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Title: Vector tracking loop-based GNSS NLOS detection and correction : algorithm design and performance analysis
Authors: Xu, B 
Jia, Q 
Hsu, LT 
Keywords: Global navigation satellite system (GNSS)
Nonline-of-sight (NLOS) reception
Vector tracking loops (VTL)
Software-defined receivers (SDR)
Urban canyon
Issue Date: 2019
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on instrumentation and measuremet, 2019, p. 1-17, How to cite?
Journal: IEEE transactions on instrumentation and measuremet 
Abstract: This paper deals with the non-line-of-sight (NLOS) reception issue in the field of global navigation satellite system (GNSS). The NLOS reception has attracted a significant amount of attention because it is one of the main factors that limit the GNSS position accuracy in urban areas. In this work, we dig into the baseband signal processing level to explore a new solution to the NLOS detection and correction by means of the vector tracking loop (VTL). The NLOS effects on both conventional scalar tracking loops (STL) and VTL are derived mathematically. Based on this, an NLOS detection algorithm is developed using metrics such as the equivalent noise bandwidth, the time delay of multi-correlator peaks, as well as code discriminator outputs. Once detected, the NLOS-induced measurement error is corrected before being fed forward into the navigation estimator to improve the position accuracy. Two field tests in urban areas in Hong Kong are conducted to illustrate the effectiveness of the proposed method in real applications. The NLOS correction performance is also assessed using simulated NLOS receptions with controllable time delays and reflection coefficients, which reveals how the proposed algorithm performs in different NLOS scenarios.
ISSN: 0018-9456
EISSN: 1557-9662
DOI: 10.1109/TIM.2019.2950578
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