This paper describes the effectiveness and possibility of practical use about two types of visual display systems to improve the situation awareness of the pilot, when an aircraft is approaching and landing under the condition of low weather minimum.
The one of these systems, when an aircraft is on the final approach course under the condition of IMC, provides a display of simulated airport lighting to the pilot, which is just like a night view of airport lighting at visual approach. By using this system, a pilot could make approach and landing in the same feeling as a visual approach by watching this image projection on the cockpit front windshield whatever any weather condition.
The second one, display the runway contour on the airborne weather radar scope by radar reflectors which are installed on the ground along runway lights of the airport. By using this system, a pilot could easily find the airport on the radar scope and approach in the same feeling as a visual approach.
These two types of visual display systems are very effective as systems to supersede the conventional precision approach and to use as a monitor of automatic landing system.