scholarly journals Ultra-Wideband Indoor Channel Modelling Using Ray-Tracing Software for through-the-Wall Imaging Radar

2010 ◽  
Vol 2010 ◽  
pp. 1-14 ◽  
Author(s):  
Christophe Lièbe ◽  
Pierre Combeau ◽  
Alain Gaugue ◽  
Yannis Pousset ◽  
Lilian Aveneau ◽  
...  
Keyword(s):  
Experimental Method ◽  
Ray Tracing ◽  
Wide Band ◽  
Ultra Wideband ◽  
Channel Response ◽  
Imaging Radar ◽  
Wideband Signals ◽  
Simulation Results ◽  
Simulated Images ◽  
Wall Imaging

This paper presents a new software for design of through-the-wall imaging radars. The first part describes the evolution of a ray tracing simulator, originally designed for propagation of narrowband signals, and then for ultra-wideband signals. This simulator allows to obtain temporal channel response to a wide-band emitter (3 GHz to 10 GHz). An experimental method is also described to identify the propagation paths. Simulation results are compared to propagation experiments under the same conditions. Different configurations are tested and then discussed. Finally, a configuration of through-the-wall imaging radar is proposed, with different antennas patterns and different targets. Simulated images will be helpful for understanding the experiment obtained images.

Ultra-wideband elliptical patch antenna for microwave imaging of wood

2019 ◽  
Vol 11 (9) ◽  
pp. 948-966 ◽  
Author(s):  
Tale Saeidi ◽  
Idris Ismail ◽  
Wong Peng Wen ◽  
Adam R. H. Alhawari
Keyword(s):  
Low Frequency ◽  
Wide Band ◽  
Microwave Imaging ◽  
Ultra Wideband ◽  
Uniform Illumination ◽  
Elliptical Shape ◽  
Measurement Results ◽  
Simulation Results ◽  
Strip Loading ◽  
Good Agreement

AbstractThis paper presents the design of an elliptical shape ultra-wide band antenna for imaging of wood. The antenna is constructed comprising an elliptical shape of patch loaded by a stub to resonate at lower bands, strip loading at the back, and chamfered ground. Despite having miniaturized dimensions of 20 mm × 20 mm, the proposed antenna shows better results compared to recent studies. The simulation results depict a good ultra-wide bandwidth from 2.68 to 16 GHz, and 18.2–20 GHz. Besides, the proposed antenna has two low-frequency bands at 0.89–0.92 and 1.52–1.62 GHz, maximum gain of 5.48 dB, and maximum directivity of 6.9 dBi. The measurement outcomes are performed in air, plywood, and high-density wood and show a good agreement with the simulated results done using electromagnetic simulator CST. In addition to that, the measurement results of S-parameters, transmitted and received signals show a good agreement with the simulated results. Besides, the measured results illustrate a good isolation and uniform illumination among arrays as well as the received signals' shapes do not change in different environments, but only the amplitude. Hence, the proposed antenna seems to be adequate for microwave imaging of wood.

scholarly journals Performance Evaluation of Different Modulation Schemes for Ultra Wide Band Systems

2014 ◽  
Vol 65 (3) ◽  
pp. 184-188 ◽  
Author(s):  
Tasnuva Ali ◽  
Poppy Siddiqua ◽  
Mohammad A. Matin
Keyword(s):  
Short Distance ◽  
Narrow Band ◽  
Wide Band ◽  
Performance Comparison ◽  
Ultra Wideband ◽  
Good Resolution ◽  
Transmission Power ◽  
Large Bandwidth ◽  
Simulation Results ◽  
Modulation Schemes

Abstract Ultra-wideband (UWB) signals with a large bandwidth has some advantages like multipath immunity, low transmission power, good resolution for ranging and detecting geo locations, as well as it can resist to narrow-band interference. These signals are used for transmission in short distance with high throughput. In this paper, we have analyzed different modulation schemes for performance comparison in terms of BER with UWB Gaussian second derivative monopulse and wavelet-based monopulse. The simulation results demonstrate that wavelet-based monopulse provides better performance in comparison to the other two monopulses.

scholarly journals Synchronization Method and Detection of Sequent Signals in the Ultra Wide Band Channel

2020 ◽  
Vol 6 (2) ◽  
pp. 19-29
Author(s):  
V. Borisov ◽  
S. Dvornikov ◽  
A. Pshenichnikov ◽  
M. Semisoshenko
Keyword(s):  
Computational Complexity ◽  
Wide Band ◽  
Ultra Wideband ◽  
Ultra Wide Band ◽  
Simultaneous Solution ◽  
Practical Application ◽  
Temporal Parameters ◽  
Wideband Signals ◽  
Physical Features ◽  
Technical Solutions

The physical features of ultra-wideband signals are considered. The well-known technical solutions for synchronizing signals during their accumulation are analyzed. The necessity of randomizing the temporal parameters of the following pulse their accumulation is substantiated. The main steps of the technique are described that allow the simultaneous solution of the problem of detecting sequential signals by accumulating them on the receiving side and synchronizing them. An assessment of the computational complexity of the technique is presented and recommendations for its practical application are given.

Indoor target localization using single marginal antenna with virtual radars support

2017 ◽  
Vol 9 (9) ◽  
pp. 1863-1870
Author(s):  
Ali H. Muqaibel ◽  
Abdi T. Abdalla ◽  
Mohammad T. Alkhodary
Keyword(s):  
Target Localization ◽  
Ultra Wideband ◽  
Timing Errors ◽  
Single Antenna ◽  
Wideband Signals ◽  
Wide Range ◽  
Correct Location ◽  
Simulation Results ◽  
Dependence Property

In urban target localization, the presence of walls creates virtual radars (VRs), which can be exploited to aid in localization process. The fact that multipath changes with the radar locations, which are referred to as aspect dependence property, enable us to find a radar location, which reduces wall uncertainties. This paper proposes single-antenna target localization in an enclosed structure taking advantage of VRs. Using ultra-wideband signals, we can resolve the target returns and estimate the correct location by solving monostatic loci at real and VR locations. Simulation results show that the method can precisely and accurately localize the target for a wide range of timing errors.

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