Open AccessPerformance assessment of GNSS diffraction models in urban areas
Author(s) -
Zhang Guohao,
Hsu LiTa
Publication year - 2021
Publication title -
navigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.847
H-Index - 46
eISSN - 2161-4296
pISSN - 0028-1522
DOI - 10.1002/navi.417
Subject(s) - non line of sight propagation , gnss applications , diffraction , pseudorange , multipath propagation , computer science , uniform theory of diffraction , signal (programming language) , enhanced data rates for gsm evolution , remote sensing , geodesy , telecommunications , global positioning system , optics , geography , physics , channel (broadcasting) , wireless , programming language
Abstract The GNSS performance is significantly degraded in urban canyons because of the signal interferences caused by buildings. Besides the multipath and non‐line‐of‐sight (NLOS) receptions, the diffraction effect frequently occurs in urban canyons, which will severely attenuate the signal strength when the satellite line‐of‐sight (LOS) transmitting path is close to the building edge. It is essential to evaluate the performance of current diffraction models for GNSS before applying mitigation. The detailed steps of applying the knife‐edge model and the uniform geometrical theory of diffraction (UTD) model on GNSS are given, including the C / N 0and pseudorange simulation of the diffracted signal. The performances of both models are assessed using real data from two typical urban scenarios. The result shows the UTD can adequately model the GNSS diffraction effect even in a complicated urban area. Compared with the knife‐edge model, the UTD achieves better modeling accuracy, whereas it requires higher computational loads.