| 摘要 |
In a device for measuring a distance (d) between a moving object such as an aircraft (10) and a surface such as the ground (12), the microwave energy radiated by this surface is measured in two directions (alpha1, alpha2). This produces a first and second signal (s1, s2) which are functions of time. We seek the time difference between samples of these two signals which correspond to the measurement of the energy emitted from the same point (A) of the surface. From the distance (D) travelled by the moving object between these two instants, we deduce a distance (d) between the moving object and the point in question on the surface. The time differences (tau) are determined by distortion of the first signal and looking for the distortion most resembling the second signal. The method applies particularly to altimetry, the recognition of shapes and the updating of position in aerial navigation. <IMAGE>
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