关键词: 摆动式扫描红外地球敏感器；探头级备份；姿态确定；可靠性

Abstract: For a swing infrared earth sensor (IRES), the characteristics of the chord information from each single channel are given when only two bolometer detectors work. An attitude determination method is proposed using the chord information of the two bolometer detectors, and the bolometer detector redundancy is also discussed. The simulation and experimental results indicate that the attitude determination method is very simple and practicable in engineering application. Meanwhile，the detector redundancy improves the reliability of the IRES.