| 北斗软件接收机中GEO卫星定位策略 |
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| 引用本文： | 孟骞,曾庆化,刘建业,冯绍军.北斗软件接收机中GEO卫星定位策略[J].中国惯性技术学报,2016(3):349-354. |
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| 作者姓名： | 孟骞 曾庆化 刘建业 冯绍军 |
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| 作者单位： | 1. 南京航空航天大学导航研究中心，南京 210016; 卫星通信与导航协同创新中心，南京 210016;2. 帝国理工学院交通研究中心，英国伦敦 SW7 2AZ |
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| 基金项目： | 国家自然科学基金(61533008，61374115，61328301)；中央高校基本科研业务费专项资金(NS2015037)；国家留学基金 |
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| 摘 要： | GEO卫星在导航系统中发挥着基本导航、增强和转发等三大功能。针对北斗系统GEO卫星的特殊性和兼容性,对北斗GEO卫星播发的D2导航电文的特点进行了分析,利用GEO的静地特性在基带信号处理中应用数学思想提出了基于二次函数逼近的快速牵引,推导了GEO卫星位置速度的计算公式,提出了基于模糊控制的GEO伪距测量算法,提高了信号处理通道的通用性和兼容性。对相关算法和策略在基于DSP+FPGA的软件接收机中利用实际信号进行了验证,在省略精捕获时间的情况下实现了50 Hz以下的多普勒频移精度,伪距测量方法的通用性节省了50%的资源和工作量,相关算法具有良好的实用价值。
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| 关 键 词： | 静止轨道卫星 二次函数逼近 软件接收机 模糊控制 |
Positioning strategy of GEO satellite in BeiDou software-defined receiver |
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| Abstract: | GEO satellites play the roles of basic navigation, enhancement and forwarding in GNSS. In this paper, the specialty and compatibility of BeiDou GEO positioning are studied. The D2 navigation data in BeiDou system are analyzed. The quadratic function approximation in base-band signal process is proposed, and GEO position and velocity computational formulas are derived. A GEO pseudorange corrected algorithm based on fuzzy control is designed which improved the versatility and compatibility of the signal processing channel. Corresponding algorithms and strategy are successfully tested and verified by using actual BeiDou B1I signal based on DSP+FPGA software-defined receiver, which realize the Doppler shift accuracy of <50Hz without the fine acquisition, and reduce the workload of pseudorange measurement by 50%. The above methods have favorable application value. |
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| Keywords: | geostationary orbit quadratic function approximation software-defined receiver fuzzy control |
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