Abstract The next-generation of satellite-based augmentation system (SBAS) will employ a dual-frequency multi-constellation (DFMC) service providing several advantages over the classical SBAS L1 service. In September 2017, a two-year SBAS test-bed was initiated by Australia and New Zealand in preparation for building an operational system. This system includes DFMC SBAS in addition to the legacy SBAS L1 service and real-time precise point positioning (PPP) service over the Asia-Pacific region. In this paper, we focus on the new DFMC SBAS, and first discuss its positioning and integrity monitoring (IM) algorithms. Next, its performance is tested and analyzed using real DFMC SBAS data, restricting focus to LPV-200 in aviation. Based on real SBAS messages from the geostationary (GEO) satellite Inmarsat-4F1, testing was performed first at two known stations with actual GNSS observations, and next at simulated grids covering the entire Asia-Pacific region. A sensitivity analysis is performed, investigating the contribution of the error sources and the impact of changing the satellite mask angle. Experimental results of 12 consecutive days from September 14 to 25, 2018 of the new SBAS products show that the dual-frequency correction (DFC) residual errors have the dominant contribution in the values of the protection levels needed in IM, whereas other error sources such as the airborne receiver errors, the tropospheric and the ionosphere residual errors have secondary impacts. The accuracy of the positions was found to be at the sub-meter to meter level and was always bounded by the protection levels (PLs) at the known stations. The simulated PLs were less than the alert limit of LPV-200 during the test period in most of the areas of interest, indicating the availability of IM using DFMC SBAS in the main areas of the Asia-pacific region.

中文翻译：

---

澳大利亚和亚太地区原型 DFMC SBAS 服务的初步性能分析

摘要 下一代星基增强系统 (SBAS) 将采用双频多星座 (DFMC) 服务，与传统的 SBAS L1 服务相比具有多项优势。2017年9月，澳大利亚和新西兰启动了为期两年的SBAS试验台，为构建操作系统做准备。该系统除了传统的 SBAS L1 服务和亚太地区的实时精确点定位 (PPP) 服务外，还包括 DFMC SBAS。在本文中，我们专注于新的 DFMC SBAS，并首先讨论其定位和完整性监控 (IM) 算法。接下来，使用真实的 DFMC SBAS 数据对其性能进行测试和分析，将重点限制在航空领域的 LPV-200。基于来自地球静止 (GEO) 卫星 Inmarsat-4F1 的真实 SBAS 消息，测试首先在两个具有实际 GNSS 观测的已知站点进行，然后在覆盖整个亚太地区的模拟网格中进行。执行灵敏度分析，调查误差源的贡献和改变卫星掩模角度的影响。2018 年 9 月 14 日至 25 日 SBAS 新产品连续 12 天的实验结果表明，双频校正 (DFC) 残差在 IM 所需的保护级别值中占主导地位，而其他误差源如作为机载接收机误差，对流层和电离层残余误差具有次要影响。发现位置的精度在亚米级到米级，并且始终受已知站的保护级别 (PL) 的限制。