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AAPS acceptance data accuracy goal AFCRL Air Force Cambridge air-launched ALBS altitude antenna aperture application Array Pattern balloon systems beam Birefringent Cambridge Research Laboratories configuration data points data rejection schemes detector diameter directive gain element pattern evaluation Force Cambridge Research Four-Element SBF Array free-flying balloons frequency fuel cell grating lobe ground-launched H Planes Hanscom AFB HASPA program horn hr/RP interferogram interferometer launch lens Massachusetts 01731 measurements Meteorological minimum wind field nadir noise null observations odd mode operation optical payload performance phase platform POBAL-S polarization polyester film powered balloon problem propulsion radar Radiation Patterns reflector relay RP's satellite scan angle SEEK STAR mission shown in Figure sidelobe signal signal-to-noise ratio solar cells solar image spectral spectrum superheat superpressure balloons Table technique tethered balloons Unclassified SECURITY CLASSIFICATION V/N V/N V/N velocity wavelength waveplate Wollaston prism Zeeman splitting zero-pressure balloons