Airborne Pointing and Tracking Systems Open Port Design and Modification Analysis

摘要

The Open Port modification to the Airborne Pointer Tracker (APT) system makes possible system operation without a sealed aperture window. This is accomplished by a protective shroud that prevents direct airstream impingement on critical internal turret components and a porous aperture aerofence that reduces acoustical coupling of the turret cavity to the airstream. An extensive instrumentation of the Open Port components has been accomplished. Data obtained will include dynamic pressure, static pressure, temperature and structural stress. The instrumentation signals are conditioned by a compact turret mounted, electronic amplifier before they are delivered to the recording system of the Airborne Laser Laboratory (ALL) aircraft. A general description of the physical and operational characteristics of the Open Port modification is provided in the following text. The design analyses undertaken as part of the modification work task directive and the resultant conclusions are also provided. (Author)