Analysis of alerting performance for detect and avoid of unmanned aircraft systems

2018 Aviation Technology, Integration, and Operations Conference

et al. 2018

This paper presents a process for selecting candidate Detect-and-Avoid Well Clear definitions for Unmanned Aircraft Systems and non-cooperative aircraft. The selection is based on considerations of the unmitigated collision risk, maneuver initiation range, and others. Operational assumptions related to low cost, size, weight, and power sensors equipped by the Unmanned Aircraft Systems are applied to set the scope of aircraft performance and drive metrics computation. Four candidate Well Clear definitions, two primary and two secondary, varying from 1500 to 2500 ft in their horizontal miss distance and from 0 to 25 sec in modified tau, are selected for future analyses.

Section: Introductionmentioning

confidence: 99%

Well Clear Trade Study for Unmanned Aircraft System Detect And Avoid with Non-Cooperative Aircraft

2018 Aviation Technology, Integration, and Operations Conference

et al. 2018

“…A DAA system provides surveillance, alerts, and maneuver guidance to keep a UAS "well clear" of other aircraft [1,2]. In the United States, simulation tests as well as flight tests have provided supporting information for defining a DAA Well Clear [1,3] (DWC) and requirements for the alerting and maneuver guidance performance [4][5][6][7][8]. Prototype DAA algorithms have also been developed for alerting and maneuver guidance (referred to as guidance in this paper) research [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Detect and Avoid Alerting Performance with Limited Surveillance Volume for Non-Cooperative Aircraft

AIAA Scitech 2019 Forum

2019

This paper investigates effects of limited surveillance volume on the alerting performance of a Detect and Avoid (DAA) system for unmanned aircraft systems (UAS). The surveillance volume accounts for an airborne sensor capable of detecting non-cooperative aircraft. Independent variables include four candidate DAA Well Clear (DWC) definitions and five surveillance volumes. Open-loop alerting performance metrics are computed from the results of running a reference DAA algorithm on a large number of synthesized encounters. The speed range for the UAS traffic considered is between 40 and 100 kts. Results show that, with a 2.5 nmi sensor range, all four candidate DWCs allow at least an average of 25 seconds warning alert times before a loss of DWC. Cumulative distributions of the intruder's bearing and elevation at the first warning alert suggest that ±10 • and ±140 • , respectively, are sufficient for alerting > 95% of the encounters that lead to losses of DWC.

“…A DAA system provides surveillance, alerts, and maneuver guidance to keep a UAS "well clear" of other aircraft [1,2]. In the United States, simulation tests as well as flight tests have provided supporting information for defining a DAA Well Clear [1,3] (DWC) and requirements for the alerting and maneuver guidance performance [4][5][6][7][8], on which surveillance requirements were derived and based. The parameters used to define DWC are explained in more detail in section II of this paper.…”

Section: Introductionmentioning

confidence: 99%

Detect-and-Avoid Alerting Performance for High-Speed UAS and Non-Cooperative Aircraft

AIAA Aviation 2019 Forum

2019

This paper investigates the alerting timeline and required surveillance volume for four candidate Detect and Avoid (DAA) Well Clear (DWC) definitions for Unmanned Aircraft Systems (UAS) and non-cooperative visual flight rules (VFR) traffic. The candidates are proposed in previous work that analyzed unmitigated collision risks and maneuver initiation ranges for UAS carrying low cost, size, weight, and power radar and that fly with true airspeeds under 100 kts. This analysis extends the maximum UAS true airspeed from 100 kts to 291 kts. Overall, the results from this paper suggest that the smaller DWC definitions do not adversely affect average alerting times. Among the candidate DWC's examined, DWC2 has the potential of reducing the surveillance range requirement the most while maintaining the same alerting timeline. DWC2 is defined as a cylinder with a horizontal radius of 2,200 feet and a vertical range of 450 feet above and below the UAS.