Showing papers on "Collision avoidance system published in 1977"

Collision avoidance system of aircraft

Abstract: A collision avoidance system for aircraft using an on-board beacon interrogator. If altitude information is not included in a response signal from a transponder of an other aircraft or the response signal is garbled because a plurality of other aircraft are responding to the same interrogation signal, the system automatically switches to a beacon based proximity warning system and indicates the distance or other indication to the detected aircraft.

Surveillance system for collision avoidance of aircrafts using radar beacon

Abstract: A collision avoidance system using on-board B-CAS equipment having an object to minimize interference with the ground SSR stations and to effect precise tracking or distance-altitude measurement when necessary. Normally passive surveillance is made to detect the presence of other aircraft in the B-CAS range. Active surveillance is added when required. In the active surveillance mode, initiated on locating an intruder aircraft, the power and interrogation signal are varied when the intruder aircraft becomes a threat aircraft to minimize interference with the ground SSR stations and aircraft outside the threat zone while maintaining accuracy of detection and tracking of the threat aircraft at a high level.

Initial collision avoidance algorithms for the beacon-based collision avoidance system

Abstract: This document describes a set of baseline collision avoidance algorithms which can be used as a point of departure for the development of final algorithms for the FAA's Beacon-based Collision Avoidance System (BCAS). The algorithms were structured to permit great flexibility in an experimental environment such as NAFEC. They incorporate a number of selectable options in the collision avoidance logic and in the display output. One option permits the selection of either a passive mode logic or an active mode logic. When the passive mode is selected, other options allow horizontal positive or negative commands to be used. In addition, the display of positive or negative commands can be selected or suppressed, and limit vertical rate commands can be selected for display independently of positive or negative commands. Two types of Intruder Position Data (IPD)-flashing IPD's and ordinary IPD's-can also be selected for display. The logic can drive three types of cockpit displays namely, an ACAS display, a baseline IPC display, and a general purpose Plan View Display (PVD). (Author)

Human collision avoidance behavior as a function of visibility traffic density, electronic aiding and type of information displayed

Abstract: Licensed Captains of 80,000 DWT oil tankers were tested on a real time computerized simulator in order to evaluate their collision avoidance behavior in the open sea. Visibility, Traffic density, Navigational aid, and Type of information displayed were manipulated experimentally in order to assess the effects of these variables upon the human's performance in potential collision situations. The findings indicated that a computerized collision avoidance system greatly reduced the danger of collision in poor visibility and in high traffic density whereas the possibility of collision was increased using radar in poor visibility and high traffic density. Furthermore, it was found that a meaningful graphic display of information was responsible for the improved performance as compared to a visual alphanumeric display of target ship information.