| 引用本文: | 王旭,罗兵,练军想,等.尾数细分计数逻辑对捷联惯导系统姿态误差的影响.[J].国防科技大学学报,2011,33(3):169-174.[点击复制] |
| WANG Xu,LUO Bing,LIAN Junxiang,et al.Mantissa Subdivision Method Influence on the Accuracy of the Strapdown Inertial Navigation System[J].Journal of National University of Defense Technology,2011,33(3):169-174[点击复制] |
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| 尾数细分计数逻辑对捷联惯导系统姿态误差的影响 |
| 王旭, 罗兵, 练军想, 李万里 |
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(国防科技大学 机电工程与自动化学院，湖南 长沙 410073)
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| 摘要: |
| 为了提高激光陀螺的检测分辨率，采用了尾数细分计数逻辑新方法，并分析了此方法对捷联惯导系统姿态误差的影响。首先分析了常规四倍频细分计数逻辑的原理与特点，得出其分辨率约为1/4周期的结论；然后对比分析了基于常规四倍频的尾数细分计数逻辑的原理、实现方法及其特点，分析与试验表明，此方法能够进一步大幅度提高检测分辨率。基于以上结论，利用Simulink仿真对比分析了两种细分计数方法结果对姿态解算误差的影响，仿真结果表明，采用尾数细分计数逻辑相对于采用常规四倍频细分计数逻辑，可以在一定程度上改善导航精度，因此尾数细分计数逻辑对高精度的导航系统具有实际的理论与工程应用价值。 |
| 关键词: 尾数细分计数逻辑 导航解算 姿态误差 四倍频细分 激光陀螺 |
| DOI： |
| 投稿日期：2010-09-27 |
| 基金项目:国家863高技术资助项目(2006AA06A202) |
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| Mantissa Subdivision Method Influence on the Accuracy of the Strapdown Inertial Navigation System |
| WANG Xu, LUO Bing, LIAN Junxiang, LI Wanli |
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(College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In order to improve measurement resolution of RLG(Ring laser gyroscope), the mantissa subdivision method was used and its influence on the accuracy of the strapdown inertial navigation system was analyzed. Firstly, the analysis of the traditional four sub-frequency subdivision method shows that its measurement resolution is a quarter period. Secondly, the principle, realization and characteristics of the mantissa subdivision method which is based on four sub-frequency subdivision method were contrastively analyzed. It drew a conclusion that the new method can obviously improve the measurement resolution of RLG. Based on the conclusion above, influences on the accuracy of the strapdown inertial navigation system of the two methods are analyzed by Simulink. The simulation indicates that the mantissa subdivision method can improve the navigation accuracy comparing with the traditional four sub-frequency subdivision method. Therefore, the mantissa subdivision method is meaningful to both theoretic study and engineering applications of high precision navigation system. |
| Keywords: mantissa subdivision method navigation computation attitude error four sub-frequency subdivision method ring laser gyroscope |
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