Research and Implementation of high accuracy timing method based on GPS PPS in spaceborne remote sensing cameras

Abstract

Abstract. As requirements of stereo-positioning accuracy of high resolution remote sensing cameras becoming higher and higher, the timing accuracy of imaging should be within a few micro-seconds. However, imaging timing accuracy is easily influenced by frequency drift due to aging of clock sources and temperature variation. In this paper, a high accuracy timing method based on GPS PPS is proposed. According to the timing accuracy analysis, the proposed timing method has higher accuracy compared with conventional timing method. The timing method is illustrated in detail and test results show that the optimal timing method can improve timing accuracy up to higher level which can be used in the field of high resolution remote sensing cameras.