Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/67107
Title: Analysis of multipath pixels in sar images
Authors: Zhao, JW 
Wu, JC
Ding, XL 
Zhang, L 
Hu, FM
Keywords: Multipath
Signal Propagation
RaySAR
Statistic Index
Characteristics Of Radar Signal
Analysis Of Multipath Pixels
Issue Date: 2016
Publisher: Copernicus GmbH
Source: International archives of the photogrammetry, remote sensing and spatial information sciences, 2016, v. XLI-B7, p. 873-877 How to cite?
Journal: International archives of the photogrammetry, remote sensing and spatial information sciences 
Abstract: As the received radar signal is the sum of signal contributions overlaid in one single pixel regardless of the travel path, the multipath effect should be seriously tackled as the multiple bounce returns are added to direct scatter echoes which leads to ghost scatters. Most of the existing solution towards the multipath is to recover the signal propagation path. To facilitate the signal propagation simulation process, plenty of aspects such as sensor parameters, the geometry of the objects (shape, location, orientation, mutual position between adjacent buildings) and the physical parameters of the surface (roughness, correlation length, permittivity)which determine the strength of radar signal backscattered to the SAR sensor should be given in previous. However, it's not practical to obtain the highly detailed object model in unfamiliar area by field survey as it's a laborious work and time-consuming. In this paper, SAR imaging simulation based on RaySAR is conducted at first aiming at basic understanding of multipath effects and for further comparison. Besides of the pre-imaging simulation, the product of the after-imaging, which refers to radar images is also taken into consideration. Both Cosmo-SkyMed ascending and descending SAR images of Lupu Bridge in Shanghai are used for the experiment. As a result, the reflectivity map and signal distribution map of different bounce level are simulated and validated by 3D real model. The statistic indexes such as the phase stability, mean amplitude, amplitude dispersion, coherence and mean-sigma ratio in case of layover are analyzed with combination of the RaySAR output.
Description: 23rd Congress of the International-Society-for-Photogrammetry-and-Remote-Sensing (ISPRS), Commission VII, 12–19 July 2016, Prague, Czech Republic
URI: http://hdl.handle.net/10397/67107
ISSN: 1682-1750
EISSN: 2194-9034
DOI: 10.5194/isprsarchives-XLI-B7-873-2016
Rights: © Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.
This publication Zhao, J. W., Wu, J. C., Ding, X. L., Zhang, L., and Hu, F. M.: Analysis of multipath pixels in sar images, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., 2016, XLI-B7, 873-877, is available at https://doi.org/10.5194/isprs-archives-XLI-B7-873-2016.
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