Sense and Avoid Concepts: Vehicle‐Based SAA Systems (Vehicle‐to‐Vehicle)

Kopřiva, Štěpán; Šišlák, David; Pěchouček, Michal

doi:10.1002/9781119964049.ch6

Cited by 3 publications

(2 citation statements)

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“…There are basically two sensor types to aid the visual contact. 3 Cooperative sensors provide the ability to sense the environment and to communicate with aircraft equipped with the same type of sensors by establishing a communication link. "Traffic Alert and Collision Avoidance System" (TCAS) 4 and "Automatic Dependent Surveillance-Broadcast" (ADS-B) 5 are the standard solutions for manned aircraft, and the later is considered a suitable one for unmanned systems.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional Guidance Filter for Autonomous Collision Avoidance

Galisteu

Almeida

2014

AIAA Guidance, Navigation, and Control Conference

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The operation of manned and unmanned aerial vehicles, over populated areas and inside non-segregated airspaces, imposes the need of coordinated flight among vehicles and with the air traffic control. In case of an eventual loss of communication with the groundbased traffic control, or lack of visual contact with another aircraft, the operator must autonomously provide safe separation and avoid the collision. While this procedure is normally employed by manned aircraft pilots, unmanned aerial vehicles currently are not able to see or detect and avoid another conflict traffic. Thus, this work presents a new method to provide three-dimensional guidance in order to perform, autonomously, collision avoidance and also to restore adequate safe separation, without any type of on-line optimization algorithms. The proposed method is analyzed through several possible encounter scenarios, showing adequate performance with little computational burden. Nomenclature χ Course, rad ∆χ Course error γ Flight path angle, rad κ Path curvature λ Longitude, rad µ Latitude, rad Ω Turn rate, rad/s ω n Natural frequency ζ Damping ratio D Horizontal distance, m D N Distance in the north direction, m D E Distance in the east direction, m D D Distance in the down direction, m D min Minimum horizontal distance D saf e Safe distance e L Lateral distance error H Vertical distance, m H min Minimum vertical distance h Altitude, m K LAT Lateral guidance gain matrix K LON Longitudinal guidance gain matrix R E Earth radius (6378137 m) R t Path turn radius T min Minimum safe TTE value V True airspeed, m/s V G Ground (horizontal) speed, m/s V Z

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Section: Introductionmentioning

confidence: 99%

“…8 The avoidance capability, also known as "Collision Detection and Resolution" (CDR), refers to the ability to predict that a conflict is likely to occur in the future and provide the resolution in the form of an evasion maneuver. 3 The literature on CDR methods is extensive, in the contexts of both manned 9 and unmanned 3 aircraft.…”

Section: Introductionmentioning

confidence: 99%