摘要
坐标系转换是实现应用导航数据进行卫星遥感影像高精度定位的关键技术。文章利用航天器定义在地心固定坐标系下位置和速度信息,应用四元数(Quaternion)方法,实现从航天器轨道坐标系到地心固定坐标系的直接转换。在常规遥感影像直接定位算法中这样的转换分为两次坐标系旋转,先从轨道到地心惯性,然后从地心惯性到地心固定坐标系。文中提出的方法将这两次坐标系转换缩减为一个,并且避免了应用地球的章动、极移和岁差等信息。通过跟传统坐标系转换方法转换结果以及商业软件STK(Satellite Tool Kit)定位结果的比较,证明了该方法的正确性和实用性,适合于低轨对地观测平台的遥感影像定位,因为低轨平台提供了定义在地心固定坐标系下的位置和速度信息。
Coordinate transformation is key steps of the precise geolocation of the satellite remote sensing imagery using navigation dataset. By utilizing the sensor’s position and velocity defined in the earth-centered and earth-fixed （ECEF） reference frame, the transformation from orbital reference frame to ECEF can be performed directly by using quaternion. In traditional direct geolocation algorithm of remote sensing imagery, this transformation usually includes two steps： transformation from orbital to earth centered initial （ECI）, and from ECI to ECEF reference frame. The proposed method in this paper reduces the two transformations into one, namely, transforming from orbital to ECEF directly, thus avoiding using the earth’s nutation, precession, and polar motion which are difficult to obtain for the transformation from ECI to ECEF reference frame. Comparing with the transformed results using the traditional method, and geolocation results simulated using commercial satellite tool kit （STK） software suggested that the proposed method is correct. The proposed method is suited for positioning remote sensing image obtained on earth observing platform in low earth orbit, for the LEO vehicle’s position and velocity information defined in the ECEF reference frame is provided.
出处
《航天返回与遥感》
北大核心
2016年第5期86-94,共9页
Spacecraft Recovery & Remote Sensing
基金
国家自然科学基金(41201481)
关键词
坐标系转换
四元数
轨道坐标系
地心固定坐标系
空间向量旋转
遥感应用
coordinate system transformation
quatemion
spacecraft orbital reference frame
Earth-centered and Earth-fixed reference frame
rotation of space vector
remote sensing applications
