-H
Ft3
1
Ft3/sec1
s
R-F2
~
Valve Area Figure 2. Functional Block Diagram of a Liquid Level Process.
(to be continued in next issu~)
*---*---*
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GLOSSARY OF TERMS
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COMPUTERS AND AUTOMATION
• Over 480 terms defined
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• 4th cumulative edition, as of Sept. 19, 1956
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---News Release
Am TRAFFIC CONTROL SYSTEM Bendix Pacific Division North Hollywood, Calif.
A fully developed navigation system and a po-tential air traffic control system is now available to handle the rapidly growing use of today's air-ways, according to representatives of Pacific Div-ision, Bendix Aviation Corporation, in North Holly-wood, Calif. This system, known as the Bendix-Decca Navigator System (see Figures 1 and 2)*, was first developed in Great Britain by two Americans
and was first used in the Normandy invasion. It is now in current use in most of the European are a and covers over two million square miles of land and sea area.
The system is of the area coverage type and operates on low frequency radio waves in the range of 100 KC. The use of this low frequency transmis-sion provides a system which is usable behind hills, in valleys, beyond line-of-sight and below the cur-vature of the earth. Good reception and high accur-acy is provided from ground level to the highest al-titudes, thus making the system ideal for helicopter as well as fixed-wing use.
The Bendix-Decca System operates by trans-missions from a master station and three slave stations. The master controls the accurate emis-sion of radio waves from the slave stations which results in a network pattern of hyperbolic w a v e s which occupy precisely known and stable geographic positions. The location of the airc~aft is, of course, basically determined by making a phase comparison of the signals from two of the transmitting stations.
The system provides a position fix by deriving the arbitrary index numbers on an appropriate pair of ordinates which intersect at the point of position.
With this information the position can be automat-ically and instantaneously displayed on a c h art through the medium of a moving ink stylus.
U sing the Bendix-Decca System, an air track for lateral separation can be assigned
to
each air-craft and the pilot will be able to change altitude while flying an assigned track without running the risk of interference with other aircraft. In th e cockpit the pilot has a pictorial display which ac-curately plots the flight course at all times. The pilot thus has continuous, precise and graphic in-formation as to his present location, direction of flight, and track.32
-This system will expedite landing procedures by having aircraft approach the airport on parallel tracks separated at minimum intervals. App-roaches can be made more quickly and safely by using the Bendix-Decca System, according to Ben-dix-Pacific engineers. Knowing the exact time of arrival, traffic flow in the terminal area can be handled much more expeditiously which, in turn, will eliminate long periods of awaiting clearance for landing. These waiting periods !ll'e particular-ly hazardous for turboprop and turbojet powered aircraft because of the excessive consumption of fuel at low altitudes.
The Bendix-Decca System is extremely accur-ate and, in fact, has accuracies of better than 25 yards under normal conditions at distances of up to 50 miles from transmitting stations. The Ben-dix-Decca System is designed for short and med-ium range navigation, although a similar system, called Dectra, has also been developed for long range use. The pilot, with one set of receiving equipment aboard his aircraft, could use the Ben-dix-Decca System after take off and during app-roach to his terminal area,and Dectra while flying at his selected crltising altitude.
The Bendix-Decca Navigator System ~s a proved system which fully meets the requirements of the common system serving'helicopters, ships, fixed-wing aircraft and ground verhicles with equal facility. It is a fully developed system which has been proved in operation over many years and its use is constantly expanding throughout the world. The accuracy, flexibility and wide cover-age of the system, the use of the flight log to give the pilot continuous position information, flexibility of use, and safety in air traffic control systems are not approached at the present time by any other known system. con-cerned. I think this statement may well be reversed.
We have developed computing equipment of tremen-dous speed and capacity. What perplexes the com-puting industry and the Department of Defense is the sluggishness of the human spirit in partiCipating in their fundamental problems.
-
END-Air Traffic
Figure 1 - The Bendix-Decca Navigator System: reporting board.
Figure 2 - The reporting board ,as it appears in
an
airplane cockpit.33