全球定位系统退化环境下的机载伪卫星

H. Oktay, M. Stepaniak
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引用次数: 3

摘要

全球定位系统(GPS)是一种连续的全天候导航服务,为授权的军事用户提供精确导航。与所有卫星导航系统一样,GPS要求用户保持对四颗或更多卫星的直接视线访问,因此当天空视野受阻时,性能会下降或被拒绝。为了尽量减少这个问题,已经开发和测试了各种类型的增强。伪卫星,也称为伪卫星,是一种这样的增强系统,其中来自附加发射机的类似gps的测距信号补充了卫星信号。本文研究了机载伪卫星在城市环境中支持精确定位的能力。研究了各种城市地形区由于障碍物而限制卫星可用性的影响。然后研究了伪卫星提高可用性和准确性的能力。在不同的定位场景下,比较了仅依赖GPS和使用机载伪卫星时的系统性能。仿真结果表明,适当配置机载伪卫星可以获得所需的精度和可用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Airborne pseudolites in a Global Positioning System degraded environment
The Global Positioning System (GPS) is a continuous, all-weather navigation service that supports precise navigation for authorized military users. As with all satellite navigation systems, GPS is requires the user to maintain direct line-of-sight access to four or more satellites, and therefore performance is degraded or denied when the sky view is obstructed. To minimize this problem, various types of augmentations have been developed and tested. Pseudo-satellites, also called pseudolites, are one such augmentation system in which GPS-like ranging signals from additional transmitters supplement the satellite signals. This paper examines the ability of airborne pseudolites to support precise positioning in an urban environment. The impact of restricted satellite availability due to obstructions is examined for various urban terrain zones. Then the ability of the pseudolite to improve both availability and accuracy is investigated. A comparison of the system performance when relying on GPS only and when using an airborne pseudolite is presented for various positioning scenarios. Simulation results show that required accuracy and availability can be obtained by using an appropriately equipped airborne pseudolite.
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