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accuracy of 0.025 antenna ground plane approach was found carrier conductive surface parallel continuous wave critical points degrade the accuracy dispersion extracted echo-pulse edge reflections envelope function Figure fixed-frequency GHz Stop frequency Hearn highly conductive surface immunity to phase input inverse Fourier transform Langley Research Center layer of lossy less susceptibility linear phase term main lobe measurement accuracy measurement approach measurement problem Microwave Reflectometer modulation NASA Neece O(co parallel surfaces constitute phase capture phase term extracted phenomena are described plate spacing PPWG propagation primary pulse primary response produced by edge r(co radian frequency radiating system modification reduced reflecting plate reflection coefficient Reflectometer Distance Measurement response with linear secondary reflections side-lobe sideband signal simple radiating system Stop frequency 15.800 suppress parallel-plate symmetry target time-domain approach time-domain reflectometer tion transfer function trough ripple vector error subtraction vector network analyzer wave propagation waveguide WG Z-axis multiple reflections Z-axis reflections