Detect, Sense, and Avoid

2011 ◽  
pp. 137-154
Author(s):  
Lisa Elliott ◽  
Jeremy Schwark ◽  
Matthew Rambert
Keyword(s):  
Sense And Avoid

Flight Testing of a Right-of-Way Compliant ADS-B-based Miniature Sense and Avoid System

2012 ◽  
Author(s):  
Kyle Foerster ◽  
Michael Mullins ◽  
Naima Kaabouch ◽  
William Semke
Keyword(s):  
Flight Testing ◽  
Sense And Avoid ◽  
Right Of Way

A Vision-based Solution to Estimating Time to Closest Point of Approach for Sense and Avoid

2021 ◽  
Author(s):  
Tanya Glozman ◽  
Anthony Narkawicz ◽  
Ishay Kamon ◽  
Franco Callari ◽  
Amir Navot
Keyword(s):  
Sense And Avoid

Stereospecific 1,3-H Transfer of Indenols Proceeds via Persistent Ion-Pairs Anchored By NH···Pi Interactions

2018 ◽  
Author(s):  
David Ascough ◽  
Fernanda Duarte ◽  
Robert Paton
Keyword(s):  
Computational Analysis ◽  
Ion Pairs ◽  
Ion Pair ◽  
Hydrogen Atom Transfer ◽  
Polar Solvents ◽  
Chirality Transfer ◽  
Activation Barriers ◽  
Sense And Avoid ◽  
Phase Dynamics ◽  
Pi Interactions

The base-catalyzed rearrangement of arylindenols is a rare example of a suprafacial [1,3]-hydrogen atom transfer. The mechanism has been proposed to proceed via sequential [1,5]-sigmatropic shifts, which occur in a selective sense and avoid an achiral intermediate. A computational analysis using quantum chemistry casts serious doubt on these suggestions: these pathways have enormous activation barriers and in constrast to what is observed experimentally, they overwhelmingly favor a racemic product. Instead we propose that a suprafacial [1,3]-prototopic shift occurs in a two-step deprotonation/reprotonation sequence. This mechanism is favored by 15 kcal mol<sup>-1</sup> over that previously proposed. Most importantly, this is also consistent with stereospecificity since reprotonation occurs rapidly on the same p-face. We have used explicitly-solvated molecular dynamics studies to study the persistence and condensed-phase dynamics of the intermediate ion-pair formed in this reaction. Chirality transfer is the result of a particularly resilient contact ion-pair, held together by electrostatic attraction and a critical NH···p interaction which ensures that this species has an appreciable lifetime even in polar solvents such as DMSO and MeOH.

Candidate regions extraction of intruder airplane under complex background for vision-based sense and avoid system

2017 ◽  
Vol 11 (5) ◽  
pp. 571-580 ◽  
Author(s):  
Zhouyu Zhang ◽  
Yunfeng Cao ◽  
Meng Ding ◽  
Likui Zhuang ◽  
Weiwen Yao ◽  
...  
Keyword(s):  
Sense And Avoid ◽  
Complex Background ◽  
Candidate Regions

scholarly journals Infrared and Visible Airborne Targets Image Fusion with Applications to Sense and Avoid

2020 ◽  
Vol 53 (2) ◽  
pp. 14742-14747
Author(s):  
Zhouyu Zhang ◽  
Youmin Zhang ◽  
Yunfeng Cao ◽  
Meng Ding
Keyword(s):  
Image Fusion ◽  
Sense And Avoid

scholarly journals LIDAR obstacle warning and avoidance system for unmanned aerial vehicle sense-and-avoid

2016 ◽  
Vol 55 ◽  
pp. 344-358 ◽  
Author(s):  
Subramanian Ramasamy ◽  
Roberto Sabatini ◽  
Alessandro Gardi ◽  
Jing Liu
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Sense And Avoid ◽  
Aerial Vehicle

Regulatory and Technology Survey of Sense-and-Avoid for UAS

2007 ◽  
Author(s):  
Douglas Marshall ◽  
Benjamin Trapnell ◽  
Julio Mendez ◽  
Brian Berseth ◽  
Richard Schultz ◽  
...  
Keyword(s):  
Sense And Avoid

Flight Test of a Radar-Based Tracking System for UAS Sense and Avoid

2013 ◽  
Vol 49 (2) ◽  
pp. 1139-1160 ◽  
Author(s):  
Domenico Accardo ◽  
Giancarmine Fasano ◽  
Lidia Forlenza ◽  
Antonio Moccia ◽  
Attilio Rispoli
Keyword(s):  
Tracking System ◽  
Flight Test ◽  
Sense And Avoid

Overview of Path-Planning and Obstacle Avoidance Algorithms for UAVs: A Comparative Study

2018 ◽  
Vol 06 (02) ◽  
pp. 95-118 ◽  
Author(s):  
Mohammadreza Radmanesh ◽  
Manish Kumar ◽  
Paul H. Guentert ◽  
Mohammad Sarim
Keyword(s):  
Path Planning ◽  
Comparative Study ◽  
Operating Conditions ◽  
Computational Time ◽  
Safe Operation ◽  
Sense And Avoid ◽  
Planning Algorithms ◽  
And Control ◽  
Global And Local ◽  
Further Development

Unmanned aerial vehicles (UAVs) have recently attracted the attention of researchers due to their numerous potential civilian applications. However, current robot navigation technologies need further development for efficient application to various scenarios. One key issue is the “Sense and Avoid” capability, currently of immense interest to researchers. Such a capability is required for safe operation of UAVs in civilian domain. For autonomous decision making and control of UAVs, several path-planning and navigation algorithms have been proposed. This is a challenging task to be carried out in a 3D environment, especially while accounting for sensor noise, uncertainties in operating conditions, and real-time applicability. Heuristic and non-heuristic or exact techniques are the two solution methodologies that categorize path-planning algorithms. The aim of this paper is to carry out a comprehensive and comparative study of existing UAV path-planning algorithms for both methods. Three different obstacle scenarios test the performance of each algorithm. We have compared the computational time and solution optimality, and tested each algorithm with variations in the availability of global and local obstacle information.

Sign in / Sign up

Export Citation Format

Share Document