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首页> 外文会议>4th ESA International Conference on Spacecraft Guidance, Navigation and Control Systems, 4th, Oct 18-21, 1999, ESTEC, Noordwijk, The Netherlands >FULL ATTITUDE FROM A SINGLE GPS ANTENNA: DEMONSTRATION OF CONCEPT WITH ORBITAL DATA FROM PoSAT-1
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FULL ATTITUDE FROM A SINGLE GPS ANTENNA: DEMONSTRATION OF CONCEPT WITH ORBITAL DATA FROM PoSAT-1

机译：单个GPS天线的完整姿态：PoSAT-1轨道数据的概念演示

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摘要

A Global Positioning System (GPS) receiver can provide the Carrier to Noise for the GPS signal currently being tracked, which may give the user additional attitude information. This paper describes the first results for full attitude determination from real orbital data. This method can especially be useful for small satellites, which normally do not have too high accuracy requirements for attitude and have already a single GPS antenna for positioning. For this project data was collected from the microsatellite PoSAT-1. This data is analysed to find a possible relationship between CNR and attitude. The modelling of the relationship was achieved through two methods; a look-up-table and a continuous function based on spherical harmonics. The attitude of the satellite is determinated with the use of this relationship and an Extended Kalman filter. The conclusion is that attitude determination using a single GPS antenna is feasible, and the potential accuracy can be expected to be 3 degrees for roll and pitch and 10 degrees for yaw for a gravity gradient stabilised satellite and can be improved if the proper mathematical modelling of the antenna gain pattern is applied. At this moment Surrey is also working on GPS attitude determination with multi GPS antennas onboard of satellites. Surrey's GPS receiver has demonstrated positioning in orbit, in the future also experiments with GPS attitude determination are planned.
机译：全球定位系统（GPS）接收器可以为当前正在跟踪的GPS信号提供“噪声携带者”，这可以为用户提供其他姿态信息。本文介绍了根据实际轨道数据进行全姿态确定的第一个结果。这种方法对于小型卫星尤其有用，这些小型卫星通常对姿态的精度要求不高，并且已经有一个用于定位的GPS天线。对于该项目，数据来自微卫星PoSAT-1。分析该数据以发现CNR和态度之间的可能关系。关系的建模是通过两种方法完成的；查找表和基于球谐函数的连续函数。通过使用这种关系和扩展卡尔曼滤波器，可以确定卫星的姿态。结论是，使用单个GPS天线确定姿态是可行的，对于重力梯度稳定的卫星，潜在的精度预计为横摇和俯仰为3度，偏航为10度，并且如果对卫星进行适当的数学建模，则可以提高精度。天线增益模式被应用。目前，萨里还正在使用卫星上的多个GPS天线进行GPS姿态确定。萨里（Surrey）的GPS接收器已经证明了其在轨道上的定位，将来还将计划进行GPS姿态确定的实验。

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