PLEIADES HR are High Resolution satellites for Earth observation. Placed at 695km they reach a 0.7m spatial resolution. To allow such performances, the detectors are working in a TDI mode (Time and Delay Integration) which consists in a continuous charge transfer from one line to the consecutive one while the image is passing on the detector. <p> </p>The spatial resolution, one of the most important parameter to test, is characterized by the MTF (Modulation Transfer Function). Usually, detectors are tested in a staring mode. For a higher level of performances assessment, a dedicated bench has been set-up, allowing detectors’ MTF characterization in the TDI mode. Accuracy and reproducibility are impressive, opening the door to new perspectives in term of HR imaging systems testing.
Recent and future needs for high spatial resolution lead to increase the pupil diameters and the focal lengths of space
telescopes. In parallel, considerable efforts have been realised in the field of image processing by developing techniques
which require high levels of performances characterization. The main consequences are the increase of the size of the
Ground Support Equipments and facilities but also the mastering of the influence of the environment which becomes
more and more fundamental. Wavefront and contrast measurements are two conventional but key tests which require constant evolution to be adapted to new needs.