Patent ID: 11953587
Assignee: IDS GEORADAR S.R.L.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for detecting positions of objects under a surface with respect to a reference Cartesian system S(x, y) having origin O(0,0) and axes x and y, said method comprising the steps of:
prearranging a GPR apparatus, said GPR apparatus comprising:
a GPR sensor;
a distance detecting unit configured to measure a distance with respect to a non-transparent object;
a control unit; and
a center of reference C(xc, yc) having coordinates xc and yc on said reference Cartesian system S(x, y);

prearranging a first linear wall, said first wall having direction parallel to said axis x of said reference Cartesian system S(x, y);
handling said GPR apparatus on said surface along a trajectory γ;
detecting, by means of said distance detecting unit, a first measurement of distance between said distance detecting unit and said first linear wall;
processing said first measurement of distance by means of said control unit in order to calculate said coordinate yc of said center of reference C(xc, yc);
prearranging a second linear wall, said second wall having direction parallel to said axis y of said reference Cartesian system S(x, y);
detecting, by means of said distance detecting unit, a second measurement of distance between said distance detecting unit and said second linear wall;
processing said second measurement of distance by means of said control unit in order to calculate said coordinate xc of said center of reference C(xc, yc);
repeating, by means of said distance detecting unit, said steps of detecting and processing said first measurement of distance at time intervals τ in order to calculate a change of said coordinate yc during said step of handling;
associating a coordinate yi=yci to an i-th object detected, where yci is value of said coordinate yc at the detection by said GPR sensor of said i-th object;
repeating, by means of said distance detecting unit, said steps of detecting and processing said second measurement of distance at time intervals r in order to calculate a change of said coordinate xc during said step of handling;
associating a coordinate xi=xci to an i-th object detected, where xci is the value of said coordinate xc at the detection by said GPR sensor of said i-th object;
verifying, on the basis of said change of said coordinates xc and yc, that said trajectory γ coincides with a predetermined trajectory γ′; and
in case that said step of verifying is negative, correcting said trajectory γ along which is carried out said step of handling, by means of said distance detecting unit.