The concept of a unified, portable, and precise navigation solution for future precise manned and unmanned air vehicle landing support would need both enhanced GNSS technology and non-GNSS (such as precise approach radar) together in one package. This concept and initial implementations are discussed. Initial evaluations using different Software-Defined-Radio (SDRs) to implement the GNSS augmentation functions are performed and compared to certified ground augmentation system receivers. The results show the promising feasibility of integrating GNSS augmentation and precise approach radar function to support future landing missions.
KEYWORDS: Antennas, Inspection, Mathematical optimization, 3D modeling, Solid modeling, Computational electromagnetics, Systems modeling, Signal to noise ratio, Modeling, Aircraft structures
Recent work on optimizing antenna installations on large flight inspection (FI) aircraft is presented. The innovative aspect of this study is an automatic procedure and tool than can optimize, analyze, and design the best antenna installation locations using a unified performance index, considering all practical constraints, including signal quality requirements, environmental effects, actual flight geometries, and others. Example design procedures and results for actual flight mission aircraft is provided.
KEYWORDS: Antennas, Satellite navigation systems, Inspection, Global Positioning System, 3D metrology, Near field, Chemical elements, Polarization, Navigation systems, Spherical lenses
We studied the technique and solutions of applying anti-jamming beamforming processing to the measured three-dimensional (3D) radiation patterns of GNSS antennas. We developed a small-scale, 2X3 custom array for demonstrating the GPS-L1 band operation. The process of measuring the 3D patterns is described. The visualization of individual and combined element pattern measurements serves as the basis for algorithm selections. The performance of anti-jamming post-processed beamforming and 3D pattern generation is evaluated using the measured pattern data. The technique and measurement process will be beneficial for the analysis of both civilian and military GNSS-based landing and navigational flight systems.
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