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Annals of Geophysics
Lì rie fi y are discussed the priucipal aspects of " spacenavigation ". which can be divided in three phases:circuinnavigation of the Earth (parking orbit or departure);middle or interplanatery navigation;approach and landing 011 the pia net.The radio-assistence from the Earth, with transponder, may play theprincipal iole for the first two phases, while for the last phase, the astronautamust rely 011 the self-contained navigation: electronics and observation.The energy reserve reduce» thedoi:10.4401/ag-5241 doaj:70de0b6b89f14dd98730c63102504883 fatcat:ojfqizbp5zdlxjpjhv55snc6o4