导弹寻的器中使用的单模式传感器有时会受假目标的影响。为了降低虚警率,人们研制出了采用毫米波和红外两种传感器的双模式寻的器。本发明则提供一种三模式寻的器。它包括一个激光跟踪器、一个毫米波发射器/接收器和一个红外探测器。毫米波发射器/接收器位于主反射器的焦点处。毫米波能量的通路中有一个经过有选择地镀膜的二向色元件,该二向色元件将来自主反射器的红外能量反射到一个光学系统,该光学系统再将红外能量重新成像在红外探测器上。主反射器的外缘或边缘是变形的,这样,入射的激光能量便可以聚焦在远离毫米波发射器/接收器的一 Single-mode sensors used in missile seekers are sometimes subject to false targets. In order to reduce the false alarm rate, people have developed a dual-mode seeker using both millimeter wave and infrared sensors. The present invention provides a three-mode look-up. It includes a laser tracker, a millimeter wave transmitter / receiver and an infrared detector. The millimeter wave transmitter / receiver is located at the focal point of the main reflector. The millimeter-wave energy path has a selectively coated dichroic element that reflects the infrared energy from the primary reflector to an optical system that re-images the infrared energy into the infrared detector on. The outer edge or edge of the main reflector is distorted so that the incident laser energy can be focused away from the millimeter wave transmitter / receiver