万晓云, 吴云龙, 郭恒洋, 李明. 基于重力场产品的水下匹配导航发展现状及影响因素分析[J]. 武汉大学学报 ( 信息科学版), 2023, 48(6): 879-890. DOI: 10.13203/j.whugis20220568
引用本文: 万晓云, 吴云龙, 郭恒洋, 李明. 基于重力场产品的水下匹配导航发展现状及影响因素分析[J]. 武汉大学学报 ( 信息科学版), 2023, 48(6): 879-890. DOI: 10.13203/j.whugis20220568
WAN Xiaoyun, WU Yunlong, GUO Hengyang, LI Ming. Development Status and Influencing Factor Analysis of Underwater Matching Navigation Based on Gravity Field Products[J]. Geomatics and Information Science of Wuhan University, 2023, 48(6): 879-890. DOI: 10.13203/j.whugis20220568
Citation: WAN Xiaoyun, WU Yunlong, GUO Hengyang, LI Ming. Development Status and Influencing Factor Analysis of Underwater Matching Navigation Based on Gravity Field Products[J]. Geomatics and Information Science of Wuhan University, 2023, 48(6): 879-890. DOI: 10.13203/j.whugis20220568

基于重力场产品的水下匹配导航发展现状及影响因素分析

Development Status and Influencing Factor Analysis of Underwater Matching Navigation Based on Gravity Field Products

  • 摘要: 因高精度、无源性的特点,水下匹配导航技术已成为水下运载体导航的主要发展方向之一。分析水下匹配导航存在的问题,详细介绍了基于重力场产品的匹配导航发展现状,并对制约该技术定位精度的因素进行了分析。通过对比中国南海和太平洋研究区的重力异常、水深以及重力梯度特征参数,验证了重力辅助匹配导航技术更适合在重力特征变化明显的区域使用;当重力场产品格网大小为l时,匹配导航的最高精度为 \frac\sqrt6l6 。

     

    Abstract: Due to the characteristics of high accuracy and passivity, underwater matching navigation technology has become one of the main development directions of underwater vehicle navigation. To analyze the problems in gravity matching navigation, this paper introduces the development status of matching na-vigation based on gravity field products, and then discusses the constraints for positioning accuracy, including matching variables, gravity measurement precision, suitable matching areas and grid size. Gravity anomaly and gravity gradients of the two study regions are calculated by the spherical harmonic function based on a highly accurate gravity field model. And the influence of the grid size and the accuracy of gravity field pro-duct on the matching algorithm is evaluated. According to different kinds of indexes on gravity field characteristics in the two study regions, it is easy to find that the study region of the South China Sea has much more abundant gravity field information and is more suitable for matching navigation than the Pacific Ocean. The gravity assisted matching navigation techno-logy is more suitable for use in the areas with obvious va-riations in gravity characteristics. If the grid size of the gravity field products is l, the highest precision of the matching navigation is \frac\sqrt6l6 .

     

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