Delay simulator to apparatus for measuring distance a continuous wave at frequency modulated

摘要

The apparatus, fm - cw 1 to be tested, produces a beat signal fb fb between a frequency waves and recue emise. The simulator is intended to be connected to this apparatus 2 - 4, 3 - 5. According to the invention, the simultateur comprises a processing chain of the signal, constituted by a first switch hf 6, a circulator 7 and a second switch hf 8, a delay line 11 working in reflection, providing the delay t and connected to an input - output of the circulator, and means for controlling the switches 26, 28, 29 33 which are closed at a frequency f (f 2b), the first for d (1f) of the second for d (d / d). The phase shift between d and d (t) is such that the durations d and d are separated and that at least an echo of the order p in the line a delay which satisfies the equation: p.t ff t, k being an integer. / p & & p & application to the test of precision of a radioaltimeter.