Precise measurement device for angular deviation of canopy transparency in fighter aircraft

Abstract

The angular deviation (AD) of an aircraft cockpit transparency deteriorates the accuracy of the armament system because it introduces a difference between the actual and theoretical targets. To increase the accuracy, the AD of the transparency is measured and provided to the integrated mission-display computer as an AD coefficient. In this way, pilots can see the actual target accurately on their head-up display. To implement this mechanism, we have developed a new measurement system that automatically measures AD. This paper discusses the equations of the automatic system that measures AD, the development and operation of the system, and the verification of its accuracy and precision. The results showed that the accuracy has a maximum bias of ±0.04 mm, a percentage bias of 0.3, and a percentage linearity of 0.8 with 1% of criteria for each factor. The precision results showed a percentage contribution of dx 0.18 and dy 0.04, a percentage study variation of dx 4.24 and dy 2.08, and dx 33 and dy 67 for the number of distinct categories. These values satisfied our requirements: the percentage contribution should be less than 1, the percentage study variation less than 10, and the number of distinct categories greater than 10.