基于蒙特卡罗法的轻气炮射击精度评估

天基轻气炮因性能稳定、易于小型化等特点为空间攻防及空间碎片主动防护提供了一种更加有效的途径.天基轻气炮完成任务的首要前提是实现对空间高速运动目标的精确打击.为全面、准确地对天基轻气炮射击精度进行评估,首先建立天基轻气炮射击误差源分布模型,确定了射击准确度、密集度、命中概率等评价指标.然后,提出天基轻气炮射击精度评估的一般框架,包括设计仿真打靶试验,通过外弹道轨迹计算脱靶量,对脱靶量数据进行预处理,根据预处理后数据完成准确度、密集度及命中精度估计.最后,根据所设计的框架对高度为10 354 km圆轨道上的目标进行了蒙特卡罗法仿真打靶试验并完成射击精度评估.结果表明在不进行弹丸末制导情况下,射击准确度约为48 m和圆概率误差约为87 m,主要是对非合作目标测定轨引起的误差对射击准确度影响较大,且射程较远导致误差对射击精度的影响被放大.命中概率约为千分之一,且随着目标尺寸增加而增加.

8Firing Accuracy Evaluation of Light Gas Gun Based on Monte Carlo Method

Space based light gas gun (SLGG) provides a more effective way for space attack and defense and space debris removal due to its stable performance and easy miniaturization. The primary precondition of the SLGG to accomplish the task is to strike the space target accurately. To evaluate the firing accuracy comprehensively and accurately, firstly, the shooting error distribution model is established. Three firing accuracy evaluation factors, including shooting accuracy, dispersion and hit probability are formulated. Then, a general framework, including simulation fire test, data preprocessing, fire accuracy evaluation, is proposed to evaluate SLGG firing accuracy. Finally, firing accuracy evaluation of the target with circular orbit at the height of 10354 km is performed via the designed framework. The results reveal that the firing accuracy is about 48 meters and CEP is about 87 meters under current defined scenarios. The errors are mainly caused by the orbit determination of non cooperative target. Moreover, the influence of errors on firing accuracy is amplified due to the long range. The hit probability is about one in a thousand, and increases with the increase of target size.