| 自主导航星上快速星历拟合算法研究 |
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| 引用本文： | 毛悦,宋小勇,胡小工,何峰.自主导航星上快速星历拟合算法研究[J].测绘科学,2017,42(8). |
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| 作者姓名： | 毛悦 宋小勇 胡小工 何峰 |
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| 作者单位： | 1. 地理信息工程国家重点实验室,西安710054;西安测绘研究所,西安710054;中国科学院上海天文台,上海200030;2. 地理信息工程国家重点实验室,西安710054;西安测绘研究所,西安710054;3. 中国科学院上海天文台,上海,200030;4. 北京卫星导航中心,北京,100094 |
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| 摘 要： | 针对北斗卫星导航系统地面监测站布设范围有限,系统抗打击能力不足等问题,我国已计划实现卫星自主导航。通过地面演示验证发现,星上自主定轨与时间同步软件同星上广播星历拟合软件耗费同等的机时。该文的研究目标为在保证精度的前提下,降低星上自主星历拟合的计算量。通过试验分析表明,采用直接降低星历参数个数的方法,会损失精度,效果不佳。利用自主导航自身特点,以长期预报星历为基础,通过参数固定,可在保证精度的基础上使矩阵求逆运算量降低近6倍。以长期预报星历为初值,可有效降低迭代次数,使计算量下降近5倍。
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| 关 键 词： | 北斗卫星导航系统 广播星历 自主导航 计算量 |
Research on on-board broadcast ephemeris fast fitting algorithm used on autonomous navigation satellite |
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| MAO Yue,SONG Xiaoyong,HU Xiaogong,HE Feng.Research on on-board broadcast ephemeris fast fitting algorithm used on autonomous navigation satellite[J].Science of Surveying and Mapping,2017,42(8). |
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| Authors: | MAO Yue SONG Xiaoyong HU Xiaogong HE Feng |
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| Abstract: | Aiming at the problem that ground monitoring station of BD2 navigation system is limited in scope,and the anti-attack capacity of BD2 is not sufficient enough.In order to make up for the BD2 navigation system of these problems,China has planned to achieve autonomous navigation for satellites.Through the ground demonstration,it was found that the satellite broadcast ephemeris fitting software costed the same calculation time with the on-board autonomous orbit determination and time synchronization software.The research objective of this paper is to reduce the calculation amount of on-board ephemeris fitting,but not to decrease the ephemeris accuracy.Through test and analysis,it was found that using the method of directly reducing the number of ephemeris parameters would loss of the accuracy.The effect is not good enough.Autonomous navigation system has the long-term broadcast ephemeris,which is its own characteristic.Using long-term broadcast ephemeris parameter substitution method could keep the fitting precision and make the calculation amount of inversing matrix reduced by nearly 6 times.Using the long-term broadcast ephemeris as initial value could effectively reduce the number of iterations,and make the calculation amount decreased by nearly 5 times. |
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| Keywords: | BeiDou satellite navigation system broadcast ephemeris autonomous navigation calculation amount |
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