Searched for: collection%253Air
(1 - 20 of 24)

Pages

List view
Grid view
document
Saathof, R. (author), Speretta, S. (author), Guo, J. (author), Kuiper, J.M. (author), Gill, E.K.A. (author)
Laser satellite communications provides an attractive application for optical communications. It provides more bandwidth with improved security at potentially a lower cost due to reduced size weight and power (SWAP) and reduced license cost compared to radio frequencies (RF) communications. These advantages have been recognized for years and...
abstract 2021
document
Mok, S. (author), Guo, J. (author), Gill, E.K.A. (author), Rajan, R.T. (author)
Orbiting Low Frequency Array for Radio Astronomy (OLFAR) is a radio astronomy mission that has been studied since 2010 by several Dutch universities and research institutes. The mission aims at producing sky maps by collecting cosmic signals at ultra-low wavelengths regimes, below the 30 MHz frequency band. A satellite swarm comprising more than...
conference paper 2020
document
Mok, S. (author), Guo, J. (author), Gill, E.K.A. (author), Rajan, R.T. (author)
Employing a satellite swarm for radio astronomy has been continuously addressed in the Orbiting Low Frequency ARray (OLFAR) project. A 100 km diameter of aperture array constructed by distributed satellites will be able to provide sky maps of better than 1 arc-minute spatial resolution at 10 MHz. However, an orbit design strategy for the...
conference paper 2020
document
Carvajal Godínez, J. (author), Guo, J. (author), Gill, E.K.A. (author)
Bus saturation is deemed as one of the primary causes of delays in the data propagation between spacecraft components. However, the conditions under which bus congestion can affect measurements variability were not well characterized before. This paper presents a bus saturation model and a set of experiments to characterize the bus...
journal article 2019
document
Zhu, L. (author), Guo, J. (author), Gill, E.K.A. (author)
Induction-based reaction spheres have been presented in many references and their performances are normally investigated through experiments or numerical simulations which are time-consuming. Here, an analytical way is presented and it enables researchers to evaluate a new design quickly. In this article, the presented performance analysis is...
journal article 2019
document
Coppola, Mario (author), Guo, J. (author), Gill, E.K.A. (author), de Croon, G.C.H.E. (author)
In this paper we present a procedure to automatically design and verify the local behavior of robots with highly limited cognition. All robots are: anonymous, homogeneous, non-communicating, memoryless, reactive, do not know their global position, do not have global state information, and operate by a local clock. They only know: (1) the...
journal article 2019
document
Coppola, M. (author), Guo, J. (author), Gill, E.K.A. (author), de Croon, G.C.H.E. (author)
This work proposes PageRank as a tool to evaluate and optimize the global performance of a swarm based on the analysis of the local behavior of a single robot. PageRank is a graph centrality measure that assesses the importance of nodes based on how likely they are to be reached when traversing a graph. We relate this, using a microscopic...
journal article 2019
document
Zheng, Z. (author), Guo, J. (author), Gill, E.K.A. (author)
This paper presents an onboard autonomous mission re-planning system for Multi-Satellites System (MSS) to perform onboard re-planing in disruptive situations. The proposed re-planning system can deal with different potential emergency situations. This paper uses Multi-Objective Hybrid Dynamic Mutation Genetic Algorithm (MO-HDM GA) combined...
journal article 2018
document
Chaves Jimenez, A. (author), Guo, J. (author), Gill, E.K.A. (author)
In this work the extent to which orbit and attitude sensors may cross-support each other in a joint processing to reduce estimation errors of the relative orbital and attitude dynamics is investigated. In order to do this, an engineering dynamic model taking into account the coupling effects between orbit and attitude dynamics is exploited...
journal article 2018
document
Zhu, L. (author), Guo, J. (author), Gill, E.K.A. (author)
In recent years, the increasing need in small satellite solutions triggers the miniaturization of attitude control systems. Reaction spheres were proposed as promising replacements of conventional reaction wheels for their 4π rotations. Since the generated control torques could be about any desired axes, a single reaction sphere is sufficient...
journal article 2018
document
Shan, M. (author), Guo, J. (author), Gill, E.K.A. (author)
journal article 2018
document
Speretta, S. (author), Pérez Soriano, T. (author), Bouwmeester, J. (author), Carvajal Godínez, J. (author), Menicucci, A. (author), Watts, T.G. (author), Sundaramoorthy, P.P. (author), Guo, J. (author), Gill, E.K.A. (author)
<b>In the last two decades, CubeSats have changed the perception of satellite missions aided by standardization and usage of commercial-off-the-shelf components. CubeSats have also proven the feasibility of low cost and short development time space missions. The PocketQube with a form factor of 5x5x5 cm has been...
conference paper 2016
document
Chu, J. (author), Guo, J. (author), Gill, E.K.A. (author)
This paper presents closed-form solutions for the problem of long-term satellite relative motion in the presence of J2 perturbations, and introduces a design methodology for long-term passive distance-bounded relative motion. There are two key ingredients of closed-form solutions.One is the model of relative motion; the other is the Hamiltonian...
journal article 2015
document
Sun, R. (author), O'Keefe, K. (author), Guo, J. (author), Gill, E. (author)
This paper proposes a precise and fast direction of arrival estimation method using Global Navigation Satellite System (GNSS) carrier phase measurements. Single-epoch, single-satellite integer cycle ambiguities are reliably resolved by making use of constraints and taking advantages of antenna arrays. The algorithm shows good robustness in cases...
journal article 2013
document
Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D.C. (author)
Precision formation flying missions require formation acquisition and maintenance through the interactions among spacecraft by the inter-satellite communication and relative navigation. This paper analyses the dedicated system constraints of the network architecture for precision formation flying missions. The critical time issue and the...
journal article 2012
document
Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D. (author)
Precise formation flying (PFF) missions require formation acquisition and maintenance through interactions among spacecraft by inter-satellite communication and relative navigation. That requires the network architecture to satisfy dedicated system constraints of time-criticality for updating navigation measurements and flexibility for...
conference paper 2011
document
Guo, J. (author), Yao, W. (author), Gill, E. (author)
The design of Distributed Space Systems (DSSs) is a challenging task, especially in the conceptual design stage where unknown or uncertain information extensively exist. This paper investigates the problem of designing DSSs in the presence of uncertainties. The uncertainties associated with DSSs are discussed. It is shown that DSSs are...
conference paper 2010
document
Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author)
Challenges and opportunities of wireless sensor networks (WSNs) in space applications are presented. The investigation of internet protocols, ad hoc routing and commercial-off-the-shelf (COTS) wireless communication protocols for efficient and reliable network design is addressed. In order to facilitate the analysis, several application...
conference paper 2010
document
Guo, J. (author), Yao, W. (author), Gill, E.K.A. (author)
The problem of new attributes and the induced uncertainties has been extensively discussed in this paper. The methodology of uncertainty multidisciplinary design optimization has also been extended to spacecraft conceptual design in the presence of new attributes. The application of this methodology on fractionated spacecraft indicates that the...
conference paper 2010
document
Osuman, A. (author), Guo, J. (author), Gill, E.K.A. (author)
Several industries are involved in the development of distributed systems, testbeds are needed to simulate the real world challenges that face the distributed systems. Presently, there are a number of testbeds in the world with very distinctive characteristics. Delft University of Technology is involved in the development of distributed space...
conference paper 2010
Searched for: collection%253Air
(1 - 20 of 24)

Pages

List view
Grid view