Abstract
Abstract. Since SPOT1, the French national space centre (CNES) has worked on improving the geometry of Earth observation spacecrafts. The accuracy of sensor calibration is one of the main key points for any Earth observation application such as orthorectification, DEM generation or surface change detection. For the last twenty years CNES has developed two families of methods: absolute methods and relative methods. These methods are used to characterize a pushbroom acquisition along the detector line and the time line. By this way, the viewing directions are measured and the residual of the spacecraft’s attitude angles (not restituted by the Attitude and Orbit Control System) is estimated. This information can complete the geometric model of all the scenes acquired by the instrument and is used in all geometric applications. This paper presents new attitude assessment methods taking advantage of the capabilities of Pléiades-HR in terms of agility and focal plane arrangement – panchromatic band and multispectral (MS) bands.
Highlights
Since SPOT1, the French national space centre (CNES) has worked on improving the geometry of Earth observation spacecrafts
PLEIADES-HR is the highest resolution civilian earth observing system ever developed in Europe. This imagery program is conducted by the French National Space Agency, CNES
Difficult case: If we consider a simulation with critical frequencies, the method using. All these attitude assessment methods are useful to understand the system and to improve the auxiliary data of products acquired by the system, especially data necessary to build the geometric model
Summary
Since SPOT1, the French national space centre (CNES) has worked on improving the geometry of Earth observation spacecrafts. These methods are used to characterize a pushbroom acquisition along the detector line and the time line By this way, the viewing directions are measured and the residual of the spacecraft’s attitude angles (not restituted by the Attitude and Orbit Control System) is estimated. PLEIADES-HR is the highest resolution civilian earth observing system ever developed in Europe This imagery program is conducted by the French National Space Agency, CNES. Agility is a characteristic which allows the satellite to acquire off-nadir targets rapidly in a large flight envelope, in order to sequence numerous images. This agility is imposed by several requirements stated by the users. These biases are estimated with a block adjustment method using all the tie points computed
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