空间失稳目标线阵激光成像建模及参数优化

线阵激光成像雷达兼具激光测距和线阵成像的优点,是空间失稳目标远距离精密测量的重要工具,其获取的线阵图像既能用于运动估计也能用于空间目标三维测量。为模拟不同平面分辨率线阵激光成像雷达对空间失稳目标的数据采集,本文根据线阵激光成像雷达的成像机制及空间失稳目标的运动规律提出了一般性的空间失稳目标线阵激光成像建模方法,为不同地面验证方案提供了数据支持。同时,为优化雷达参数选取,本文通过计算单位区域特征获取率提出了一种基于数据采集完整性评估的线阵激光成像雷达参数优化方法,实验分析了与成像分辨率相关的性能参数对多种运动形式空间失稳目标数据采集的完整性。实验结果显示数据采集完整性与线阵规模及采样频率正相关,在线阵规模达到100元以上、采样频率200Hz以上,与空间目标自身运动形式几乎无关,建立的对应关系将为参数优化提供指导和参考依据。

A general linear imaging modeling method for space unstability targets and parameter optimization of linear laser radar

With the advantages of laser ranging and linear imaging, the linear imaging radar is applied to precisely measure long distance space unstability targets. The captured linear images can be used for both motion estimation and 3D measurement of space targets. In order to simulate the data acquisition of space unstability target with different plane resolution linear imaging radar, this paper presented a general linear imaging modeling method for space unstability targets based on the imaging mechanism of the linear imaging radar and motion law of space unstability targets, which could provide data support for various ground-based verification schemes. Furthermore, in order to optimize the selection of parameter of linear imaging radar, this paper alsoprovided an effective method for the selection of parameter by calculating the characteristics points collection per unit and then evaluating the integrity of data acquired. The experimental results illustrated that the integrity of data acquired had positive correlation with imaging resolution and sampling frequency. In addition to the above, when the sample frequency was faster than 200 Hz and the imaging resolution was more than 100, the correlation with the individual motions of space targets was negligible. By establishing the relationship between the integrity of data acquired and parameter related with linear imaging, the method presented in this papercan provide guidance and reference for parameter optimization.