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.

Development of a collision avoidance system with automatic brake control

Abstract: This paper describes a collision avoidance system, which avoids a collision with pedestrians on the road as well as the preceding vehicle caused by inadvertent human errors. The system uses automatic emergency braking. The system is comprised of four key technological elements: headway distance measurement using scanning laser radar, path estimation algorithm with vehicle dynamics, collision prediction to the preceding vehicle by safety/danger decision algorithm, and longitudinal automatic brake control. (A) For the covering abstract see IRRD 868006.

Collision avoidance of Smart UAV in multiple intruders

Abstract: Collision avoidance of UAV is an important function required from pilots and traffic controller as it intends to fly in the airspace of manned aircraft. It is implemented into Smart UAV which the flight test for automatic take-off, conversion and mission flight was conducted successfully last year. Prior to flight test for collision avoidance, the hardware-in-the-loop simulation (HILS) test is conducted in order to verify system operation and avoidance algorithm. Intruders are simulated through virtual aircraft models on the ground and transmitted to digital flight control computer (DFCC). The detection and avoidance algorithm is implemented to the operational flight program (OFP) in DFCC. This paper gives the description for the configuration of collision avoidance system, HILS system and the result for the simulation test in the case of multiple intruders.

Strengthening the Power Supply System of Electrified Railways, Taking into Account the Use of Interval Control Devices

Abstract: The technical means and technologies aimed at strengthening the traction power supply system, are considered in this work, namely a Railway Collision Avoidance System of train traffic with a centralized equipment arrangement when using rail circuits without insulating joints, which is promising from the point of view of qualitatively improving operational, technical and economic indicators, and works in conjunction with the scheme of organizing the movement of connected trains on the basis of “virtual coupling”, which are increasingly being used both on the railways of Russia and on foreign railways. The features of building such systems on one of the main trips of the country are analyzed. The principle of organizing the movement when using a system based on moving block sections is described. The technologies exclude the additional time spent on the formation of heavy and connected trains, the loss of time during overtaking in the event of a malfunction of the rolling stock along the route is significantly reduced, and an increase in the throughput of sections through the introduction of new Railway Collision Avoidance Systems allows reducing the intervals of passing trains to 3–6 minutes. A comparative assessment of the application of a modern Railway Collision Avoidance System, formed according to the principle of “virtual coupling” and “rigid” coupling, with the use of the Fazonord software and computing complex is made. The model of the power supply system of the railway section is presented. The necessity of additional strengthening of the traction power supply system with longitudinal compensation devices and voltage regulation under load on traction transformers is shown.

Performance Evaluation of IEEE 802.11a MAC Protocol for Vehicle Intersection Collision Avoidance System

Abstract: Vehicle-to-vehicle (V2V) communications network is a subclass of mobile ad hoc networks (MANET). With the new dedicated short range communications (DSRC) at 5.9 GHz, vehicles equipped with DSRC devices will communicate and collaborate to broadcast their safety-critical information to each other. DSRC is to be used in a wide range of advanced vehicle safety applications such as intersection collision avoidance system. The DSRC specification is based on the physical (PHY) and medium access control (MAC) layers of the IEEE 802.11a. The MAC mechanism for the IEEE 802.11a is the distributed coordination function (DCF), which is based on carrier sense multiple access with collision avoidance (CSMA/CA). Mobile nodes contend for the channel using a DCF random backoff timer. A random backoff algorithm chooses a Contention Window (CW) value between aCWmin and aCWmax. The random number, CW, is the number of time slots the mobile node has to sense the channel idle before it may transmit. In this paper, we developed an intersection traffic simulator to evaluate the settings of IEEE 802.11a DCF aCWmax on the available bandwidth per vehicle and on the required communication range. Our simulation results show that it is sufficient to set the aCWmax to 200 and the communication range to 200m for the intersection collision avoidance system enabled by DSRC.