Abstract
Demands for access of Unmanned Aircraft Systems (UAS) to the United States National Airspace System (NAS) continue to increase. A vital safety component of manned aircraft in the NAS is the onboard pilot’s ability to see and avoid other aircraft. UAS must possess the capability of remaining safely separated from other aircraft without an onboard pilot. Detect and Avoid (DAA) systems are needed for this purpose, but requirements for the systems have not been determined to date. To fill this gap, RTCA, Inc., Special Committee 228 (SC-228) is currently working to develop Minimum Operational Performance Standards (MOPS) for UAS that will include a proposed quantitative well-clear definition and DAA system requirements. This paper discusses a study of the sensitivity of the DAA timeline contribution of UAS maneuver performance requirements associated with the well-clear definition in the case of high-speed encounters. Initial time and range requirements derived in accordance with the quantified DAA Well Clear definition and statute speed limitations may be overly restrictive considering current on-board radar needed to detect aircraft not equipped with a transponder. In order to facilitate NAS-wide integration, a trade space analysis has been performed investigating the derivation of performance requirements based on lower, yet statistically relevant, aircraft speeds. An initial assessment of the associated risks was also investigated. Some of the results are presented herein; more detailed results were made available to SC-228.
Published Version
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