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.
The "Prognoz" routine has been worked out at the Astronomical Council permitting high-accuracy prediction of artificial satellites´ motion in an interval of several days. Numerical integration of equations of the motion of artificial satellites was used; the geopotential and the point-mass model to substitute it, gravitational influence of the Moon and the Sun, solar pressure, the influence of solid Earth tides and upper atmosphere drag are also taken into acount. The routine can be used to improve orbital elements, station positions, determination of coordinates of the Earth Pole and instability of the Earth rotation. Using laser ranging data of Lageos, during preliminary MERIT campaign, an accuracy of less than 1 meter for orbital elements was obtained, pole positions and LOD were calculated for intervals of 2,5 to 5 days.