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An X-Band Monopulse Direction-Finding Receiver Based on a Rat-Race Comparator and a Antipodal Vivaldi Array
M. Ahmad Nabil, Sohaib Yaqoob Chaudhry, Salman Liaquat
This paper presents the design, fabrication, and experimental validation of a compact monopulse direction-finding (DF) receiver operating in the X-band. The receiver combines a $2…
Design and Experimental Validation of a Multiband Cross-Polarization Conversion (CPC) Metasurface for Radar Cross Section (RCS) Reduction
Sohaib Yaqoob Chaudhry, Malik Muhammad Abdullah, Salman Liaquat +3
Radar cross-section (RCS) reduction is a fundamental requirement in modern stealth technology, playing a critical role in the low-observable performance of aerial and naval platfor…
A Closed-Form Noise-Sensitivity Asymmetry for Causal Branch Selection in Minimal-Array TDoA Localization
Abeer Nasir Chaudhry, Salman Liaquat, Hasan Saeed Mir
Minimal-array time-difference-of-arrival (TDoA) localization with three planar receivers reduces to a scalar quadratic whose two roots can both be feasible target positions, leavin…
: A Geometry-Quality Metric Complementary to GDoP for Closed-Form TDoA Multilateration
Abeer Nasir Chaudhry, Salman Liaquat, Muhammad Mohsin Khadim
The Geometric Dilution of Precision (GDoP) characterizes the noise sensitivity of a Time-Difference-of-Arrival (TDoA) localization system, but does not capture every way the analyt…
Feature-Level Robustness of Physics-Guided Micro-Doppler Descriptors for classification of Drones and Birds
Shaiq e Mustafa, Salman Liaquat, Imran Hafeez Abbasi +1
Micro-Doppler signatures are a proven modality for discriminating between drones and birds, but their reliability degrades in low-SNR, data-constrained settings where deep learning…
Dual RIS-Assisted Monostatic L-Band Radar Target Detection in NLoS Scenarios
Salman Liaquat, Ijaz Haider Naqvi, Nor Muzlifah Mahyuddin
The use of a single Reconfigurable Intelligent Surface (RIS) to boost the signal-to-noise ratio (SNR) at the radar offers significant improvement in detecting targets, especially i…
SDR-Based Metal Classification using Spectrogram Images from Micro-Doppler Signatures
Salman Liaquat, Faran Awais Butt, Faryal Aurooj Nasir +4
Metallic materials such as brass, copper, and aluminum are used in numerous applications, including industrial manufacturing. The vibration characteristics of these objects are uni…