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首页> 外文会议>International Technical Meeting of the Satellite Division of The Institute of Navigation >Performance Analysis on Multi-Constellation SBAS of the Modified L1-only SBAS Message
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Performance Analysis on Multi-Constellation SBAS of the Modified L1-only SBAS Message

机译：Mut-Constellation SBA的绩效分析SBA的修改为SBAS消息

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All the current SBAS systems broadcast the augmentation message based on the L1-only SBAS MOPS (Minimum Operational Performance Standards), which is described in the RTCA DO-229 as an international standard. The L1 SBAS message was originally designed to support multi-GNSS constellations, but all the SBAS systems except for the SDCM of Russia provide GPS-only augmentation message. There are several reasons (i.e. a low data-rate) why most SBAS systems cannot support the multi-constellation GNSS. In order to overcome the limitations of the existing L1-only SBAS MOPS and to improve the performance of the current operating SBAS systems, studies on the L1/L5 DFMC (Dual-Frequency, Multi-Constellation) SBAS are actively ongoing. FAA (Federal Aviation Administration) in United States and the ESA (European Space Agency) have held the SBAS IWG (Interoperability Working Group) and have continued to discuss the development of the L1/L5 DFMC SBAS. However, even if the development of the L1/L5 DFMC SBAS is completed, many users with a L1 single frequency and multi-constellation GNSS receiver, which occupies most of the GNSS receiver market share, cannot use the L1/L5 DFMC SBAS. Therefore, it is necessary to study on a method to improve the performance of the L1-only SBAS. We propose to remove the fast corrections and to assign additional time slots for providing the long-term corrections of GLONASS and other constellations. As we had already proven at the ION ITM 2017, the PRC (Pseudo-Range Correction) in MT (Message Type) 2 to 5 needs not to be broadcast every 6 seconds, and it can be included to the satellite clock correction term in MT 25 after being converted into the unit of second. If the fast correction is not broadcast, half of the time slots are available and enough to send the long-term corrections for other constellations than GPS. And, we generated the long-term corrections for GLONASS satellites using GLONASS satellite precise ephemeris from the IAC (Information and Analysis Center). GLONASS long-term corrections were packed in MT 25 and these additional messages were scheduled in the empty time slots obtained by removing the fast correction. In this paper, we suggested to remove the fast correction and to modify the broadcasting timing and very few parameters of the current L1 SBAS message. We also showed that even this minor modification is working with the live SBAS message and effective to reduce the size of the protection level by supporting the multi-constellation GNSS, which will also contribute to improve the performance of integrity, availability and continuity.
机译：所有当前的SBAS系统基于L1-Onl SBAS MOPS（最小操作性能标准）广播增强消息，将RTCA Do-229作为国际标准描述。 L1 SBAS消息最初旨在支持多GNSS星座，但除俄罗斯SDCM之外的所有SBAS系统都提供了仅限GPS的增强消息。有几个原因（即，低数据速率）为什么大多数SBAS系统无法支持多星座GNSS。为了克服现有L1的SBAS MOP的局限性并改善当前操作SBAS系统的性能，对L1 / L5 DFMC（双频，多星座）SBA的研究是积极持续的。美国联邦航空局（联邦航空管理局）在美国和ESA（欧洲空间机构）担任SBAS IWG（互操作性工作组），并继续讨论L1 / L5 DFMC SBA的发展。但是，即使L1 / L5 DFMC SBA的开发完成，许多具有L1单频和多星座GNSS接收器的用户，占据大部分GNSS接收器市场共享，也不能使用L1 / L5 DFMC SBA。因此，有必要研究一种改进L1-SBA的性能的方法。我们建议去除快速校正，并分配额外的时隙，以提供Glonass和其他星座的长期校正。正如我们已在ION ITM 2017已经证明，中国（伪距校正）在MT（消息类型）2〜5需要不被每6秒广播，并且可以将它包含在MT中的卫星时钟校正项25转换为第二个单位后。如果不广播快速校正，则有一半的时隙可用，并且足以向其他星座发送比GPS的长期校正。并且，我们使用来自IAC（信息和分析中心）的Glonass卫星精确星历来生成Glonass卫星的长期校正。 Glonass长期校正填充在MT 25中，并在通过去除快速校正而获得的空时隙中调度这些附加消息。在本文中，我们建议删除快速校正，并修改当前L1 SBA消息的广播时序和非常少数参数。我们还表明，即使是这种小型修改也与Live SBAS消息一起使用，有效地通过支持多星座GNSS来减少保护水平的大小，这也将有助于提高完整性，可用性和连续性的性能。

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