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http://hdl.handle.net/10397/90930
Title: | Performance assessment of GNSS diffraction models in urban areas | Authors: | Zhang, G Hsu, LT |
Issue Date: | 2021 | Source: | Navigation, Summer 2021, v. 68, no. 2, p. 369-389 | 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 (Formula presented.) and 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 requiring higher computational loads. | Publisher: | Wiley-Blackwell Publishing, Inc. | Journal: | Navigation | ISSN: | 0028-1522 | EISSN: | 2161-4296 | DOI: | 10.1002/navi.417 | Rights: | © 2021 The Authors. NAVIGATION published by Wiley Periodicals LLC on behalf of Institute of Navigation. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided theoriginal work is properly cited. The following publication Zhang, G., & Hsu, L. T. (2021). Performance assessment of GNSS diffraction models in urban areas. NAVIGATION, Journal of the Institute of Navigation, 68(2), 369-389. is available at https://doi.org/10.1002/navi.417 |
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