Abstract
A radio command guidance system is described which is useful for guiding a probe from the surface of Mars to rendezvous with a mission module flying by Mars on an escape trajectory. Lightness and simplicity are the design goals. The system includes, in the ascent vehicle, a radar transponder, a three axis gyroscope dependent autopilot and a three channel radio command system. In the larger mission module, there is a radar, a computer for navigation and guidance calculations, and a command transmitter. The paper describes the system and shows the effect of various errors on the total fuel required.
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