以天基监视为背景，主要研究了一种基于双星双目跟踪方式的空间目标定轨技术，其物理思想为：利用星载光学测量系统获得目标的相对方位指向与角度传感器测量系统获得卫星的姿态角变化和光电跟踪架的随动角信息，通过坐标变换和数据处理解算出目标在地心惯性坐标系中的绝对运动信息。依次从物理模型、坐标体系、定轨原理方面进行了描述和推导，获得了目标在地球坐标系下的测量方程，并且通过对天基监视卫星轨道模型、星载光电跟踪控制模型、光学成像模型分析后，进行了数学建模仿真，计算结果表明该定轨方法的可行性。

A kind of orbit determination technology is mainly researched for space target based on method of tracking with double satellites and double cameras in space- based surveillance. The physical idea is that the absolute motion information of space target in earth coordinate system can be computed completely through a series of coordinate transformations and data process. The data are from relative azimuth point information of target in satellite that are measured with optical measurement devices and information of satellite attitude angles and rotation angles of opto- electrical tracking frame that are sensed by corresponding angle sensors. Measurement equation of target in earth coordinate system is gained after describing physical model, coordinate systems and deriving principle of orbit determination in turn. Furthermore, mathematic simulation is researched after analyzing many models including space- based surveillance satellite orbit, opto- electronic tracking and optical imaging. The computation results show the feasibility of this method.