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首页> 外文期刊>Intelligent Transportation Systems, IEEE Transactions on >Future Dual-Frequency GPS Navigation System for Intelligent Air Transportation Under Strong Ionospheric Scintillation
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Future Dual-Frequency GPS Navigation System for Intelligent Air Transportation Under Strong Ionospheric Scintillation

机译：强电离层闪烁下未来智能航空运输的双频GPS导航系统

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摘要

GPS technology is essential for future intelligent air transportation systems such as the Next Generation Air Transportation System (NextGen) of the United States. However, observed deep and frequent amplitude fading of GPS signals due to ionospheric scintillation can be a major concern in expanding GPS-guided aviation to the equatorial area where strong scintillation is expected. Current civil GPS airborne avionics track signals at a single frequency (L1 frequency) alone because it was the only civil signal available in the frequency band for aviation applications. The first GPS Block IIF satellite was launched in May 2010. This next-generation satellite transmits a new civil signal at the L5 frequency, which can be used for air transportation. This paper investigates a possible improvement in the availability of GPS-based aircraft landing guidance down to 200 ft above the runway, which is also known as Localizer Performance with Vertical Guidance (LPV) 200, under strong ionospheric scintillation when dual-frequency signals are available. Based on the availability study, this paper proposes and justifies a GPS aviation receiver performance standard mandating fast reacquisition after a very brief signal outage due to scintillation. In order to support a temporary single-frequency operation under a single-frequency loss due to scintillation, a new vertical protection level (VPL) equation is proposed and justified. With this new performance requirement and new VPL equation in place, 99% availability of LPV-200 would be attainable, rather than 50% at the current standards, even under the severe scintillation scenarios considered in this paper.
机译：GPS技术对于诸如美国的下一代航空运输系统（NextGen）之类的未来智能航空运输系统至关重要。然而，由于电离层闪烁而引起的GPS信号深而频繁的振幅衰减，可能是将GPS制导的航空扩展到预计强烈闪烁的赤道地区的一个主要问题。当前的民用GPS机载航空电子设备仅在单个频率（L1频率）上跟踪信号，因为它是该频段在航空应用中唯一可用的民用信号。首颗GPS Block IIF卫星于2010年5月发射。这颗下一代卫星以L5频率发射新的民用信号，可用于航空运输。本文研究了在双频信号可用时，在强电离层闪烁下，基于GPS的飞机降落制导的可用性可能会有所改善，该降落制导可降落到跑道上方200英尺处，这也称为具有垂直制导（LPV）200的定位器性能。 。在可用性研究的基础上，本文提出并证明了GPS航空接收器性能标准，该标准要求在由于闪烁而造成的短暂信号中断后要求快速重新采集。为了在由于闪烁引起的单频损耗下支持临时的单频运行，提出了一个新的垂直保护电平（VPL）公式并证明了其合理性。有了这个新的性能要求和新的VPL公式，即使在本文考虑的严重闪烁情况下，LPV-200的可用性也将达到99％，而不是当前标准的50％。

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