Showing papers on "Collision avoidance system published in 1975"

Multi-target tracker

Abstract: A digital tracker in a cooperative collision avoidance system utilizing time division techniques, which is capable of generating track gates and determining critical values of tau (time to collision) for at least 16 targets during the same time frame, the maximum number of targets being limited essentially by the size of the logic memory elements used and the maximum range desired.

Full range correlator for use in a collision avoidance system

Abstract: In a cooperative collision avoidance system, the reply signals to interrogation probe signals are correlated by a digital circuit that processes all the reply signals identifying targets over non-targets or "fruit." The correlator is capable of detecting all targets in any desired range during a given correlation period.

Circuit for inhibition of autogenetic false alarms in a collision avoidance system

Abstract: In a cooperative collision avoidance system, probe signals are inhibited for a predetermined time period to prevent autogenetic false alarms, that is, false replies to one's own interrogation probes.

Progress in signaling for track guided systems

Abstract: The advantages of tracked systems over nontracked systems, e.g. the case of automation, are presented. Vehicle detection and communication are critical in automatic systems because of the safety, reliability, and cost factors. Current methods of tracked vehicle detection and communication are reviewed: fixed and moving block systems, the use of crossover wires and the choice of signaling frequencies. The advantages of using high frequencies and surface electromagnetic waves are given and current high frequency methods under investigation are reviewed. Because of the high cost of installing waveguides alongside the track, an innovative method is proposed in which the track is used as a surface waveguide. A block diagram of a headway control and collision avoidance system is illustrated. The results are presented for the analysis of a rail adapted to form a waveguide and these indicate the feasibility of this idea.

Multiple target data receiver for a collision avoidance system

Abstract: In an interrogation vehicle, a receiver of data from a plurality of remote vehicles such as aircraft or maritime vessels in a cooperative collision avoidance system is arranged to receive such data reply signals in reply to interrogation signals. The reply signals are suitably coded in the remote vehicles to provide information in a predetermined plurality of sequential replies from each replying vehicle.