EFFECT OF ACCURACY LIMITATIONS IN THE AIRBORNE DIGITAL COMPUTER ON THE CONVERGENCE OF A STAGE WISE MIDCOURSE TRAJECTORY DETERMINATION PROCEDURE
HUGHES AIRCRAFT CO CULVER CITY CA
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The effect of round-off errors on the estimation of position and velocity in midcourse navigation was analyzed. The analysis is based on Kalmans approach to linear filtering and prediction. Computation noise appears to be an additional random force in the dynamic system, and may affect both convergence and equilibrium of the sequential estimation procedure significantly. The analysis was applied to a satellite trajectory estimation system. Axes and area of the error ellipse ellipse of concentration were expressed in terms of word length, time interval between observations, and number of integration steps.
- Space Navigation and Guidance