光学学报, 2020, 40 (22): 2212003, 网络出版: 2020-10-25
基于自适应振动抑制的星载远距离测距跟踪方法研究 下载: 868次
Spaceborne Long-Distance Tracking Method Based on Adaptive Vibration Suppression
测量 激光测距 非合作目标 卫星振动 自适应滤波 跟踪系统 measurement laser ranging non-cooperative target vibration of satellite adaptive filtering tracking system
摘要
在星载远距离非合作目标测距领域中,目标常常为暗弱目标,成像帧频有限,因此目标跟踪能力受限并影响测距范围。在星载远距离非合作目标跟踪过程中,跟踪误差主要来自于本体振动。为了增强系统主动振动抑制能力,提高系统的跟踪精度,使用自适应控制来实现目标的跟瞄控制。对于不同频率传感器数据难以融合的问题,通过采用降采样的方法实现了低频相机数据和高频惯性传感器数据的自适应融合,并证明了降采样下自适应滤波的有效性和正确性。在算法实现层面,针对经典自适应算法收敛速度慢和稳态精度差的问题,通过选用仿射投影算法实现了数据融合。在数据融合仿真中,采用卫星微振动模型,验证了融合方法的收敛速度及跟踪精度。最后将该方法应用到实际跟踪系统中,实验结果显示,跟踪精度优于5 μrad,满足远距离非合作目标测距中的跟踪精度要求。
Abstract
In the field of spaceborne long-distance non-cooperative target ranging, usually the target is weak and the imaging frame rate is limited, and thus the target tracking ability is limited and influences the ranging distance. When the spaceborne long-distance non-cooperative target is tracked, the main source of tracking errors is body vibration. In order to enhance the active vibration suppression ability and improve the tracking accuracy of the system, adaptive control is used to realize aiming control of targets. Aiming at the problem of difficult data fusion among different frequency sensors, we use down-sampling to achieve adaptive fusion of low-frequency camera data and high-frequency inertial sensor data, and simultaneously confirm the effectiveness and correctness of adaptive filtering under down-sampling. At the level of algorithm implementation, an affine projection algorithm is selected to achieve data fusion considering the problems of slow convergence and poor steady-state accuracy of the classical adaptive algorithm. In the data fusion simulation, the micro-vibration model of the satellite is used to verify the convergence speed and the tracking accuracy of the fusion method. Finally, this method is applied for the actual tracking system and the experimental results show that the tracking accuracy is superior to 5 μrad, which meets the tracking accuracy requirement of long-distance non-cooperative target ranging.
贾远东, 强佳, 张亮, 贾建军. 基于自适应振动抑制的星载远距离测距跟踪方法研究[J]. 光学学报, 2020, 40(22): 2212003. Yuandong Jia, Jia Qiang, Liang Zhang, Jianjun Jia. Spaceborne Long-Distance Tracking Method Based on Adaptive Vibration Suppression[J]. Acta Optica Sinica, 2020, 40(22): 2212003.