Methods and apparatus for optimizing interferometric radar...

G - Physics – 01 – S

Patent

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G01S 7/40 (2006.01)

Patent

CA 2529004

An apparatus (100) for calibrating a radar altimeter (10) is described. The altimeter provides an angle to a target based on radar energy received at right (20), left (16), and ambiguous (18) antennas. The apparatus comprises a turntable (104) on which the radar is mounted, a turntable controller (106) which controls positioning of the radar altimeter, a radar energy source receiving transmit signals (110) from the radar altimeter, a reflector (122), and a calibration unit (128). The reflector reflects and collimates radar energy (124) from the radar source towards the radar altimeter. The calibration unit receives an angle (108) from the controller indicative of a position of the radar altimeter with respect to the collimated radar energy and a measured angle (126) from the radar altimeter. The calibration unit calculates a correction (72) based on differences between the angle received from the turntable and the measured angle received from the altimeter and provides the calibration correction to the altimeter.

La présente invention concerne un appareil (100) qui permet d'étalonner un altimètre radar (10). L'altimètre fournit un angle à une cible sur la base d'une énergie radar reçue par des antennes droite (20), gauche (16) et ambiguë (18). L'appareil de l'invention comprend une table de rotation (104) sur laquelle est monté le radar, un contrôleur (106) de table de rotation qui commande le positionnement de l'altimètre radar, un réflecteur (122) et une unité d'étalonnage (128). Le réflecteur réfléchit et collimate l'énergie radar (124) dirigée vers l'altimètre radar en provenance de la source radar. L'unité d'étalonnage reçoit un angle (108) en provenance du contrôleur, indiquant une position de l'altimètre radar par rapport à l'énergie radar collimatée, et un angle mesuré (126) en provenance de l'altimètre radar. L'unité d'étalonnage calcule une correction (72) sur la base des différences entre l'angle reçu en provenance de la table de rotation et l'angle mesuré reçu en provenance de l'altimètre, et transmet la correction d'étalonnage à l'altimètre.

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