本文研究如何用磁力矩器控制极地轨道上对地指向卫星的姿态。
This paper studies magnetic control of polar orbiting, nadir pointing satellite.
然而，作为一个极地轨道航天器，Metop差不多只能每一天看一次欧洲。
As a polar orbiting spacecraft, however, Metop sees Europe approximately only once a day.
铱网络使用66低轨卫星在极地轨道485公里以上的海平面。
The Iridium network uses 66 low earth orbit satellites in polar orbits 485 miles above sea level.
极地轨道卫星经两极上空环绕地球运行，期间不断拍摄地球上不同的地区。
Polar-orbiting satellites revolve around the Earth along paths roughly passing over the poles. As they move, they obtain images of different parts of the Earth.
极地轨道气象卫星以大致南北方向环绕地球运行。它的轨迹离地面约数百公里。
Polar-orbiting satellites are low-flying satellites circling the earth in a nearly north-south orbit, at several hundred kilometers above the earth.
探测器围绕极地轨道运行；据推测，兰斯-蒂林效应将在探测器经过赤道的点上一点点地变换。
The probe orbits the Earth's poles; the Lense-Thirring effect is predicted to shift, little by little, the point on the equator crossed by the spacecraft.
它们会定期返回到水面——这时数据将通过极地轨道卫星发送出去——并且不会受到表面冰层的困扰。
They return regularly to the surface (when the data is sent via polar-orbiting satellites) and are untroubled by surface ice.
自2009年12月14日发射升空以来，广角红外线探测望远镜开始环绕绕地球极地轨道并每11秒抓拍一张照片。
Since its launch Dec. 14, 2009, the Wide-Field Infrared Survey Explorer has been circling the Earth in a polar orbit and snapping images every 11 seconds.
根据极地轨道地磁场变化的特性，利用卫星的姿态角和姿态角速率作为反馈信号，提出了一种采用磁力矩器的比例微分(PD)控制规律设计方法。
Taking into account properties of the geomagnetic field, a new PD magnetic control law using the feedback information of attitude Angle and attitude rate is developed.
在极地圆轨道上工作的对地定向磁控小卫星，其动力学方程是一个线性周期系统。
The magnetic control system for polar orbiting, nadir pointing small satellite is studied in this paper. It is shown that the dynamics with magnetic control system is a linear periodic system.
在极地圆轨道上工作的对地定向磁控小卫星，其动力学方程是一个线性周期系统。
The magnetic control system for polar orbiting, nadir pointing small satellite is studied in this paper. It is shown that the dynamics with magnetic control system is a linear periodic system.
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