Radar for the detection of obstacles, especially for automobile vehicles

摘要

Disclosed is a radar for the detection of obstacles. The radar uses at least four frequencies referenced F1, F2, F3, F4 such that:F1-F3=F2-F4and such that: (F1+F3)-(F2+F4)=Cte where Cte represents a constant frequency value, the measurement of distance from the target being done on the basis of the difference in phase between two signals of which the first (r1(t)-r3(t)) is constituted by the difference between two received signals corresponding respectively to the frequencies F1 and F3 and the second (r2(t)-r4(t)) is constituted by the difference between two received signals corresponding respectively to the frequencies F2 and F4. Application in particular to automobile speed control.