ABSTRACT
Navigation is the determination of the position and velocity of the mass center of a moving vehicle. The three components of position and the three components of velocity make up a six-component state vector that fully describes the translational motion of the vehicle because the differential equations of motion are of second order. Surveyors now use some of the same sensors as navigators but are achieving higher accuracy as a result of longer periods of observation, a fixed location, and more complex, non-real-time data reduction.
