| 影响重力场匹配导航效果的要素分析 |
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| 引用本文： | 吴太旗,黄谟涛,边少锋.影响重力场匹配导航效果的要素分析[J].海洋测绘,2010(Z1):25-29. |
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| 作者姓名： | 吴太旗 黄谟涛 边少锋 |
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| 作者单位： | 海军海洋测绘研究所,天津 300061 ；海军工程大学 导航工程系,湖北 武汉 430033 |
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| 摘 要： | 从重力场匹配导航的改进 TERCOM 算法入手,针对采样长度、采样间隔以及重力测量误差对匹配结果的影响进行了系统的分析,并在此基础上设计了客观有效的准实时仿真试验,结果表明:(1)采样长度对匹配结果有重要的影响,匹配长度过短或过长都不利于匹配到最佳格网位置,当采样长度与重力基准图的分辨率比值在 10 ~ 20 之间时,能够获得较好的匹配效果;(2)在采样长度一定的情况下,适当增加采样间隔可以在一定程度上提高匹配的整体精度;但采样间隔增加到一定程度后,继续增加采样间隔将引起匹配效果急剧恶化;(3)重力测量白噪声误差对匹配结果影响相对较大,但 5mGal 以内的重力测量白噪声对都能够进行有效匹配;而在重力测量误差受高斯白噪声和系统性误差同时作用的情况下,过大的系统性误差将不能得到有效匹配。
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| 关 键 词： | 无源导航 水下导航 重力场匹配 影响要素 改进 TERCOM 算法 |
Analysis of Several Essential Factors Which Affect Gravity Aided Navigation |
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| WU Tai-qi,HUANG Mo-tao,BIAN Shao-feng.Analysis of Several Essential Factors Which Affect Gravity Aided Navigation[J].Hydrographic Surveying and Charting,2010(Z1):25-29. |
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| Authors: | WU Tai-qi HUANG Mo-tao BIAN Shao-feng |
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| Abstract: | The effect of the Sampling Length, sampling interval and gravity measurement error to the gravity aided navigation is analyzed systematically based on modified TERCOM arithmetic. Simulation of similar real time shows some conclusion as follows: (1) The sampling length has much influence to the matching result,too long or too short can either match to the optical grid point. Experiments show that the matching result is very well when the ratio of sampling length to the base map resolution is between 10 and 20; (2) Increasing the sampling interval can improve the matching precision when sampling length is fixed. However the result gets worse sharply when the sampling interval added up to a certain extent. (3) The white noise error of gravity measurement effect much to the matching,but it still can be matched even the noise is up to 5 mGal. When the gravity measurement error includes both gauss white noise and systematic error,Too large systematic error leads to invalid matching. |
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