Evaluation of precise point positioning using MADOCA-LEX via Quasi-Zenith satellite system
Evaluation of precise point positioning using MADOCA-LEX via Quasi-Zenith satellite system
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发表时间：
2014-01
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通讯作者：
Taro Suzuki;N. Kubo;T. Takasu
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作者：
Taro Suzuki;N. Kubo;T. Takasu
本文介绍了准天顶卫星系统（QZSS） l波段实验（LEX）信号对精确点定位（PPP）的评价。第一颗QZSS，日本区域卫星导航系统，于2010年9月从日本发射。QZSS传输增强信号，以提高全球导航卫星系统（GNSS）的定位精度。其中一种QZSS增强信号是LEX信号，其目标是利用其广播数据实现厘米级定位。2013年4月，日本宇宙航空研究开发机构开始了新型LEX报文MADOCA-LEX报文的测试传输。MADOCA-LEX采用状态空间表示（SSR）格式提供多gnss卫星轨道和时钟校正数据，用于实时PPP。不幸的是，使用目前可用的商用GNSS接收器无法接收LEX信号。此外，对于实时应用，需要提取LEX信号中包含的LEX消息，以便实时计算用户位置。在本研究中，我们开发了一种使用软件GNSS接收器接收和解码MADOCA-LEX消息的新技术。我们已经开发了一种技术来解码LEX消息，而不使用LEX信号跟踪环路来估计LEX信号的码相位和多普勒频率，然而，借助传统的L1CA信号同时从QZSS广播。通过静力和运动试验验证了所提方法的有效性。在实时静态测试中，我们利用PPP和MADOCA-LEX报文确定了距离均方根误差在10 cm以内的接收器位置。通过露天环境下的运动测试，我们还发现所提出的定位技术对于分米级精度的位置估计是有效的。
This paper describes the evaluation of precise point positioning (PPP) using the Quasi-Zenith Satellite System (QZSS) L-band Experiment (LEX) signal. The first QZSS, the Japanese regional satellite navigation system, was launched from Japan in September 2010. QZSS transmits augmentation signals to enhance the global navigation satellite system (GNSS) positioning accuracy. One of the QZSS augmentation signals is the LEX signal, the objective of which to realize centimeter-class positioning with its broadcasting data. The Japan Aerospace Exploration Agency began a test transmission of a MADOCA-LEX message, a new type of LEX message, in April 2013. MADOCA-LEX provides the satellite orbit and clock correction data of multi-GNSS using a statespace representation (SSR) format for real-time PPP. Unfortunately, the LEX signal cannot be received using the currently available commercial GNSS receivers. Moreover, for real-time applications, the LEX message contained in the LEX signal is required to be extracted for computing the user positions in real time. In this study, we have developed a novel technique for receiving and decoding the MADOCA-LEX message using a software GNSS receiver. We have developed a technique to decode the LEX messages without the use of an LEX signal tracking loop for estimating the code phase and the Doppler frequency of the LEX signal, however, with the aid of the conventional L1CA signal broadcasted simultaneously from the QZSS. We have confirmed the effectiveness of the proposed method through static and kinematic tests. We have determined the receiver positions with a distance rootmean-square error of within 10 cm, by using PPP with the MADOCA-LEX message in the real-time static test. We have also found that the proposed localization technique is effective for position estimation with the decimeterlevel accuracy through a kinematic test in the open-sky environment.