| 自适应滤波在LEO星载GPS实时定轨中的应用 |
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| 引用本文： | 秦显平,杨元喜.自适应滤波在LEO星载GPS实时定轨中的应用[J].测绘学院学报,2009(4). |
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| 作者姓名： | 秦显平 杨元喜 |
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| 作者单位： | 信息工程大学测绘学院;西安测绘研究所; |
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| 基金项目： | 国家自然科学基金资助项目(4047400140604003) |
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| 摘 要： | 针对低轨卫星LEO星载GPS实时定轨中存在的问题,提出了以单点定位结果为观测值,采用自适应卡尔曼滤波(AKF)方法进行动力平滑来实现LEO星载GPS实时动力法定轨。采用2004-03-29~31日的GRACE-A卫星实测数据进行了实时定轨计算,并分析了自适应因子、噪声补偿方差、GPS信号中断对自适应定轨的影响。通过计算分析发现,采用AKF进行LEO星载GPS实时定轨可有效解决采用EKF噪声补偿方差难以确定的难题。同时还发现,采用AKF进行LEO星载GPS实时定轨具有较强的稳定性。
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| 关 键 词： | 扩展卡尔曼滤波 自适应滤波 实时定轨 全球定位系统 低轨卫星 动力平滑 |
Applications of Adaptive Filtering on Real Time Orbit Determination of LEO Satellites Based on GPS |
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| QIN Xian-ping,YANG Yuan-xi.Applications of Adaptive Filtering on Real Time Orbit Determination of LEO Satellites Based on GPS[J].Journal of Institute of Surveying and Mapping,2009(4). |
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| Authors: | QIN Xian-ping YANG Yuan-xi |
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| Institution: | 1.Institute of Surveying and Mapping;Information Engineering University;Zhengzhou 450052;China;2.Xi'an Research Institute of Surveying and Mapping;Xi'an 710054;China |
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| Abstract: | To solve the problem of real time orbit determination of LEO satellites based on GPS,the method of dynamic orbit smoothing was put forward using adaptive Kalman filtering(AKF),which taking positioning solutions as observation.The real time of GRACE-A satellite orbit was computed by using the GPS data observed from March 29 to 31,2004.The influence of the adaptive factor,the variance matrix of model noise and the signal of GPS break-off in AKF orbit determination were analyzed.With comparison and analysis,th... |
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