{'fraction_non_alphanumeric': 0.020477815699658702, 'fraction_numerical': 0.0, 'mean_word_length': 4.59047619047619, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
CCD star sensors for Indian remote sensing satellites

Indian remote sensing satellites (IRS) carry a set of star sensors using CCDs for precise determination of satellite attitude. The star sensor data is used for precision annotation of imagery received from the satellite. These satellites are three-axis stabilized in polar sun- synchronized orbits. Two types of star sensors have been developed. The first type is based on a linear CCD and the second one is based on an area CCD. They use thermo-electric coolers to cool the detectors. A comparison of both configurations is given.