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  1. Article

    Open Access

    Recent Progress in Atmospheric Chemistry Research in China: Establishing a Theoretical Framework for the “Air Pollution Complex”

    Atmospheric chemistry research has been growing rapidly in China in the last 25 years since the concept of the “air pollution complex” was first proposed by Professor **aoyan TANG in 1997. For papers published...

    Tong Zhu, Ming** Tang, Meng Gao, **nhui Bi, Junji Cao… in Advances in Atmospheric Sciences (2023)

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  2. No Access

    Article

    An efficient pixel shader-based ray-tracing method for correcting GNSS non-line-of-sight error with large-scale surfaces

    Ray-tracing methods have been developed to effectively correct the global navigation satellite system (GNSS) non-line-of-sight (NLOS) errors in urban environments to increase the satellite geometry and positio...

    Zhitao Lyu, Yang Gao in GPS Solutions (2023)

  3. No Access

    Article

    Solution separation-based integrity monitoring for RTK positioning with faulty ambiguity detection and protection level

    Due to the multipath and signal shading effects, there exist biases in the carrier phase measurements, which degrades the reliability of ambiguity resolution in real-time kinematic (RTK) positioning and, subse...

    Yuting Gao, Yang Jiang, Yang Gao, Guanwen Huang, Zhe Yue in GPS Solutions (2023)

  4. No Access

    Article

    Robust unambiguous ranging technique for BDS-3 B1 wideband composite signals

    During the evolution of global navigation satellite systems (GNSS), many new GNSS signals have been proposed to meet the demand of various applications for high-precision positioning. The single-sideband compl...

    Yunhan Qi, Zheng Yao, Yang Gao, Mingquan Lu in GPS Solutions (2022)

  5. No Access

    Article

    Non-consecutive GNSS signal tracking-based ultra-tight integration system of GNSS/INS for smart devices

    Consecutively tracking the global navigation satellite system (GNSS) signal can cause power and computation difficulties to a smart GNSS device with small battery capacity and weak computation capability. We p...

    Baoyu Liu, Yang Gao, Yuting Gao, Kaixiang Tong, Mouyan Wu in GPS Solutions (2022)

  6. No Access

    Article

    HPL calculation improvement for Chi-squared residual-based ARAIM

    To obtain the tightest possible horizontal protection level (HPL) for the Chi-squared residual-based advanced receiver autonomous integrity monitoring (ARAIM), it is prerequisite to determine the worst horizon...

    Baoyu Liu, Yang Gao, Yuting Gao, Shizhuang Wang in GPS Solutions (2022)

  7. No Access

    Article

    Enhanced fault detection and exclusion based on Kalman filter with colored measurement noise and application to RTK

    With the development of high-precision safety–critical applications using global navigation satellite systems (GNSS), fault detection and exclusion (FDE) is indispensable to guaranteeing the integrity of a GNS...

    Yuting Gao, Yang Gao, Baoyu Liu, Yang Jiang in GPS Solutions (2021)

  8. No Access

    Article

    A linear Kalman filter-based integrity monitoring considering colored measurement noise

    Apart from positioning accuracy, the reliability of a navigation system is also significant, especially for safety–critical applications, such as intelligent vehicle navigation. Generally, the Global Navigatio...

    Yuting Gao, Yang Jiang, Yang Gao, Guanwen Huang in GPS Solutions (2021)

  9. No Access

    Article

    Understanding long-term variations in GPS differential code biases

    Precise estimation of satellite differential code biases (DCBs) plays a crucial role in precise ionospheric modeling, positioning, and timing. Due to the rank deficiency, a constraint or a datum is required in...

    Yan **ang, Zhexin Xu, Yang Gao, Wenxian Yu in GPS Solutions (2020)

  10. No Access

    Article

    A BDS-3 B1C/B2a dual-frequency joint tracking architecture based on adaptive Kalman filter and extended integration time

    With the development of the third-generation BeiDou navigation satellite system (BDS-3), the availability of new civil B1C and B2a signals along with existing B1I and B3I signals will greatly benefit the desig...

    Mouyan Wu, Lin Zhao, Jicheng Ding, Yang Gao, Yafeng Li, Yingyao Kang in GPS Solutions (2020)

  11. No Access

    Article

    Real-time precise point positioning with a low-cost dual-frequency GNSS device

    In recent years, there is an increasing demand for precise positioning with low-cost GNSS devices in support of applications from self-driving cars to unmanned aerial vehicles. Although single-frequency GNSS d...

    Zhixi Nie, Fei Liu, Yang Gao in GPS Solutions (2019)

  12. No Access

    Article

    Estimation and representation of regional atmospheric corrections for augmenting real-time single-frequency PPP

    Real-time single-frequency precise point positioning (PPP) can be significantly augmented by applying high-quality atmospheric corrections. In previous work, the satellite-and-station-specific slant total elec...

    Peiyuan Zhou, ** Wang, Zhixi Nie, Yang Gao in GPS Solutions (2019)

  13. No Access

    Article

    Pivot single-difference ambiguity resolution for multi-GNSS positioning with non-overlap** frequencies

    Ambiguity resolution in real-time kinematic (RTK) positioning is increasingly dependent on the combination of multi-GNSS observations, especially in challenging signal environments such as urban canyon areas. ...

    Chun Jia, Lin Zhao, Liang Li, Yang Gao, Yuting Gao in GPS Solutions (2019)

  14. No Access

    Article

    FCB estimation with three different PPP models: equivalence analysis and experiment tests

    Precise and reliable fractional cycle bias (FCB) products are critical for ambiguity resolution of precise point positioning (PPP). Three PPP models are usually adopted to generate the FCB products, i.e., the ...

    ** Wang, Guanwen Huang, Yuanxi Yang, Qin Zhang, Yang Gao, Guorui **ao in GPS Solutions (2019)

  15. No Access

    Article

    A new datum jump detection and mitigation method of Real-Time Service (RTS) clock products

    Real-time orbit and clock products are crucial for real-time precise point positioning (PPP) applications. The International Global Navigation Satellite System (GNSS) Service (IGS) launched the Real-Time Servi...

    Liang Zhang, Hongzhou Yang, Yibin Yao, Yang Gao, Chaoqian Xu in GPS Solutions (2019)

  16. No Access

    Article

    Precise point positioning ambiguity resolution by integrating BDS-3e into BDS-2 and GPS

    With the development of BDS-3, more BDS satellites are in orbits which can contribute to the reduction in the initial time of ambiguity fixing as well as the increase in the ambiguity fixing rate. We focus on ...

    Lizhong Qu, Mingyi Du, Jian Wang, Yang Gao, Qile Zhao, Qiang Zhang… in GPS Solutions (2019)

  17. No Access

    Article

    Estimation of GPS LNAV based on IGS products for real-time PPP

    Precise satellite orbit and clock corrections are essential to precise point positioning (PPP). The standard GPS legacy navigation (LNAV) message disseminated by the satellite is one of the most widely used so...

    Peiyuan Zhou, Hongzhou Yang, Guorui **ao, Lan Du, Yang Gao in GPS Solutions (2019)

  18. No Access

    Article

    Improvement of carrier phase tracking in high dynamics conditions using an adaptive joint vector tracking architecture

    The standard vector phase-locked loop (VPLL) with fixed pre-defined process noise covariance matrix usually loses lock when the receiver experiences high dynamic conditions. Two adaptive Kalman filters (KF), w...

    Shaohua Chen, Yang Gao in GPS Solutions (2018)

  19. No Access

    Article

    Quality assessment of CNES real-time ionospheric products

    Real-time single-frequency precise point positioning (RT-SF-PPP) has become a desired positioning approach because it can achieve high positioning accuracy with a low-cost global navigation satellite system (G...

    Zhixi Nie, Hongzhou Yang, Peiyuan Zhou, Yang Gao, Zhenjie Wang in GPS Solutions (2018)

  20. No Access

    Article

    Real-time carrier phase multipath detection based on dual-frequency C/N0 data

    Since carrier phase multipath cannot be easily captured or mitigated, especially in real-time and kinematic applications, it is necessary to assess the multipath significance. We propose a real-time multipath ...

    Zhetao Zhang, Bofeng Li, Yang Gao, Yunzhong Shen in GPS Solutions (2018)

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