform,the pointing and tracking algorithm can track the PAN-TILT platform quickly and accurately,and the tracking accuracy is up to 0.22 mrad.
基金the National Natural Science Foundation of China(NSFC)(Nos.61971378 and 61671409)National Key Research and DevelopmentProgram of China(Nos.2016YFC1401202,2017YFC0306601,and2017YFC0306100)Strategic Priority Research Program of the ChineseAcademy of Sciences(No.XDA22030208)。
文摘Due to the proliferation of underwater vehicles and sensors,underwater wireless optical communication(UWOC)is a key enabler for ocean exploration with a strong reliance on short-range bandwidth-intensive communications.A stable optical link is of primary importance for UWOC.A compact,low-power,and low-cost acquisition,pointing,and tracking(APT)system is proposed and experimentally demonstrated to realign the optical link within 0.04 s,even when the UWOC transmitter and receiver are in relative motion.The system successfully achieves rapid auto-alignment through a 4 m tap water channel with a relatively large number of bubbles.Furthermore,the required minimum illumination value is measured to be as low as7.1 lx,implying that the proposed APT scheme is robust to dim underwater environments.Meanwhile,mobility experiments are performed to verify the performance of the APT system.The proposed system can rapidly and automatically align moving targets in complex and unstable underwater environments,which can potentially boost the practical applications of UWOC.
基金supported by the National Natural Science Foundation of China(61973290).
文摘A compensation implementation scheme of the advanced targeting process based on the fine tracking system is proposed in this paper.Based on the working process of the quantum positioning system(QPS)and its acquisition,tracking and pointing(ATP)system,the advanced targeting subsystem of the ATP system is designed.Based on six orbital parameters of the quantum satellite Mozi,the advanced targeting azimuth angle and pitch angle are transformed into the dynamic tracking center of the fine tracking system in the ATP system.The deviation of the advanced targeting process is analyzed.In the Simulink,the simulation experiment of the ATP system considering the deviation compensation of the advanced targeting is carried out,and the results are analyzed.
文摘针对空间光通信捕获、跟踪、对准(acquisition,tracking,pointing,ATP)系统的精跟踪单元高度复杂、被控对象参数模型难以精确获得、存在慢变化随机干扰的特点,提出采用自校正PID(proportional,integral and derivative)控制来设计精跟踪的控制器,改善了系统动态性能,增强了系统对不确定因素的适应性。采用遗忘因子递推最小二乘法来进行参数辨识,能在线调整适应对象参数的变化,增强了系统的适应性和鲁棒性。通过仿真验证了算法的控制性能和参数辨识效果,算法的实时性也满足系统设计的要求。给出了ATP精跟踪系统的设计框图,进行了2.3 km的精跟踪实验。实验结果表明精跟踪系统采用自校正PID控制有较好的跟踪精度。
