Dr. Ahmad Esmaeilkhah
Electrical Engineering, École de technologie supérieure (ÉTS), Montréal, Quebec, Canada
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Academic Career Length
9Years (2018-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications30 December 2018 in Advanced Electromagnetics
Journal Article
Ahmad EsmaeilkhahCGC. Ghobadi
C. Ghobadi
JNJavad Nourinia
Javad NouriniaMMM. Majidzadeh
M. Majidzadeh
This paper aims at investigating the effect of planar scaling on Microstrip patch antenna performance. To this end, nine antennas with different sizes are fabricated on the same FR4 substrate with thickness of 1mm with different scale factors. Results indicate some deviations between the obtained expected, simulated and measured resonant frequency which could be mainly due to the truncation error effect, and the SMA connector effect in the scaling process. All the influential factors are studied in detail through the paper. Detailed discussion on the scaling process and its effect on the antenna performance would be presented.
29 January 2018 in Advanced Electromagnetics
Journal Article
Ahmad EsmaeilkhahNLN. Lavasani
N. Lavasani
Satellite-based navigation systems, as one of the key infrastructure of development in manned and unmanned guidance systems, is vulnerable against the simplest form of attack in Electronic Warfare environments. This led us to investigate the described vulnerability of an airborne GPS receiver against jammers which are located at various altitude above the targeted point. To do that and to avoid encountering with unavailability of classified information about military-class missiles, some simplification was done and the problem was investigated in “Worst Case” conditions. Finally, the flight profile and radiation pattern of the antenna of the GPS receiver were theoretically modeled. Considering some assumptions, the other parameters were derived from them. At the end, a simulation software was developed and some results were extracted. The data was represented figuratively and the dependency of efficacy of jamming operation to the jammer’s altitude and flight profile of the missile were discussed.
Conference Paper
Ahmad EsmaeilkhahRLRene Jr Landry
Rene Jr LandryThis paper presents a thorough investigation into the EKF-based SoOP navigation algorithm’s sensitivity to spatial parameters and receiver- and transmitter-related properties. Utilizing the innovative SoOPNE simulation platform, our study unveils significant insights. For instance, at high latitudes, Iridium-Next, and Oneweb show a ten-fold accuracy improvement over Orbcomm. Additionally, discrepancies between predicted and actual satellite trajectories, with a nominal drift of approximately 250 m, result in navigation errors of around 400 m. Our findings underscore the critical importance of addressing these factors to optimize SoOP navigation performance.
Conference Paper
Ahmad EsmaeilkhahRLRene Jr Landry
Rene Jr LandryThis paper addresses the critical issue of unwanted interference in airborne GNSS receivers, crucial for navigational safety. Previous studies often simplified the problem, but this work offers a comprehensive approach, considering factors like Earth’s reflective properties, 3D calculations, and distinct radiation patterns. It introduces Spatial Interference Distribution Expression Heat-map and Operation Efficacy Plot graphs to visualize interference distribution along flight paths. The results highlight the significance of physical configuration and distance from interference sources on receiver performance. The algorithm developed can assess interference effects on GNSS receivers and aid in selecting optimal flight paths for minimal interference. This research enhances understanding and management of unintentional interference in airborne navigation systems.
4 September 2018 in Advanced Electromagnetics
Journal Article
Ahmad EsmaeilkhahCGC. Ghobadi
C. Ghobadi
JNJavad Nourinia
Javad NouriniaMMM. Majidzadeh
M. Majidzadeh
The Maxwell field equations (MFEs), as ecumenical model of electromagnetic phenomena, are scale-invariant under Lorentz Transformation (LT). To apply LT, some considerations are required which are not all practically available or technologically attainable; hence, the scale-invariant feature may not be reached effectively. Paving the way to focus on this issue, the effect of substrate thickness scaling as an uncontrollable parameter, is explored on eight identical patch antennas with different substrate thicknesses. In this way, the resonant frequency and complex value of return loss are measured. The effect of manufacturing tolerances of dielectric thickness on resonant frequency deviation and return loss magnitude are carefully studied, too. Also the unwanted distortive effect of selected electrical connection, say as a female SMA connector, is investigated at higher frequencies. The obtained results are comparatively analyzed which confirm the practical bottlenecks in meeting the antenna parameters scaling.
16 May 2019 in Advanced Electromagnetics
Journal Article
Ahmad EsmaeilkhahDeception of navigational subsystems of a client, ranging from a hunting GPS receiver to the military-class GNSS receiver onboard of a Cruise Missile, is one of the probable electronic attacks. One of the simplest and practical way too deceive these receivers is to re-broadcast the delayed navigational signals. The authors were studied the feasibility of this method in the “Best” attainable conditions while the generality of study retained. The results from introduced geometrical and mathematical models were used to define the minimum and maximum operational range of Repeater Deception System parametrically. Then the parameters were substituted by information of various GNSS constellations. Investigation of reliability of selected EW scenario concluded the article.
About Me
Ahmad Esmaeilkhah is an Associate Research Fellow at the Department of Electrical Engineering at École de Technologie Supérieure (ÉTS), where he has been a member of the LASSENA Laboratory since 2023. His areas of expertise include embedded systems, navigation, radar systems, RF, and antenna design, with applications spanning wireless sensor networks (WSN), radar, transportation tracking systems, GNSS spoofing detection, and space technologies. His recent research focuses on Positioning, Navigation, and Timing (PNT) using Low Earth Orbit (LEO) Signals of Opportunity (SoOPs). He earned his Telecommunication Engineering degree from Shahid Sattari Aeronautical University, Tehran, Iran, in 2005, followed by an M.Sc. in the same field from Islamic Azad University, Science and Research Branch, Urmia, Iran, in 2014. He received his Ph.D. from Urmia University in 2013, where he researched the scale invariability of Maxwell’s equations and its application in microstrip antenna design using the "scaling" method. In 2023, he joined ÉTS as a postdoctoral researcher, focusing on satellite navigation with an emphasis on the application of SoOPs for navigation, positioning, and timing.
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