标题： 极点估计和使用纬圈投影的光学导航 显示英文标题

标题： Pole Estimation and Optical Navigation using Circle of Latitude Projections

摘要： 旋转天体（如小行星）和带有带状大气的球状行星（如木星）的图像可能包含可以用作纬圈（CoL）的特征。这些CoL在航天器上搭载的相机或望远镜收集的图像中投影为椭圆。 本文展示了如何利用纬圈投影来确定自旋小行星的极点取向和协方差。 对于已知的被建模为扁球体的行星，展示了如何使用类似的纬圈投影来进行航天器定位。 这些方法是基于射影几何原理开发的。 为贝努小行星（用于极点取向）和木星（用于航天器定位）的模拟图像提供了数值结果。 显示英文摘要

摘要： Images of both rotating celestial bodies (e.g., asteroids) and spheroidal planets with banded atmospheres (e.g., Jupiter) can contain features that are well-modeled as a circle of latitude (CoL). The projections of these CoLs appear as ellipses in images collected by cameras or telescopes onboard exploration spacecraft. This work shows how CoL projections may be used to determine the pole orientation and covariance for a spinning asteroid. In the case of a known planet modeled as an oblate spheroid, it is shown how similar CoL projections may be used for spacecraft localization. These methods are developed using the principles of projective geometry. Numerical results are provided for simulated images of asteroid Bennu (for pole orientation) and of Jupiter (for spacecraft localization).