| 主权项 |
1. Method for stabilizing a line of sight of an imaging system on-board a satellite, said imaging system comprising:
a telescope arranged to form an image of a scene in a focal plane, according to the line of sight of the imaging system; and at least one matrix image sensor arranged in the focal plane and suitable for capturing successive images in a sequential mode, in which photodetectors of the sensor are successively and individually controlled during an accumulation phase of a detection signal for received radiation, followed by a read phase of an accumulated signal, based on an order for scanning the photodetectors that is repeated in a continuous loop, each repetition of scan of the photodetectors corresponding to a newly captured image, and the read phase for any of the photodetectors being carried out at the same time as the accumulation phase for other ones of the photodetectors;wherein, for several windows, each of which consists of a different subset of adjacent photodetectors within the sensor, each window being smaller than a total use surface of the sensor, an image portion captured in one of the windows during one of the repetitions of the scan of the photodetectors is compared with a reference image content for the same window, so as to characterize a variation of the line of sight between said repetition of the scan of photodetectors and a reference scan, and a new characterization of the variation of the line of sight being obtained separately for each window at each repetition of the scan of the photodetectors;and wherein an orientation of at least part of the imaging system is changed so as to modify the line of sight to compensate, at least partially, for the variation of said line of sight. |
