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This paper deals with astro Doppler velocity measurement for space vehicle navigation. The measurement yields the relative velocity of the vehicle with respect to a star, and requires the use of electro-optical systems capable of measuring a small incremental change in the wavelength of propagated stellar energy. Such systems provide velocity data whose character and limitations are a function of the star's spectral radiation as well as the system instrumentation. This paper discusses the astro velocity data, its derivation, character, and limitations; and the Doppler velocity systems, their capabilities, limitations, and possible instrumentation.