Collision avoidance system

About: Collision avoidance system is a research topic. Over the lifetime, 1788 publications have been published within this topic receiving 23667 citations.

Systems and methods for multi-sensor collision avoidance

Abstract: An embodiment of the present invention provides a collision avoidance system for a host aircraft comprising a plurality of sensors for providing data about other aircraft that may be employed to determine one or more parameters to calculate future positions of the other aircraft, a processor to determine whether any combinations of the calculated future positions of the other aircraft are correlated or uncorrelated, and a collision avoidance module that uses the correlated or uncorrelated calculated future positions to provide a signal instructing the performance of a collision avoidance maneuver when a collision threat exists between the host aircraft and at least one of the other aircraft.

An experimental evaluation of in-vehicle collision avoidance systems

Abstract: This report describes a simulator study in which seven candidate in- vehicle CAS (collision avoidance systems) were compared as to their effects on driving behavior in car-following situations. The use of the CAS systems studied is accompanied by behavioral changes affecting the way in which the driving task is performed. In general, the following effects seem to be associated with the availability of a CAS: 1) a change in the distribution of time headways, in particular a reduction in the occurrence of very short headways, 2) an increase in driving speed, 3) an increase in acceleration and deceleration levels and 4) an increase in time spend driving in the left land of the road.

Development of performance specifications for collisions avoidance systems for lane change crashes

Abstract: This report presents preliminary guidelines to develop an effective lane change Collision Avoidance System (CAS). These guidelines were developed, to a large part, based on the experiences from a small number of naive drivers tested on public roads with a testbed vehicle. A functional lane change CAS was implemented on the testbed utilizing today's technology. This was done to demonstrate utility and to perform realistic testing. However, the implementation described in this report is not the only acceptable one and it is certainly not the least expensive. Nevertheless, it demonstrates that an effective lane change CAS can be built today. In order to avoid lane change collisions, the lane change CAS must monitor the areas on either side of the vehicle to determine the presence of another vehicle that could interfere with a planned lane change. It must also determine if a vehicle is approaching those areas with enough relative speed to potentially be in conflict with the instrumented vehicle. Those two tasks must be accomplished in any and all driving environments. The effectiveness of the lane change CAS was estimated using drivers' errors as a surrogate for collisions. This method led to an estimate of 43% effectiveness, which is consistent with previous estimates found in the literature. Although the cost saving per vehicle is estimated to be relatively small for a lane change CAS, eliminating lane change crashes is still deemed to be a worthwhile endeavor, one that focus groups say they want and will pay for.

Pilot Non-Conformance to Alerting System Commands During Closely Spaced Parallel Approaches

Abstract: Pilot non-conformance to alerting system commands has been noted in general and to a TCAS-like collision avoidance system in a previous experiment. This paper details two experiments studying collision avoidance during closely-spaced parallel approaches in IMC, and specifically examining possible causal factors of, and design solutions to, pilot non-conformance.

Collision avoidance in UAV tele-operation with time delay

Abstract: Tele-operation of an unmanned aerial vehicle (UAV) may involve time delay due to signal transmission. This will result in poor operator performance and control difficulties. Particularly, in a tele-operation system with haptic feedback, time delay may lead to instability, which leads to unsafe tele-operation. Wave variables are often suggested as a method for increasing operator performance in a bilateral system with time delay. However, very little has been reported about effects on human-machine interactions, such as control activity and workload, when using wave variables. This paper describes a theoretical analysis of using wave variables with a collision avoidance system for UAV tele-operation with time delay. An experiment was conducted to evaluate the effectiveness of wave variables in a collision avoidance system for tele-operation with time delay in a UAV control station equipped with haptic feedback. Operator performance, safety, control activity, and workload were studied. Results indicate that wave variables can increase the performance of a collision avoidance system with presence of time delay. The amount of collisions, control activity, and workload decreased. Operator performance remained the same as with no time delay.