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Politi, Elena (author), Purucker, Patrick (author), Larsen, Morten (author), Reis, Ricardo J. Dos (author), Rajan, R.T. (author), Penna, Sergio Duarte (author), Boer, Jan-Floris (author), Rodosthenous, Panagiotis (author), Dimitrakopoulos, George (author), Varlamis, Iraklis (author), Höß, Alfred (author)Unmanned Aerial Systems (UAS) have rapidly gained attraction in recent years as a promising solution to revolutionize numerous applications and meet the growing demand for efficient and timely delivery services due to their highly automated operation framework. Beyond Visual Line of Sight (BVLOS) operations, in particular, offer new means of...journal article 2024
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Mohammadkarimi, M. (author), Leus, G.J.T. (author), Rajan, R.T. (author)A new method for joint ranging and Phase Offset (PO) estimation of multiple drones/aircrafts is proposed in this paper. The proposed method employs the superimposed uncoordinated Automatic Dependent Surveillance-Broadcast (ADS-B) packets broadcasted by drones/aircrafts for joint range and PO estimation. It jointly estimates range and PO prior...journal article 2024
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Li, Z. (author), Rajan, R.T. (author)Affine formation control of multiagent systems has recently received increasing attention in various applications. The distributed control of these agents, under single integrator dynamics, relies on the observations of relative positions of the neighboring agents, which when unavailable is detrimental to the mission. In this paper, we...conference paper 2023
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Diab, Mosab (author), Mohammadkarimi, M. (author), Rajan, R.T. (author)In this paper, we study path planning algorithms of resource constrained mobile agents in unknown cluttered environments, which include but are not limited to various terrestrial missions e.g., search and rescue missions by drones in jungles, and space missions e.g., navigation of rovers on the Moon. In particular, we focus our attention on...conference paper 2023
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Tang, Rui (author), Riemens, E.H.J. (author), Rajan, R.T. (author)Multi-agent networks are known for their scalability, robustness, flexibility, and are typically tasked with a variety of tasks such as target tracking, surveillance, traffic control, and environmental monitoring. Distributed Particle Filters (DPF) are often employed when the for non-linear parameter estimation with non-Gaussian noise. In this...conference paper 2023
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Zhai, P. (author), Rajan, R.T. (author)Gaussian Process (GP) is a flexible non-parametric method which has a wide variety of applications e.g., field estimation using multi-agent systems. However, the training of the hyperparameters suffers from high computational complexity. Recently, distributed hyperparameter optimization with proximal gradients has been proposed to reduce...conference paper 2023
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Zhai, P. (author), Rajan, R.T. (author)Distributed multi-agent systems (MAS) offer higher robustness and scalability compared to single-agent systems employing centralized solutions. The challenge of learning unknown environmental phenomenons can be regarded as learning a hidden function, which can be modeled through non-parametric methods e.g., Gaussian Processes (GP). Our main...conference paper 2022
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Mishra, A. (author), Rajan, R.T. (author)For a network of mobile nodes, the problem of estimation of relative kinematics, given pairwise distances between the nodes, has received limited attention in literature. In this context, relative kinematics includes relative position, relative velocity and other higher order kinematic parameters defined with respect to a common frame of...conference paper 2022
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Li, Z. (author), Rajan, R.T. (author)Multiagent systems have been widely researched and deployed in the industry for their potential to collectively achieve goals by distributing tasks to individual agents [1]–[4]. Formation control, one of the many applications of multiagent systems, aims at steering agents into a stable geometric pattern in space [3], [4]. There has been a...conference paper 2022
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YANG, X. (author), Sun, Junzi (author), Rajan, R.T. (author)Automatic Dependent Surveillance - Broadcast (ADS-B) is a surveillance technology that is used extensively in Air Traffic Control (ATC) applications. Aircraft equipped with ADS-B transponders actively broadcast navigation information such as position, altitude, and velocity, and thus ATC is able to track aircraft continuously, even in regions...conference paper 2022
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Aledo Ortega, D. (author), Manjunath, T. (author), Rajan, R.T. (author), Maksimiuk, Darek (author), van Leuken, T.G.R.M. (author)In multi-sensor systems, several sensors produce data streams, commonly, at different frequencies. If they are let running wild without synchronization, after a period of time, they are likely to be disordered, presenting as simultaneous measures that have been recorded at different times. That can be disastrous in many data fusion applications....conference paper 2022
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Riemens, E.H.J. (author), Rajan, R.T. (author)Detect-and-avoid is a crucial challenge in the autonomous navigation of single or multiple agent systems. For safe and reliable autonomous navigation in unknown and dynamic environments, obstacles should be sensed using onboard sensors and the trajectory should be adjusted accordingly. Additional challenge is introduced in the case of multi...conference paper 2022
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Turner, C.J. (author), Rajan, R.T. (author)Large satellite constellations in Low Earth Orbit (LEO) have the potential to revolutionise worldwide internet access. The concomitant potential of these large constellations to impact space sustainability, however, has prompted concern from space actors as well as provoking concern in the ground-based astronomy community. Increasing the...conference paper 2022
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Abel, Felix (author), Ferent, Cristian (author), Sundaramoorthy, P.P. (author), Rajan, R.T. (author)This decade has seen growing interest in Mars exploration. Advances in distributed systems, miniaturization and commoditization of space electronics and innovations in communications permit us to rethink the current paradigm of relying on a few heavy, slow and expensive high-tech rovers for Mars surface exploration. In this work, we address the...conference paper 2022
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Abel, Felix (author), Sundaramoorthy, P.P. (author), Rajan, R.T. (author)Recently, an increase in distributed space systems and a rise in number of nodes in such systems is observed in numerous space applications, for example space-based interferometry. Such applications pose stringent demands on time synchronization which can be challenging to achieve for satellite networks that lack an absolute time reference...conference paper 2022
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van der Marel, M.P. (author), Rajan, R.T. (author)Formation control (FC) of multi-agent systems plays a critical role in a wide variety of fields. In the absence of absolute positioning, agents in FC systems rely on relative position measurements with respect to their neighbors. In distributed filter design literature, relative observation models are comparatively unexplored, and in FC...conference paper 2022
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Zeng, Yikai (author), Wang, M. (author), Rajan, R.T. (author)Coordination for truck platooning refers to the active formation of a group of heavy-duty vehicles traveling at close spacing to reduce the overall truck operations costs. Conventionally, this coordination is achieved by optimizing various truck-related parameters, such as schedules, velocities, and routes, based on an objective function that...journal article 2022
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Rajan, R.T. (author), Ben-Maor, Shoshana (author), Kaderali, Shaziana (author), Turner, Calum (author), Milhim, Mohammed (author), Weppler, Johannes (author), Bunt, Riccardo (author), Jaber, Dina Saad Fayez (author), Nguyen, Anh (author)Earth's magnetosphere is vital for today's technologically dependent society. To date, numerous design studies have been conducted and over a dozen science missions have flown to study the magnetosphere. However, a majority of these solutions relied on large monolithic satellites, which limited the spatial resolution of these investigations,...journal article 2022
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Mishra, A. (author), Rajan, R.T. (author)Given a network of N static nodes in D-dimensional space and the pairwise distances between them, the challenge of estimating the coordinates of the nodes is a well-studied problem. However, for numerous application domains, the nodes are mobile and the estimation of relative kinematics (e.g., position, velocity and acceleration) is a...conference paper 2022
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Gurvits, L. (author), Falcke, Heino (author), Frey, Sándor (author), Fromm, Christian M. (author), García-Miró, Cristina (author), Janssen, Michael (author), Masania, K. (author), Rajan, R.T. (author), Visser, P.N.A.M. (author)Ultra-high angular resolution in astronomy has always been an important vehicle for making fundamental discoveries. Recent results in direct imaging of the vicinity of the supermassive black hole in the nucleus of the radio galaxy M87 by the millimeter VLBI system Event Horizon Telescope and various pioneering results of the Space VLBI...journal article 2022
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