基于圆球与椭球的地球敏感器地心矢量算法分析

红外成像敏感器代表了新一代敏感器的发展方向。本文介绍了红外成像敏感器光学系统工作原理,对红外成像敏感器光学系统进行简化,利用小孔模型完成了对敏感器光学系统的建模,分别在地球球形模型和旋转椭球模型下进行了地心矢量推导和计算,获得了焦平面内地平圆盘的相关参数的具体表达式,用牛顿迭代法对地心距进行数值计算,比较分析了球形模型与椭球模型在求解地心距精度上的差别,分析了敏感器测量误差对地心矢量精度的影响,以及焦平面内地平圆盘各参数分别对地心距计算精度的影响程度。

Arithmetic Analysis of Geocentric Vector Based on Earth Sensor for Spheral Model and oblate Model

Infrared imaging earth sensor is a new generation of sensor with many advantages.The theory of the infrared imaging earth sensor optic system is introduced,the optic system is simplified and its geometry model based on eyelet model is built.Through deducing and analyzing the geocentric vector based on sphere model and ellipse model respectively,the expression of the earth image parameters on the planar focal plane are given,numerical analysis is supplied to get the geocentric distance,the difference in the precision of geocentric distance between sphere model and oblate model is analyzed,measurement error of ultraviolet sensor is considered when analyzing the geocentric length numeration precision,the effect on the geocentric length numeration precision is analyzed respectively.