Searched for: author:"Rajan, R.T."
(1 - 10 of 10)
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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
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Bentum, M. J. (author), Verma, M. K. (author), Rajan, R.T. (author), Boonstra, A. J. (author), Verhoeven, C.J.M. (author), Gill, E.K.A. (author), van der Veen, A.J. (author), Falcke, H. (author), Wolt, M. Klein (author), Monna, B. (author), Engelen, S. (author), Rotteveel, J. (author), Gurvits, L. (author)
The past two decades have witnessed a renewed interest in low frequency radio astronomy, with a particular focus on frequencies above 30 MHz e.g., LOFAR (LOw Frequency ARray) in the Netherlands and its European extension ILT, the International LOFAR Telescope. However, at frequencies below 30 MHz, Earth-based observations are limited due to a...
journal article 2020
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Rajan, R.T. (author), Ben-Maor, Shoshana (author), Kaderali, Shaziana (author), Turner, Calum (author), Haken, Dawn (author), Vedant, Gary Paul (author), Melograna, Catrina (author), Salmeri, Antonino (author), Cohen, Jacob (author)
Earth's magnetosphere is vital for today's technologically dependent society. The energy transferred from the solar wind to the magnetosphere triggers electromagnetic storms on Earth, knocking out power grids and infrastructure | e.g., communication and navigation systems. Despite occurring on our astrophysical doorstep, numerous physical...
conference paper 2020
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Karunanithi, Visweswaran (author), Rajan, R.T. (author), Sundaramoorthy, P.P. (author), Verma, Maneesh (author), Verhoeven, C.J.M. (author), Bentum, M (author), McCune, E.W. (author)
The inter-satellite link (ISL) in swarm and constellation missions is a key enabler in the autonomy of the mission. OLFAR (Orbiting Low Frequency Array for Radio astronomy) is one such mission where 10 to 50+ nanosatellites are placed in the Lunar orbit and perform astronomical observations from the far-side of the moon. Each of the...
conference paper 2019
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Rajan, R.T. (author), Sundaramoorthy, P.P. (author), Vertegaal, C.J.C. (author), Montagne, A.J.M. (author), Karunanithi, V. (author), Verma, Maneesh (author), Bentum, M (author), Verhoeven, C.J.M. (author)
The frequency range between 0.3 and 30 MHz remains one of the last unexplored frequency ranges in radio astronomy. However, Earth-based observations at these wavelengths are severely impeded, due to man-made radio frequency interference (RFI) and atmospheric opacity. To overcome this impediment, various space-based radio astronomy studies have...
conference paper 2019
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Rajan, R.T. (author), Leus, G.J.T. (author), van der Veen, A.J. (author)
The estimation of the coordinates of nodes their proximity (or distance) measurements, is a principal challenge in numerous fields. Conventionally, when localizing a static network of immobile nodes, non-linear dimensionality reduction techniques are applied on the measured distances to obtain the relative coordinates up to a rotation and...
journal article 2019
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Kazaz, T. (author), Rajan, R.T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)
Achieving high resolution time-of-arrival (TOA) estimation in multipath propagation scenarios from bandlimited observations of communication signals is challenging because the multipath channel impulse response (CIR) is not bandlimited. Modeling the CIR as a sparse sequence of Diracs, TOA estimation becomes a problem of parametric spectral...
conference paper 2019
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Rajan, R.T. (author)
doctoral thesis 2016
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Rajan, R.T. (author), Boonstra, A.J. (author), Bentum, M. (author), Klein-Wolt, M. (author), Belien, F. (author), Arts, M. (author), Saks, N. (author), Van der Veen, A.J. (author)
The past decade has seen the advent of various radio astronomy arrays, particularly for low-frequency observations below 100 MHz. These developments have been primarily driven by interesting and fundamental scientific questions, such as studying the dark ages and epoch of re-ionization, by detecting the highly red-shifted 21 cm line emission....
journal article 2015
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Rajan, R.T. (author), Van der Veen, A.J. (author)
Synchronization and localization are critical challenges for the coherent functioning of a wireless network of mobile nodes. In this paper, a novel joint non-linear range and affine time model is presented based on two way time stamp exchanges, extending an existing affine time-range model. For a pair of nodes, a closed form pairwise least...
conference paper 2013
Searched for: author:"Rajan, R.T."
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