Incremental benefits of dual frequency signals for the Wide Area Augmentation System
Incremental benefits of dual frequency signals for the Wide Area Augmentation System
复制标题
双频信号为广域增强系统带来的增量优势
DOI：
10.1109/plans.2010.5507217
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
S. Peck
中科院分区：
文献类型：
--
作者：
T. Schempp;S. Peck
基于卫星的增强系统（SBAS）已经在美国、欧洲和日本实施，印度也即将部署一个。如今，SBAS系统利用双频L1-CA/L2半编码测量，为飞机提供精确的校正和完整性界限，用于航路和精确进近操作。与地面系统相比，由于L2频率不在受保护的航空无线电导航服务（ARNS）频段内，因此飞机仅限于使用L1-CA测量。在SBAS位置解中最大的误差来源和系统性能的限制因素是电离层修正。使用两个频率，地面系统能够对电离层延迟产生修正，尽管与这些修正相关的不确定性界限必须膨胀，以解释电离层风暴的不可预测影响。随着IIF和III块GPS卫星中L5信号的增加，航空接收机将能够在没有SBAS校正的情况下校正电离层延迟，从而大大提高了精确接近操作的可用性。尽管在最终状态下已经显示出明显的好处，但完整的L5级GPS卫星星座要到2018年才能建成。本文量化了利用GPS IIF和GPS III卫星部分星座L5信号的可用性和连续性效益。
Satellite Based Augmentation Systems (SBAS) have been implemented in the United States, Europe, and Japan and one is soon to be deployed in India as well. Today, SBAS systems utilize dual frequency L1-CA/L2 semi-codeless measurements to provide precise corrections and integrity bounds to aircraft for use in both enroute and precision approach operations. In contrast to the ground system, the aircraft are limited to the sole use of L1-CA measurements since the L2 frequency does not lie in a protected Aeronautical Radio Navigation Service (ARNS) frequency band. The single biggest source of error in an SBAS position solution and the limiting factor in system performance is the ionospheric corrections. Using two frequencies, the ground system is capable of creating corrections for ionospheric delays although the uncertainty bounds associated with these corrections must be inflated to account for the unpredictable effects of ionospheric storms. With the addition of the L5 signal in block IIF and block III GPS satellites, aviation receivers will be able to correct for ionospheric delay without SBAS corrections drastically improving availability of precision approach operations. Although clear benefits have been shown in the end state, a full constellation of L5 capable GPS satellites will not be available until 2018. This paper quantifies the availability and continuity benefits of utilizing the L5 signal from a partial constellation of GPS IIF and GPS III satellites.