Research Projects

High resolution satellite images obtained from linear array CCD sensor have been widely used in surveying and mapping. For satellites equipped with CCD linear array sensorsthe attitude jitter, refers to the instability and distortion of satellite attitude, could deteriorate the mapping accuracy of high resolution satellites in both plane and height. For the majority of remote sensing satellites currently in use, the attitude information is estimated by interpolating the measurement data of startracker and gyros sampled at a relatively low frequency. As the frequency of satellite jitter is higher than the sampling rate of attitude data, the geometric processing of imagery would be affected by the undetected and uncompensated attitude distortions. Moreover, the requirement of attitude stability will become more and more severe with increasing spatial resolution of remote-sensing missions. Therefore, it is necessary to estimate and correct the spacecraft attitude jitter information accurately with additional methods in order to improve the geometric performance of satellite images.