Present ATC Working Positions and Voice Switching Control System (VSCS) have been used since 1973 when an automated ATC system with FDP (Flight Data Processing System) and RDP (Radar Data Processing System) were first introduced at Japan's ACCs, and because of aging and insufficient adaptability for new ATC procedures, replacement of these equipments are planned.

Prior to this renewal, new Working Positions with Electronic Tabular Display (ETABS)/Touch Input Display (TID) and digital VSCS were studied in order to realize various ATC demands such as facilitation of operation, flexible adaptation for air traffic volume, as well as augmentation of reliability and maintenability. The results of these studies will be presented in installments.

This part 1 presents the results of mock-up simulation of ATC Working Positions where ergonomics is being applied.

In the following series, the results of comprehensive evaluation by Air Traffic Controllers, of new Working Positions with ETABS/TID and VSCS, will be discussed.

At a request of Japan Civil Aviation Bureau, new ATC Working Positions with Electronic Tabular Display (ETABS)/Touch Input Display (TID) and digital Voice Switching and Control System (VSCS) were studied in order to realize various ATC demands such as facilitation of operation, flexible adaptation for air traffic volume, as well as augmentation of reliability and maintenability. The results of these studies are being presented in installments.

In part 1, mock-up simulation of ATC Working Positions has been discussed.

This Part 2 presents new ATC Consoles such as ETABS/TID and the results of evaluation of these Consoles.

In part 3, prototype of new Working Positions with ETABS/TID and VSCS, and comprehensive evaluation by Air Traffic Controllers will be discussed.

A new method was developed to obtain garble free SSR information on aircraft identification and altitude by discriminating SSR signal from many of garbled replies.

In this new method, two replies received from different locations at the same time are necessary for discriminating garbled replies. And the positions of aircraft can be measured by using a hyperbolic navigation method. Based on this idea, a computer simulation was carried out under the several garbled conditions.

The rate of degarbled signal for one airraft, two aircraft and three aircraft, under the condition that three replies are garbled, are 97%, 74% and 34%, respectively. And the estimated error on the base line of the hyperbolic navigation method is less than 10m for about 90% of aircraft whose reply was discriminated.