Towards More Autonomy for Unmanned Vehicles: Situational Awareness and Decision Making under Uncertainty

Lead Research Organisation: Loughborough University
Department Name: Aeronautical and Automotive Engineering

Abstract

It is anticipated that unmanned vehicles will be widely used within military and civilian operations and have a profound influence in our daily life in near future. Before fully realising the potential that unmanned vehicles bring, it is reasonably expected that to make unmanned vehicles accepted by users, the public and regulatory authorities, they shall achieve a similar level of safety as human operated systems. Among many others, a fundamental requirement for an unmanned vehicle is the capability to respond to internal and external changes in a safe, timely and appropriate manner. Therefore, situational awareness and decision making are two of the most important enabling technologies for safe operation of unmanned vehicles. To a large extent, they determine the level of autonomy and intelligence of an unmanned vehicle. Compared with a human driver or pilot residing in the vehicle, a major safety concern is the inevitable reduction in situational awareness of the unmanned vehicle operator remotely located in a control station.

Unmanned vehicles operate in a dynamic, unpredictable environment with incomplete (or inaccurate) sensory information, which creates many challenges in situational awareness and decision making. Probabilistic and bounded approaches are widely used to represent uncertainty with a known distribution or with a known upper and lower bounds respectively. Situational awareness includes the perception of the objects in the environment within a volume of time and space, the comprehension of their meaning and the projection of their status in the near future. For example, in projection of the near status of moving objects of interest, any initial uncertainty associated with perception and comprehension will expand exponentially with the increase of the projection time span. However, it is possible to significantly reduce the uncertainty by utilising the information in the world model such as the operation environment, the Rules of the Road (or of the Air) and the properties of an identified object. For probabilistic uncertainty, this makes the Gaussian distribution assumption invalid, which is fundamental for most of the current statistical approaches such as Kalman filtering. Under the Gaussian distribution assumption, the estimated state about a moving object can be presented by its mean with a variance, and a symmetric uncertain region can be defined with the mean located at the centre (under a specified confidence level such as 99%). The introduction of knowledge (e.g. constraints due to the roadway layout) makes this not true anymore. To address the challenge of non-Gaussian distributions imposed by making use of information from the world model, a rigorous Bayesian learning framework will be developed for pooling all the knowledge from the world model and measurement data to provide a better estimate of the environment, and to propagate the uncertain regions with projection time. Reachability analysis will be developed for bounded uncertainty for worst case analysis, where the uncertainty will be reduced using constraints from the world model. Hazard analysis will be carried out to identify any potential risk. The key idea is to take a proactive approach to prevent any emergent situation through improving situational awareness reasoning and decision making. The estimates and associated uncertain region provided by the situational awareness will be fed to novel decision making and planning tools. The research activities will be strongly supported and verified by experimental tests on small scale ground and aerial vehicles. This project aims to significantly improve the level of safety of unmanned vehicle operation and to bridge the gap between the development and deployment of unmanned vehicles in real world applications, which is a strategically important area for new business growth.

Planned Impact

Although unmanned vehicles have the potential to provide huge benefit to the economy, end users and the society, they do impose unprecedented challenges as they are in an uncharted area. Among other concerns such as legal issues and ethics, safety is a paramount consideration for a wide application of unmanned vehicles. In Afghanistan, on 13th Sept., 2009, the American Air Force was forced to shoot down one of its own MQ-9 Reaper aircraft that did not go into failsafe mode after the service lost remote control of the aircraft, and license for patrolling along the Mexico border was suspended by the Federation Aviation Authority (FAA) for a short time due to safety issues.

This Autonomous and Intelligent Systems Programme is to respond to the imperative needs of fundamental research in this emerging business area, backed by an industrial consortium consisting of companies that share the same vision but may have different business interests. Although there is a wide spectrum of unmanned vehicles, each with different operational environments/needs, all the unmanned vehicles face the same challenge, i.e. operating in a dynamic and unpredictable environment. This project aims to tackle the fundamental issues faced by the industrials by improving situational awareness and decision making in a dynamic and uncertain environment so to improve the safety in operating unmanned vehicles. Therefore, all the UK industrials with business interests in unmanned vehicles, in particular the partners, will directly benefit from this project.

The outcomes of this proposed project will assist regulatory authorities to formulate their policies for the operation of unmanned vehicles, helping them to understand the behaviour of unmanned vehicles and the risks and safety issues caused by increasing the level of autonomy. The situational awareness and hazard analysis functions developed in this project will help end users and unmanned vehicles operators to determine proper levels of autonomy in response to the change of real operation scenarios. The public will benefit from a better understanding about the true risk involved in using unmanned vehicles, and the reduced risk due to better onboard situational awareness and decision making functions (e.g. unmanned vehicles will less likely become a hazard to the public). In the long term, the situational awareness and decision making techniques developed in this proposal will help to develop other autonomous systems such as domestic support, health care or other service robots. This would improve quality of life and health care by providing domestic support for society and providing health care for disabled and elderly people living at home.

The academic community will be able to take the results generated by this project to identify new research directions. This project identifies and addresses a number of new academic challenges, for example, non-Gaussian distributions arising from situational awareness in autonomous and intelligent systems, and comprehension, projection and hazard analysis for unmanned vehicles. This project takes a true multi-disciplinary effort in tackling these challenges, which will promote interdisciplinary collaboration and cross-fertilise in a number of areas, e.g. mathematics/statistics, autonomous/intelligent systems, transport, computational intelligence and safety engineering. It supports and contributes to the wider academic community of unmanned vehicles in the UK and worldwide, where further academic research in the relevant areas will ultimately lead a pathway towards economic/societal impact as highlighted above. The public and other interested parties (non-academic) will be informed about the results of this project via the project web site, newsletters and media reports through Lougborough University's Public Relations Office.
 
Description A framework based on Bayesian inference has been developed for situation awareness of unmanned vehicles. It is able to incorporate priori information such as maps, geological information systems and traffic rules into onboard sensor measurement to support the safe operation of unmanned vehicles in a complicated uncertain and dynamic environment. the framework is implemented through newly developed particle filtering algorithms.

Bu working with BAE Systems, the proposal framework has been applied to develop two key autonomous functions for unmanned aircraft operation: forced landing for unmanned aircraft, and autonomous taxiing in aerodrome. After the algorithms are designed and implemented, these functions have been first tested in a synthetic simulation environment and then part of the functions have been demonstrated through small scale UAV flight tests.
Exploitation Route It is our intention to carry on working with BAE Systems to further refine and develop these important autonomous functions to enable UAV safety operation in civilian airspace.

We are also exploring opportunities to bring our findings of the general framework about situation awareness and decision making under uncertainty into intelligent or driverless vehicles area. We have discussed with a few companies including JLR and Nissan. We are also invited to present our framework on several workshops in autonomous vehicles area to attract possible partners to take the work forward. We have now worked with SME in developing autonomous agri robots using the navigation and safety functions developed in this project.
Sectors Aerospace, Defence and Marine,Digital/Communication/Information Technologies (including Software),Healthcare,Transport

 
Description ASUR
Amount £40,000 (GBP)
Funding ID 1014_C1_PH1_028 
Organisation Defence Science & Technology Laboratory (DSTL) 
Sector Public
Country United Kingdom
Start 03/2015 
End 09/2015
 
Description Autonomous Bayesian search for hazardous sources. CDE Autonomy in hazardous scene assessment competition
Amount £50,000 (GBP)
Funding ID ACC 101517 
Organisation Defence Science & Technology Laboratory (DSTL) 
Sector Public
Country United Kingdom
Start 01/2017 
End 06/2017
 
Description Autonomous Search for Chemical Release with a pocket-sized Drone; Phase II Autonomy in Hazardous Scene Assessment
Amount £375,000 (GBP)
Organisation Defence Science & Technology Laboratory (DSTL) 
Sector Public
Country United Kingdom
Start 10/2017 
End 09/2018
 
Description Autonomous landing of a helicopter at sea: advanced control in adverse conditions (AC2)
Amount £100,000 (GBP)
Funding ID EP/P012868/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Academic/University
Country United Kingdom
Start 03/2017 
End 06/2018
 
Description EPSRC/Dstl UDRC
Amount £437,908 (GBP)
Funding ID EP/K014307/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Academic/University
Country United Kingdom
Start 04/2013 
End 03/2018
 
Description Enabling wide area persistent remote sensing for agriculture applications through developing and coordinating heterogenous platforms
Amount £1,000,000 (GBP)
Funding ID ST/N006852/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Academic/University
Country United Kingdom
Start 05/2016 
End 04/2019
 
Description Innovate UK: Jiangsu-UK Industrial Challenge Programme; AgriRobot: Autonomous agricultural robot system for precision spraying
Amount £840,000 (GBP)
Funding ID Project Number 104016 
Organisation Innovate UK 
Sector Public
Country United Kingdom
Start 03/2018 
End 02/2020
 
Description Persistence through Reliable Perching
Amount £200,000 (GBP)
Funding ID EP/R005494/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Academic/University
Country United Kingdom
Start 03/2017 
End 02/2018
 
Description BAE Systems AISP 
Organisation BAE Systems
Department BAE Systems Military Air & Information
Country United Kingdom 
Sector Private 
PI Contribution Based on the informaiton provided by the BAE Systems, we have defined autonomous taxiing and terminal area operation for unmaned aircraft systems. After fully reviewing the problems and related work, a number of new methods have been developed including predicting the location of other aircraft with specified level of confidence and combing maps and other informaiton with camera observation for nagivation and safety assessment in autonomous taxiing.
Collaborator Contribution BAE Systems has regular meetings with the Team working at Loughborough and has appointed two technical officers working with us. Guidance on the problem formulation and real operation constraints have been provided. Assessment and feedback of the research progress have regularly made by BSE Systems. BAE Systems also helped to set up the research link with Virtual Engineering Centre at Liverpool for research colalborations in this area. Several data sets using virtual simulation environment have been collected and provided to Loughboorugh Team for algorithm development. In the summer of 2015, BAE Systems has conducted various filed tests and collected data from an airfield for the project.
Impact New situational awareness algorithms for terminal area operation of unmanned aircraft systems have been developed and the corresponding simulator has been developed. These algorithms have been implemented in the simulator and demonstrated to BAE Systems. This lays out the further work in this area for improving the accuracy and reducing uncertainty of the predicting the behaviours of other airspace users. The work is of multidisciplinary nature and is the combinations of aerospace and computer science.
Start Year 2012
 
Description Autonomous systems theme meeting 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Professional Practitioners
Results and Impact This event is open for all the industrial companies particularly Defenec sectors for improving their awareness of and understanding progess in autonomous system related technologies. As a Co-Chair, I was involved in organising the theme meeting and gave a presentation. It triggers a good level of discussion.

Industrial companies and technical officers and advisors in Defence Science and Technology Laboratory (Dstl) have a better understanding of the recent progress in autonomous system technologies cross a number of sectors (air, land, naval).
Year(s) Of Engagement Activity 2014