Satellite systems provide the most efficient and possibly the only means of achieving two-way global communications with mobile systems (ships, aircraft, and vehicular traffic). To date, such systems have used only circular orbits, either GEO or LEO. Medium altitude elliptical constellations, on the other hand, provide an efficient and affordable alternative to these architectures. Users benefit from their very high average and minimum elevation angles, with minimum signal attenuation. Cobra Teardrop is unique in that it employs time synchronized 8-hour left- and right-leaning elliptical orbits giving mid-latitude observers the illusion of viewing a single satellite continuously orbiting almost directly overhead! In reality, they see six different satellites per day, for four hours each (while in their active duty cycles). By design, Teardrop satellites are in very close proximity at the handover points. This favorable geometry provides means to achieve a seamless handover from one satellite to the other (not requiring any electronic buffering). Handover is accomplished at the precise instant that the signal path lengths from the transmitting station through both satellites to the receiving station are exactly equal. In these Teardrop arrays, an order of magnitude increase in global communications capacity (equivalent GEO slots) can be realized over earlier Basic Cobra systems. For decades into the future, these new orbital systems could satisfy a widely expanding range of commercial, government, and military high data rate communications requirements. These would include, but not be limited to, satellite cellular, air traffic control, meteorological, and combat net radio systems. With these arrays, a much larger number of system operators could be supported, without mutual electronic interference, than would ever be possible with circular orbits.
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