Radar system for locating pipes buried in the ground and detecting underground leaks of liquid, particularly water, with a square waveguide antenna to emit orthogonally polarized signals of the same frequency.

Abstract

A radar system for locating buried pipes and detecting underground liquid leaks, particularly water leaks, with a square waveguide antenna for emitting orthogonally polarized signals of the same frequency. The invention essentially consists of a radar system (1) with an antenna (4) capable of emitting waves at a nominal frequency towards the ground with two distinct and orthogonal polarizations, and incorporating a measuring element (5) capable of measuring the polarimetric ratio of the received signals according to the two polarizations, in order to deduce from the imbalance between the two received signals the presence of a buried pipe, and where applicable, the presence of liquid leaks, particularly water leaks. Figure for the abstract: Fig. 1

Claims

being configured to measure the amplitude and phase differences of the signals from the magic T.

8. Radar system according to any one of the preceding claims, comprising two identical variable phase shifters, each connected to a circulator and a radiating transition, adapted to be continuously adjusted during continuous measurement by the measuring element.

9. Vehicle comprising a support on which the antenna of the radar system according to any one of the preceding claims is mounted so that the waveguide can be oriented towards the ground.

10. Vehicle according to claim 9, the antenna being pivotally mounted on the support, and optionally motorized, so as to be able to modify the angle of orientation of the two vertical and horizontal polarizations (V and H), with respect to the possible pipeline buried in the ground. [Fig. 3] Signal H Digital power measurement H+V Digital measurement of j power / of H / V [Fig. 4] | Signal H Measurement X / digital \ { of the difference j \ of amplitude and / phase Signal V ; _________ / --------- / / Calculation of \ (the power ) V of H / V

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