3D流星体轨迹
3D Meteoroid Trajectories
摘要：
火球数据的流星体建模通常使用沿直线三角形轨迹的一维模型。直线轨迹的假设被认为是火球的可接受的简化，但它还没有经过严格的测试。沙漠火球网络（DFN）的独特能力，三角测量离散的观测时间提供了机会，调查流星体的位置偏差不同的模型拟合。在这里，我们评估的可行性直线假设的火球数据在两个流星下降测试情况下观察到的沙漠火球网络（DFN）在澳大利亚-一个超过21秒（\textit{DN151212\_03}），一个在5秒（\textit{DN160410\_03}）。我们表明，直线是无效的，这两个陨石坠落事件，并提出了一个三维粒子滤波器模型流星体的位置，没有任何直线的约束。在三维的单体方程，随着光度方程，适用于粒子滤波方法描述的\citet{Sansom2017}。在三维中对火球相机网络数据进行建模以前还没有尝试过。这使得原始的天体测量，视线观测直接纳入。在分析这两个DFN事件时，基于直线假设的三角位置导致模拟流星体位置从计算的观测点（对于\textit{DN151212\_03}）发散到$3.09\, km$。即使对于更典型的火球事件\textit{DN160410\_03}，我们也可以看到高达$360$ \，m的发散。由于DFN观测通常精确到$<100$ \，m，很明显，直线的假设过于简单，会影响轨道计算和陨石搜索区域的一个显着的事件的一部分。
英文摘要：
Meteoroid modelling of fireball data typically uses a one dimensional model along a straight line triangulated trajectory. The assumption of a straight line trajectory has been considered an acceptable simplification for fireballs, but it has not been rigorously tested. The unique capability of the Desert Fireball Network (DFN) to triangulate discrete observation times gives the opportunity to investigate the deviation of a meteoroid's position to different model fits. Here we assess the viability of a straight line assumption for fireball data in two meteorite-dropping test cases observed by the Desert Fireball Network (DFN) in Australia -- one over 21 seconds (\textit{DN151212\_03}), one under 5 seconds (\textit{DN160410\_03}). We show that a straight line is not valid for these two meteorite dropping events and propose a three dimensional particle filter to model meteoroid positions without any straight line constraints. The single body equations in three dimensions, along with the luminosity equation, are applied to the particle filter methodology described by \citet{Sansom2017}. Modelling fireball camera network data in three dimensions has not previously been attempted. This allows the raw astrometric, line-of-sight observations to be incorporated directly. In analysing these two DFN events, the triangulated positions based on a straight line assumption result in the modelled meteoroid positions diverging up to $3.09\, km$ from the calculated observed point (for \textit{DN151212\_03}). Even for the more typical fireball event, \textit{DN160410\_03}, we see a divergence of up to $360$\,m. As DFN observations are typically precise to $<100$\,m, it is apparent that the assumption of a straight line is an oversimplification that will affect orbit calculations and meteorite search regions for a significant fraction of events.
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