• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Saint Petersburg International Conference on Integrated Navigation Systems; 20040524-26; Saint Petersburg(RU) >CAN LORAN MEET GPS BACKUP REQUIREMENTS?
【24h】

CAN LORAN MEET GPS BACKUP REQUIREMENTS?

机译：LORAN可以满足GPS备份要求吗？

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Federal Aviation Administration (FAA) is currently leading a team consisting of members from Industry, Government, and Academia to provide guidance to the policy makers in their evaluation of the future of Loran-C in the United States. In a recently completed Navigation Transition Study, the FAA concluded that Loran-C, as an independent radionavigation (RNAV) system, is theoretically the best backup for the Global Positioning System (GPS). However, in order for Loran-C to be considered a viable back-up system to GPS, it must be able to meet the requirements for non-precision approaches (NPA 's) for the aviation community, and the Harbor Entrance and Approach (HEA) requirements for the maritime community. Through FAA sponsoring, the U.S. Coast Guard Academy (USCGA) is responsible for conducting some of the tests and evaluations to help determine whether Loran can provide the accuracy, availability, integrity, and continuity to meet these requirements. A major part of assessing the suitability of Loran is in understanding the nature of Loran ground wave propagation over paths of varying conductivities and terrain. Propagation time adjustments, called "additional secondary factors (ASFs)," are used to adjust receiver times of arrival (TOAs) to account for propagation over non-seawater path(s). These ASFs vary both spatially and temporally, and unless understood and/or modeled, we lose accuracy and may not be able to guarantee a hazardously misleading information (HMI) probability of less than 1x10~(-7). During the summer of 2003, the Coast Guard Academy, with flight support from the FAA Technical Center, conducted a series of tests to measure ASF variations in the vicinity of several selected airfields in Colorado, Arkansas, Florida, and California. In addition, approaches were flown at several airports in each of these areas. ASF and TOA data collected during these trials has been analyzed through post-processing to determine the Loran position accuracy during approaches. The accuracy of raw (uncorrected Loran), as well as ASF-corrected Loran positions are shown for a variety of ASF profiles. Using the BALOR ASF modeling software produced by the University of Wales at Bangor, we have also done some simulations of best-case performance analysis for receivers with little or no noise. In addition, we present some ideas for using a Kalman-filtered integrated Loran-INS receiver in order to smooth out Loran position errors. Finally, how all of these efforts lead towards meeting the accuracy requirements is shown.
机译：美国联邦航空管理局（FAA）目前正在领导一个由行业，政府和学术界成员组成的团队，为决策者在评估美国Loran-C的未来时提供指导。在最近完成的导航过渡研究中，FAA得出结论，从理论上讲，Loran-C作为独立的无线电导航（RNAV）系统，是全球定位系统（GPS）的最佳备用。但是，为了将Loran-C视为可行的GPS备用系统，它必须能够满足航空界对非精密进近（NPA）的要求，以及海港出入口进近（ HEA）对海事界的要求。通过FAA的赞助，美国海岸警卫队学院（USCGA）负责进行一些测试和评估，以帮助确定Loran是否可以提供准确性，可用性，完整性和连续性以满足这些要求。评估Loran的适用性的主要部分是了解Loran地波在不同电导率和地形的路径上传播的本质。传播时间调整被称为“其他次级因子（ASF）”，用于调整接收器的到达时间（TOA），以说明在非海水路径上的传播。这些ASF随时间和空间变化，除非理解和/或建模，否则我们将失去准确性，并且可能无法保证危险误导性信息（HMI）的概率小于1x10〜（-7）。在2003年夏季，海岸警卫学院在FAA技术中心的飞行支持下，进行了一系列测试，以测量科罗拉多州，阿肯色州，佛罗里达州和加利福尼亚州几个选定机场附近的ASF变化。此外，在这些区域中的每个区域的几个机场都有进场航班。在这些试验期间收集的ASF和TOA数据已通过后处理进行了分析，以确定进近期间的罗兰位置精度。针对各种ASF配置文件，显示了原始（未校正的Loran）以及ASF校正的Loran位置的准确性。使用由威尔士大学班戈分校生产的BALOR ASF建模软件，我们还对无噪音或无噪音的接收机进行了最佳情况性能分析的一些模拟。另外，我们提出了一些使用卡尔曼滤波的集成Loran-INS接收器的想法，以消除Loran位置误差。最后，显示了所有这些努力如何导致满足精度要求。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号