关键词: 地影, 自旋卫星, 起旋转速确定, 风云二号

Abstract:  The spinning satellite must actively rotate after satelliterocket separation, so the calculation of the spinning rate is the premise to judge the spin of the satellite. The sun sensor is the most effective method to calculate the spinning rate after satelliterocket separation, but it is disabled when the satelliterocket separation is under shadow, which is a new question for the calculation of the spinning rate. There are also earth sensor and acceleration sensor on the spinning satellite. The acceleration sensor is used for the nutation measure; if the nutation motion is weak, it cannot feel the cycle of the sine signal, so it is uncertain for the spinning rate calculation. Earth sensor is usually used on synchronous orbit; but when satelliterocket separation happens, the orbit height is too low and the counter will overflow. The method in this text uses the cycle integration to calculate the spinning rate when the counter overflows. This method is used on FY2(09) satellite, and it is also a reference for the application of the earth sensor in different orbit.