| 摘要 |
<p>PURPOSE:To prevent passive antenna detection by reducing the reflective cross- sectional area by using an antenna reflective mirror composed of a blade structure having an interval slightly smaller than half wavelength and automatically rotating the reflective mirror so that the polarization plane of the external electric waves is intersected orthogonally with the metal blade. CONSTITUTION:The radio waves from a transmitter 1 are radiated from a primary radiator 8 through DFF rotation couplers 2, 3, a mirror axis rotation coupler 4, transceiver switch 5 and a monopulse coupler 7 and converged by a subreflector 9 and a main reflector mirror 10 so as to irradiate a target. The reflected waves are monopulse tracking signals that are conveyed through reflector mirrors 9, 10, the primary radiator 8, the coupler 7, the switch 5, mixers 12a-12c and IF preamplifiers 14a-14c. Signals are also transmitted through an IF amplifier 15, a detector 16, an adjudicator 17 and a comparator 18 to a servo circuit 19 and a servomotor 20. The reflective mirror is rotated by the rotation of the motor 20. as the blade 23 of the reflective mirror 20 reaches a position perpendicular to the polarization plane of the external electrical waves, the reception power becomes minimum and the motor 20 ceases in operation.</p> |
