Far field source emulator for antenna calibration

Details Far field source emulator for antenna calibration Far field source emulator for antenna calibration

G - Physics

01

S

G01S 7/40 (2006.01) H01Q 1/42 (2006.01) H01Q 3/26 (2006.01) H01Q 19/06 (2006.01) H01Q 19/13 (2006.01) H01Q 1/28 (2006.01)

Patent

CA 2481714

A radar antenna for a guided missile is calibrated in flight using a point source of microwave radiation and a lens to emulate a far field source. The microwave source and lens fit behind a metal cap at the leading end of the radome and so do not adversely affect the radar. A variety of techniques to power the point source are disclosed, and a variety of lens arrangements are disclosed. The invention allows a radar antenna to be calibrated in flight, and so insures against mis-calibration due to aging components as well as the heat and mechanical forces associated with storage and/or launch of the missile.

Une antenne radar de missile guidé est étalonnée en vol au moyen d'une source ponctuelle de rayonnement micro-ondes et d'une lentille servant à émuler une source de champ lointain. Cette source de micro-ondes et la lentille sont situées derrière une coiffe métallique au niveau de l'extrémité avant du radôme afin de ne pas exercer d'effets négatifs sur le radar. L'invention concerne une variété de techniques d'activation de la source ponctuelle, ainsi qu'une variété de systèmes de lentilles. Elle permet d'étalonner une antenne radar en vol, ce qui permet d'éviter tout erreur d'étalonnement due à l'usure des composants ou à la chaleur et aux forces mécaniques associées au stockage et/ou au lancement du missile.

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