The Sonic Simulator can be readily forced to deal with the same noise characteristics as the ionosphere would introduce into the real world SPS phase control system, This would be accomplished by altering the propagation of the simulator's sonic beam through the use of sculptured reflecting surfaces and controlled air turbulance. Ionospheric effects will impact an SPS Phase Control System similar to the way that noise and offset error impact any closed loop servo system. Therefore, conventional control system synthesis techniques should be able to reduce SPS phase control errors due to ionospheric effects. Ayalytical techniques will be developed to permit the validation of these sonic propagation models against measured ionospheric parameters. This would, for example, lead to the quantitative correlation of ionospheric electron density patterns with the sound reflecting surface's roughness and placement. FIGURE 3 PHOTOGRAPHIC SCANNING SYSTEM A precision mechanical scanning system provides an actual photograph of the sonic beam. The camera lens remains open in a darkened room while the sound- to-light modulator (device being pointed at) provides a light output proportional to the intensity of the sonic beam. The modulator is scanned up and down and forward and backward to provide a photograph of a cross section of the beam. FIGURE 2 SONIC SPACETENNA
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