The exploitation of a mode locked train laser pulse for satellite ranging has been used. The Nd YAG oscillator/amplifier/frequency doubler/laser generates a mode locked train at 0.53um, most of the energy is contained in three pulses, the individual pulse duration is 70psec. During the 1963 Merit Campaign, within 4 months, 10 low satellite passes and 31 Lageos passes have been ranged. When tho mode locked substructure has been resolved for the received signal (50 % of passes), the BMS was 6-8 cm.
A method is given for constructing the proper spline. The necessary expressions for the variances of the normal places taken at two neighbouring polynomials and their covariance are found and given.
A method is given to make use of the progress is the observational instruments used nowadays so that a Laser Tracking Station can depend on its observations to carry out predictions for its needs. The stability of the method is discussed. A computer routine is then given which illustrates the procedure discussed.