Abstract
Attitude jitter is a common phenomenon in the application of high resolution satellites, which may result in large errors of geo-positioning and mapping accuracy. Therefore, it is critical to detect and compensate attitude jitter to explore the full geometric potential of high resolution satellites. In this paper, a framework of jitter detection and compensation for high resolution satellites is proposed and some preliminary investigation is performed. Three methods for jitter detection are presented as follows. (1) The first one is based on multispectral images using parallax between two different bands in the image; (2) The second is based on stereo images using rational polynomial coefficients (RPCs); (3) The third is based on panchromatic images employing orthorectification processing. Based on the calculated parallax maps, the frequency and amplitude of the detected jitter are obtained. Subsequently, two approaches for jitter compensation are conducted. (1) The first one is to conduct the compensation on image, which uses the derived parallax observations for resampling; (2) The second is to conduct the compensation on attitude data, which treats the influence of jitter on attitude as correction of charge-coupled device (CCD) viewing angles. Experiments with images from several satellites, such as ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiaometer), LRO (Lunar Reconnaissance Orbiter) and ZY-3 (ZiYuan-3) demonstrate the promising performance and feasibility of the proposed framework.
Highlights
Over the past decade, high resolution satellite images obtained from linear array CCD sensor have been widely used in surveying and mapping
ASTER instrument is an imaging camera mounted on the Terra satellite, which was launched on December 1999 as part of NASA’s Earth Observing System (EOS)
The spatial resolution varies with wavelength: 15 m in the visible and near-infrared (VNIR), 30 m in the short-wave infrared (SWIR), and 90 m in the thermal infrared (TIR) [30]
Summary
High resolution satellite images obtained from linear array CCD sensor have been widely used in surveying and mapping. For the sake of accurate geo-positioning and co-registration, good geometric performance is crucial for the processing of satellite data [1,2,3,4]. According to [5,6,7], the accuracy of spacecraft position and attitude are two vital factors that affect geometric performance of high resolution satellites. The spacecraft position is determined by high-accuracy on-board global position system receiver and its accuracy can be enhanced with help of post-processing using accurate ephemeris if the device’s performance cannot meet the requirements or some malfunctions happen [8]. Accurate attitude estimation is a crucial issue for improving the accuracy of geo-positioning and mapping with high resolution satellites
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