Study and Applications of Retrodirective and Self-adaptive Electromagnetic-wave Phase Controls to a Mars Probe, Issue 977
National Aeronautics and Space Administration, 1968 - Adaptive antennas - 232 pages
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The CylindricalGeodesicLens Biconica 1Horn
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adaptive antenna altitude amplitude amplitude modulation antenna configurations antenna elements antenna gain antenna operation antenna types aperture assumed average axial azimuthal angle azimuthal direction beam beamwidth breakdown carrier frequency characteristics circuitry Circular Array computed cylindrical lens density diameter Doppler shift earth earth's atmosphere effective radiated power effects electron elemental antenna elemental radiator entry capsule environment fluctuations function geodesic lens interplanetary ionosphere line-source radiators Mars atmosphere maximum measured modulation mutual coupling number of elements obtained OPEN WAVEGUIDE oscillator parameters peak phase phase jitter phase-locked loops pilot signal planetary reflected radiated power radiation pattern rays receive and transmit refractive relative reradiated retransmitted retro retrodirective antenna retrodirective array retrodirective subapertures rotation shown in Fig sideband sidelobes signal received single element spectral splitting spectrum spin axis Stanford Research Institute surface technique transmit frequencies transmitted signal Type-1 antenna value of gain variation velocity voltage wavelengths