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.

Relative position-based collision avoidance system for swarming uavs using multi-sensor fusion

Abstract: This paper presents the development of a quadrotor unmanned aerial vehicle (UAV) that is capable of quaddirectional collision avoidance with obstacles in swarming applications through the implementation of relative positionbased cascaded PID position and velocity controllers. A collision avoidance algorithm that decides evasive manoeuvres in two dimensional flight by the means of net error calculation was developed. Sensor fusion of ultrasonic (US) and infrared (IR) sensors was performed to obtain a reliable relative position data of obstacles which is then fed into collision avoidance controller (CAC) for generating necessary response in terms of attitude commands. Flight tests performed proved the capability of UAV to avoid collisions with the obstacles and dummy non-flying UAVs that existed at a closer distance in its four primary directions of detections during flight successfully.

Encounter Analysis to Support Detect, Sense, and Avoid (DSA) Elevation Field of Regard (FOR) Requirements

Abstract: Widespread integration of Unmanned Aircraft Systems (UAS) in the National Airspace System (NAS) continues to be hindered by the inability to meet “see and avoid” requirements stated in Title 14 of the Code of Federal Regulations (CFR). Ongoing efforts by standard development organizations are attempting to establish performance standards that will ultimately lead to development of Federal Aviation Administration (FAA) certifiable Detect, Sense, and Avoid (DSA) systems. Previous efforts have also attempted to define UAS collision avoidance system performance requirements necessary for operating in the NAS at a level of safety equivalent to that of a manned aircraft. Although several of these efforts actually proposed values for sense and avoid performance parameters, most of these values were based solely upon the CFR regulations for manned aircraft or the specifications for existing traffic advisory systems such as TCAS. One of the performance parameters defined in recent studies is sensor Field of Regard (FOR) - the volume of airspace that must be surveyed in order to detect other aircraft that may pose a collision threat. The values proposed in these studies go beyond references to the regulations and are based on a study conducted by NASA specifically for high-altitude, long-endurance UAS. That study assumed a head-on encounter between two aircraft in level flight and recommended a volume of +/-15 degree elevation and +/-110 degree azimuth. Although these FOR values may be valid for the assumed conditions, they do not account for maneuvering aircraft or aircraft on a similar course. Additional in-depth analysis of encounters is necessary to establish quantitative values required for field of regard standards that provide a sufficient basis for system certification. The primary measure of effectiveness for this analysis was the percentage of conflicting traffic within the UAS sensor’s elevation FOR. Given representative flight parameter ranges for the UAS and conflicting traffic, the methodology uses statistical distributions to randomly generate multiple collision encounters and determine the conflicting aircraft’s relative azimuth and elevation. This methodology can, therefore, provide a realistic assessment of FOR coverage capability necessary for determination of DSA system requirements. The results from this study indicate that a +/-15 degree elevation requirement may not be sufficient for all potential collision geometries and flight conditions. This study has resulted in the development of a methodology that can play an important role in determining collision avoidance system’s performance necessary to achieve the required level of safety while avoiding over-stating requirements which could delay DSA system development.

Active accelerated collision avoidance control method and device and controller

Abstract: The invention provides an active accelerated collision avoidance control method and device and a controller and relates to the technical field of vehicles. The active accelerated collision avoidance control method comprises the steps of obtaining rear perception data of the vehicle, wherein the rear perception data comprises a relative speed and a distance between a rear object and the vehicle; calculating an estimated collision time in real time according to the rear perception data; when the estimated collision time is less than a preset collision avoidance threshold, judging whether a running area is in front of the vehicle or not; and if so, transmitting an acceleration control signal to a power module control unit so that the vehicle is accelerated to avoid collision. According to theactive accelerated collision avoidance control method and device and the controller, TTC judgement of the rear direction can be made by using the existing perception capability; and as a rear activecollision avoidance capability is increased on the basis of the existing collision avoidance system, the user experience is improved, the active collision avoidance capability of a preceding vehicle under a condition of a rear-end collision is improved, and the function increasing and expansion are realized.

Collision avoidance method and system for a trailer aircraft of an aircraft formation relative to an intruder aircraft

Abstract: A collision avoidance method and system for a trailer aircraft of an aircraft formation relative to an intruder aircraft. The collision avoidance system is embedded in a trailer aircraft of an aircraft formation and it is intended to avoid a collision relative to at least one aircraft external to the aircraft formation, called intruder aircraft, the aircraft formation including a lead aircraft and the at least one trailer aircraft, the collision avoidance system being configured to bring the trailer aircraft to a safety point dependent on a safety zone, prior to the implementation of an avoidance maneuver, the safety zone corresponding to a zone located to the rear of the lead aircraft and with no wake turbulence generated by the lead aircraft.