中文摘要：

红外地平仪提供了卫星星体相对于地球的姿态测量信息．受它在星体上安装精度限制、测量系统噪声和在轨期间星体质量分布变化的影响，直接使用红外测量值进行姿态计算会引入上述误差．如果只采用红外测量的差分值进行姿态计算，再通过滤波，就可以消除上述误差后得到高精度卫星姿态，这种方法充分利用了地球同步在轨卫星位置定点和姿态指向特性，对在轨运行卫星进行长时间姿态确定和实际控制结果表明该方法得到的姿态精度高于0．01°，显著提高了红外定姿精度．

英文摘要：

Infrared earth sensors are installed onboard satellite to measure the vector information. The on - board assembly inaccuracy, measurement error and the mass distribution variation contribute errors to the attitude result computed by the traditional geometrical algorithm. By taking the advantage of constant distance between on-orbit geostationary spin-atabilized satellites and the earth and the special attitude whose orientation points toward the orbital normal of possible, a novel method was proposed here. The on-orbit satellite attitude only with differential value measured by an onboard infrared earth sensor was calculated. Consequently, the measurement system error can be eliminated. After preprocessing the measurements, the contribution of arbitrary error of measurements to the final result can be decreased to the minimum. Therefore high accurate attitude（ the order of 0.01°） can be got. The new method has been used to determinate and control China on-orbit geostationary FY2 series satellites.