METHOD OF GEORADAR SURVEY OF UNDERWATER LINEAR OBJECTS Russian patent published in 2018 - IPC G01V3/12 

FIELD: geophysics.

SUBSTANCE: invention relates to geophysics, namely to georadiolocation under environmental conditions of natural attenuation of electromagnetic signals, and can be used to detect linear objects, in particular pipelines, communication lines, etc. Method for georadar tracking of underwater linear objects using antenna device for a georadar containing body, unshielded antenna unit including receiving and transmitting units associated with the control and registration units and made in a hermetic version in the form of a semi-flexible hose towed by means of a vehicle, body of the device is made in plan in a Y-shape and includes parts of the lateral braces and a straight guide composed of a strong non-slip and non-metallic material, the maximum adjustable angle between the lateral braces being 135 degrees, for this purpose an arc-shaped crossbeam is installed at the outer side of the body, arc-shaped crossbeam simultaneously serves as a guide for the runner-slider of the movable beam moving between the braces by means of a drive with remote control, and a transmitting unit is attached to the movable beam from the underwater side, and to the direct guiding body – the receiving unit, control of which is carried out through the control and registration units, including the driving of the assembled antenna device towed by a water vehicle, through the inspection zone of the underwater linear object with tacks at tacking, the optimal angle α of the primary attack is predetermined for this purpose, depending on the position of the axis of the object under study, on which the position of the axis of the transmitting unit relative to the axis of the receiving block is set, then, at probing the underwater space at the time of detecting the linear object with the registration unit a hyperbola is fixed, and after a complete passage over the desired linear object, by turning the transmitter of the antenna unit set a parallel position to the direction of the desired linear object and again pass until it re-intersects with the object, while the number of repeated passages by maneuvering is determined by the task for inspection of the object, upon completion of which analyze the obtained data recorded during the sounding by the registration unit, and by intersection points establish linear mapping (section) of the position of the object.

EFFECT: use of the invention allows to increase the efficiency of georadars in the survey of linear underwater objects, including deepwater surveys and surveys of linear engineering structure located in the bottom sediments.

1 cl, 4 dwg