FIELD: instrumentation.
SUBSTANCE: absolute laser gravity meters and relative gravity meter are mounted aboard the ship. Multiple intervals of path and time are measured by laser interferometer of absolute gravity meter. Signal variable component is isolated relative to relative gravity meter. Test body throw instruction is generated. Note here that test body throw is carried out at the base minimum vertical displacement speed calculated by integral of relative gravity meter signal component caused by ship roll. Working section of test body flight path is divided in quanta of interference signal. Adjacent quanta flight time interval difference is used to calculate instantaneous sums of free fall acceleration and base motion. Said magnitudes are averaged to get the sum of accelerations measured at throw. At test body flight time interval averaged is the relative gravity meter signal variable component. Mean magnitude of variable component is calculated from said measured sum of acceleration to store it as the measured free fall acceleration. Several throws are performed. Free fall accelerations are averaged over assemblage of throws. Obtained true free fall acceleration is used to correct the readings of relative gravity meter. For implementation of this method, absolute gravity meter (1) is placed on the base (4) and includes catapult (2) and interference pulse counter (3). Relative gravity meter (5) is placed nearby. Both gravity meters (1, 5) are connected with computer (6). Computer (6) comprises extra the unit (7) of instantaneous summed accelerations, unit (8) of mean summed acceleration, filter (9), integrator (10) of base velocity development, base mean acceleration unit (11), two comparator circuits (12, 13), accumulator (14), true free fall acceleration unit (15) and command unit (16).
EFFECT: higher accuracy of free fall acceleration measurement.
2 cl, 1 dwg
