Showing papers on "Collision avoidance system published in 1968"
Patent•
16 Sep 1968TL;DR: In this article, a cooperative collision avoidance system is proposed to synchronize the clock without addressing within a cooperative system, which utilizes the time slot of the aircraft requesting synchronization during its time slot.
Abstract: A means of synchronizing clocks without addressing within a cooperative collision avoidance system which utilizes the time slot of the aircraft requesting synchronization. During its time slot, an aircraft transmitting a collision avoidance message automatically requests clock synchronization. All other aircraft within the collision avoidance network which receive the synchronization request will respond in a random manner with a probability inversely proportional to the number of potential responding aircraft within the collision avoidance network. To accomplish this each cooperating aircraft is equipped to monitor the number of occupied time slots so as to determine the number of potential responding aircraft, determines the probability of its response with respect thereto and determines in accordance with the probability thus derived whether it should respond to this particular synchronization request.
6 citations
TL;DR: A collision avoidance system (CAS) has been the goal of the airlines for more than a decade as mentioned in this paper, and both technology and a detailed understanding of the problem developed to a point where a system could be defined.
Abstract: A collision avoidance system (CAS) has been the goal of the airlines for more than a decade. Both technology and a detailed understanding of the problem developed to a point where a system could be defined. A CAS system using stable time and frequency technology has been defined as a result of the joint effort of the airlines and selected manufacturers. The result of these efforts is presented.
3 citations
TL;DR: In this article, the collision avoidance synchronization system provides a method by which over 1000 aircraft can be accommodated in a 250-mile radius, where information is exchanged at a data rate of once every 3 seconds.
Abstract: The collision avoidance synchronization system provides a method by which over 1000 aircraft can be accommodated in a 250-mile radius. Information is exchanged at a data rate of once every 3 seconds. Master-time synchronization permits one-way ranging between aircraft with an rms range error of less than 120 feet (36.6 meters) when both use the same master. A maximum error of less than 1000 feet (304.8 meters) rms between two aircraft occurs when each is tied back to a different master and each is at the limits of a hierarchy air-to-air synchronization extension system. An asynchronous backup mode of operation is provided to permit system operation in low-density areas beyond coverage of the master system time.
2 citations
TL;DR: The Airline Air Traffic Control Committee CAS Technical Working Group has prepared a technical description of an airborne collision avoidance system in block diagram form with the major functional blocks and signal flow discussed as mentioned in this paper.
Abstract: The Airline Air Traffic Control Committee CAS Technical Working Group has prepared a technical description of an airborne collision avoidance system. This ATA system is presented in block diagram form with the major functional blocks and signal flow discussed. The ``minimum system'' discussed in the technical description and some anticipated optional additions to the air-carrier system are included in the discussion. A brief examination of some of the factors taken into account in the air-carrier power budget is also included.
1 citations