Patent ID: 7167126
Filing Date: 2007-01-23
Classification: G01S

Abstract:
1. A system for determining a height h of an object on the ground and reflecting a real beam radar signal, said system comprising: a first antenna having a central point at a height l above the ground and wherein R is the distance from the vertical plane of the first antenna to the object, said first antenna receiving the reflected real beam radar signal and providing a first antenna output signal corresponding to the reflected real beam radar signal received by the first antenna; a second antenna receiving the reflected real beam radar signal and providing a second antenna output signal corresponding to the reflected real beam radar signal received by the second antenna; wherein the central point of the first antenna is positioned in a horizontal plane which is different than a horizontal plane in which the central point of the second antenna is positioned and wherein the central point of the first antenna is positioned at a vertical distance d from the central point of the second antenna; a first receiver for receiving the first antenna output signal and providing a first receiver output signal indicating the phase of the signal received by the first antenna; a second receiver for receiving the second antenna output signal and providing a second receiver output signal indicating the phase of the signal received by the second antenna; and a processor for receiving the first receiver output signal and the second receiver output signal and for providing an output signal corresponding to the height of the object, wherein the output signal is a function of the phase difference Φ between the first antenna output signal and the second antenna output signal, the distance R, the height l and the distance d.