METHOD FOR MARINE GRAVIMETRIC SURVEY AND APPARATUS FOR IMPLEMENTATION THEREOF Russian patent published in 2022 - IPC G01V7/16 

FIELD: measuring.

SUBSTANCE: group of inventions relates to the field of marine gravimetric survey. Substance: the parameters of the gravitational field of the Earth are measured by gravimetric sensors placed on a mobile carrier while moving the mobile carrier over a system of profiles covering the survey area. The position of the carrier at the time of measurement is determined using the inertial navigation system or hydroacoustic navigation systems thereof. One or multiple reference gravimetric points are deployed in the survey area. The coordinates of gravimetric points are determined and reference measurements of gravitational accelerations (GA) are taken thereon. The reference measurements of GA are therein taken by means of a carrier submerged to the bottom, prior to the survey or upon completion thereof. In order to reduce the result for the survey horizon and the average sea level, the vertical gradient of the GA is measured with a gradiometer during submerging to the bottom and upon surfacing. To conduct the survey of the spatial distribution of the GA on the carrier during movement thereof, the components of the GA gradient are measured along the axes of a topocentric coordinate system. The distances traveled by the carrier along said axes are simultaneously measured using the navigation system of the carrier, starting from the reference point until the end of the survey at the original reference point. Using the measurement results, the values of the GA are calculated at marine gravimetric points. The apparatus for implementation of the method includes gravimetric sensors (3-8), a hydraulically stabilisable platform (2) for reproducing the topocentric coordinate system, an electronic power and control unit (9) for the gravimetric sensors, a computing unit (10) for processing the measurements and a unit (11) for recording the measurement processing data. Accelerometers installed in pairs on the platform (2) hydrostabilised along the axes of the reproducible topocentric coordinate system, symmetrically and at a strictly fixed distance relative to the beginning thereof are therein used as gravimetric sensors (3-8). The outputs of the accelerometers (3-8) are connected in pairs with the electronic power supply and control unit (9) so as to be capable of transmitting the generated sample mass displacement signals thereto in order to convert said signals into acceleration signals. The outputs of the electronic power supply and control unit (9) are connected with the computing apparatus (10) for subsequent calculation of the components of the GA gradient based on the acceleration signals measured in pairs and the value of the GA at the marine gravimetric points.

EFFECT: increase in the accuracy of marine gravimetric survey.

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