IMPULSIVE MULTI-CHANNEL GROUND PENETRATING RADAR

摘要

A method for detecting, by means of radar techniques, objects immersed in a material, which uses an antenna, or an array of antennas, driven by a first and a second circuit that generate respectively reception and transmission triggering signals in a digital domain and then convert them into analog pulses respectively of periods T and T+S. Two identical circuits (10' and 10") are used for generating respectively transmission and reception triggering pulses (20' and 20"). They are operated in parallel by a microcontroller (21) that administers said first and second circuit supplying as input to them respectively a first counting duration (11') and a second counting duration (11") that are different from each other for a numerical value derived from said periods T and T+S. This way, the periodic signal (17') resulting from said first circuit (10') and the periodic signal (17") resulting from said second circuit (10") have respectively a first and a second frequency f(l) and f(2) that are different from each other for a frequency value derived from said range S. The timing circuit carrying out a sample-conversion of the frequency of the received signals not subject to misadjustment of the time scale and much more flexible concerning the programmation of time setting.