Radar for the detection of obstacles, especially for automobile vehicles
First Claim
1. A radar for the detection of a target, comprising:
- means for producing at least four signals wherein each of said at least four signals have separate frequency F1, F2, F3, F4 wherein F1-F3=F2-F4 and;
(F1+F3)-(F2+F4)=Cte wherein Cte is a constant frequency value;
radar means for transmitting to said target and receiving from said target said four signals having said four frequencies;
calculating means for measuring the distance from said radar to said target wherein said measure distance is a function of two distance signals wherein said first distance signal is determined by the difference between two received signals corresponding respectively to said frequencies F1 and F3 and wherein said second distance signal is determined by the difference between two other received signals corresponding respectively to the frequencies F2 and F4.
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Accused Products
Abstract
Disclosed is a radar for the detection of obstacles. The radar uses at least four frequencies referenced F1, F2, F3, F4 such that:
F.sub.1 -F.sub.3 =F.sub.2 -F.sub.4
and 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.
60 Citations
15 Claims
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1. A radar for the detection of a target, comprising:
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means for producing at least four signals wherein each of said at least four signals have separate frequency F1, F2, F3, F4 wherein F1-F3=F2-F4 and;
(F1+F3)-(F2+F4)=Cte wherein Cte is a constant frequency value;radar means for transmitting to said target and receiving from said target said four signals having said four frequencies; calculating means for measuring the distance from said radar to said target wherein said measure distance is a function of two distance signals wherein said first distance signal is determined by the difference between two received signals corresponding respectively to said frequencies F1 and F3 and wherein said second distance signal is determined by the difference between two other received signals corresponding respectively to the frequencies F2 and F4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification