This report is concerned with the problem of real-time filtering of gravity-gradiometer readings onboard a uniformly horizontally moving vehicle to produce estimates of the gravity deflection and gravity anomaly at the vehicle's position. (Author)
In this report the conjugate point condition was derived in the classical calculus of variations from a control-theoretic point of view. The relationship of conjugate point condition to relative minimum in optimal control problem was discussed. (Author)
This report describes a computational program, now in existence, for estimating the accuracy with which satellite positions can be calculated at any time on the basis of observations at various stations. The error in computed position is due to two main causes, at least if station location uncertainties are ignored. These are: (A) observation errors, (B) fluctuations in the orbital decay rate due to drag. It is assumed here that ...
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