Topic
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.
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Patent•
05 Nov 1993TL;DR: In this paper, a collision avoidance system for aircraft comprises a device (1) for locating the aircraft, and a database and processing circuit (2,3) for calculating a safe floor above which the aircraft must fly for each geographical location.
Abstract: The collision avoidance system for aircraft comprises a device (1) for geographically locating the aircraft, and a database and processing circuit (2,3) for calculating a safe floor above which the aircraft must fly for each geographical location. A further circuit (4) is able to predict the location of the aircraft between one given time and the next, and a comparison circuit is able to compare the predicted position with the safe floor value. The safe floor which is used for comparison is consolidated by use of a sensor (7) which detects obstacles with the local area. A circuit (8) measures the height of any such obstacles w.r.t. the safe floor and modifies the information regarding the safe height at which the aircraft must fly.
15 citations
01 Jan 1997
TL;DR: It was estimated that this minimum AHS vehicle penetration ranged from 5 to 30% of the total vehicle population depending on many factors such as number of lanes already existing in the corridor, frequency of entry and exit lanes, and average trip distance.
Abstract: In the Precursor Systems Analyses (PSA) sponsored by the Federal Highway Administration in 1993, several of the researchers addressed how AHS would be first introduced to the market. The researchers identified several problems to be overcome including driver acceptance and the ability of state and regional departments of transportation to operate and maintain an AHS.(1–3) The researchers concluded that one of the most serious issues is the “chicken-or-egg” problem—which comes first, the AHS highway lanes or the AHS-equipped vehicles? Minimum AHS vehicle penetration for a particular corridor or highway segment is reached when, after conversion of one of the existing highway lanes to AHS, the number of AHS lane users equals the number of manual users of the lane before conversion. It was estimated that this minimum AHS vehicle penetration ranged from 5 to 30% of the total vehicle population depending on many factors such as number of lanes already existing in the corridor, frequency of entry and exit lanes, and average trip distance.
15 citations
Patent•
21 Oct 1970TL;DR: A frequency diversity time multiplex (FDTM) is a cooperative collision avoidance system where the carrier frequency of transmissions in adjacent time slots is varied stepwise on a predetermined schedule as mentioned in this paper.
Abstract: A frequency diversity time multiplex means for increasing the capacity of a cooperative collision avoidance system wherein the carrier frequency of transmissions in adjacent time slots is varied stepwise on a predetermined schedule.
15 citations
TL;DR: An advanced emergency braking control system is studied by taking into account the pedestrians and the vehicles, and results display that the designed controller has a good response in preventing colliding with the front vehicle or pedestrian.
Abstract: Automotive collision avoidance system, which aims to enhance the active safety of the vehicle, has become a hot research topic in recent years. However, most of the current systems ignore the active protection of pedestrian and other vulnerable groups in the transportation system. An advanced emergency braking control system is studied by taking into account the pedestrians and the vehicles. Three typical braking scenarios are defined and the safety situations are assessed by comparing the current distance between the host vehicle and the obstacle with the critical braking distance. To reflect the nonlinear time-varying characteristics and control effect of the longitudinal dynamics, the vehicle longitudinal dynamics model is established in CarSim. Then the braking controller with the structure of upper and lower layers is designed based on sliding mode control and the single neuron PID control when confronting deceleration or emergency braking conditions. Cosimulations utilizing CarSim and Simulink are finally carried out on a CarSim intelligent vehicle model to explore the effectiveness of the proposed controller. Results display that the designed controller has a good response in preventing colliding with the front vehicle or pedestrian.
14 citations
22 Nov 2010
TL;DR: The collision avoidance behaviour in a recursive nested behaviour control structure for Unmanned Aerial Vehicles is discussed and the formulation of a repulsion forces based on radar sensor measurement is presented.
Abstract: In this paper, the collision avoidance behaviour in a recursive nested behaviour control structure for Unmanned Aerial Vehicles will be discussed. The architecture is an extension of the behaviour-based recursive control structure, which has been applied successfully to mobile robot applications. The system structure, as an abstraction of multiple cascaded control loops with feedback mechanisms, is robust against disturbances and model uncertainties. The obstacle awareness and collision avoidance are considered to be the most important issues in the field of Unmanned Aerial Vehicles (UAV), thus more attention will be paid to this topic. The collision avoidance utilizes a potential field method tailored for UAV application domain. The formulation of a repulsion forces based on radar sensor measurement is presented. The implementation of the collision avoidance system is also described.
14 citations