= Dave Doody
{c}
An engineer who helped connect spacecraft operations with teaching about <celestial mechanics>. NASA identifies him as the author of the 2017 edition of <Basics of Space Flight (2017 edition) by Dave Doody> and as a flight-operations engineer for the Cassini mission. His navigation chapter explains how radio <Doppler effect> measurements constrain spacecraft velocity while signal travel times constrain distance, turning received radio signals into information for <orbit determination>.<Basics of Space Flight (2017 edition) by Dave Doody>[Editorial page: authorship and flight-operations role]{ref}<Basics of Space Flight (2017 edition) by Dave Doody/Chapter 13: Navigation>[Spacecraft Velocity Measurement and Spacecraft Distance Measurement]{ref}
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