Wideband RF characterization setup with high dynamic range low frequency measurement capabilities

2016 ◽  
Author(s):  
Sebastian Gustafsson ◽  
Christian Fager ◽  
Koen Buisman ◽  
Mattias Thorsell
Keyword(s):  
Dynamic Range ◽  
Low Frequency ◽  
High Dynamic Range ◽  
Frequency Measurement ◽  
High Dynamic ◽  
Measurement Capabilities

scholarly journals Galactic neutral hydrogen and the magnetic ISM foreground

2017 ◽  
Vol 12 (S333) ◽  
pp. 146-150
Author(s):  
S.E. Clark
Keyword(s):  
Interstellar Medium ◽  
Dynamic Range ◽  
Low Frequency ◽  
Neutral Hydrogen ◽  
Depth Resolution ◽  
High Dynamic Range ◽  
Neutral Gas ◽  
High Dynamic ◽  
New Generation ◽  
The Relationship

AbstractThe interstellar medium is suffused with magnetic fields, which inform the shape of structures in the diffuse gas. Recent high-dynamic range observations of Galactic neutral hydrogen, combined with novel data analysis techniques, have revealed a deep link between the morphology of neutral gas and the ambient magnetic field. At the same time, an observational revolution is underway in low-frequency radio polarimetry, driven in part by the need to characterize foregrounds to the cosmological 21-cm signal. A new generation of experiments, capable of high angular and Faraday depth resolution, are revealing complex filamentary structures in diffuse polarization. The relationship between filamentary structures observed in radio-polarimetric data and those observed in atomic hydrogen is not yet well understood. Multiwavelength observations will enable new insights into the magnetic interstellar medium across phases.

scholarly journals High dynamic range, Interferences Tolerant, Digital Receivers for Radioastronomy: Results and Projects at Paris and Nanay Observatory

2002 ◽  
Vol 199 ◽  
pp. 506-507
Author(s):  
Carlo Rosolen ◽  
Alain Lecacheux ◽  
Eric Gerard ◽  
Vincent Clerc ◽  
Laurent Denis
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Block Diagram ◽  
Low Frequency ◽  
Parallel Architecture ◽  
Digital Signal ◽  
High Dynamic Range ◽  
Dsp System ◽  
High Dynamic ◽  
Digital Receivers

Radio astronomy in the decameter to centimeter wavelength range is facing new challenges because of man made interferences due to increasing needs in telecommunications. At the Radioastronomy department of Paris Meudon Observatory, we have been working since four years on high dynamic range digital receivers based on Digital Signal Processors (DSP). The first achievement is a digital spectro- polarimeter devoted to spectroscopy of astrophysical radiation in decameter range, now in operation at the Nancay Decameter array. The block diagram of the receiver includes a high dynamic range analogue section followed by a 12 bits analogue to digital converter. The digital part makes use of high power, programmable digital circuits for signal processing, arranged in a dedicated parallel architecture, able to compute in real time the power spectrum and the correlation of the input signals. This receiver was also used, as spectrometer backend, at Nancay decimetric radiotelescope and has performed very well in the presence of very strong interferences. We are presently working on a new digital receiver with broader bandwidth. The objective is 2 × 25 MHz band with at least 60 dB dynamic range. This new receiver will use additional computation power in order to recognise and avoid man made interferences which corrupt the radio astronomical signal. At the Nancay Radioastronomy Observatory, we have started to develop a new digital configurable receiver with 8 times 25 MHz band and ten thousand channels. For low frequency radioastronomy, direct spectrum computation technique is really powerful and offers new capabilities for real time interferences excision. Fig. 1 shows pulsar observations in the presence of interference made with the DSP receiver on the UTR-2 radiotelescope. Fig. 2 shows the effect of satellite interfernce on OH observations made with the Nancay telescope. Fig. 3 shows the block diagram of the DSP system and demonstrates how offline excision of interference in the frequency time-domain enables recovery of the signal. The final spectrum had 960 minutes integration on and off source and took 8045 minutes of procession on a 450 MHz Pentium II.

Robust Analog Canceller for High-Dynamic-Range Radio Frequency Measurement

2012 ◽  
Vol 60 (6) ◽  
pp. 1709-1719 ◽  
Author(s):  
Joshua M. Wetherington ◽  
Michael B. Steer
Keyword(s):  
Radio Frequency ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Frequency Measurement ◽  
High Dynamic

High-dynamic-range interferometric bragg-cell spectrum analyser

1986 ◽  
Vol 133 (1) ◽  
pp. 26
Author(s):  
J. Mellis ◽  
G.R. Adams ◽  
K.D. Ward
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Spectrum Analyser ◽  
High Dynamic

High Dynamic Range Photography for Intraoperative Imaging: How We Do It

2011 ◽  
Vol 13 (5) ◽  
pp. 362-363 ◽  
Author(s):  
P. D. Radford ◽  
M. Rollin ◽  
K. S. Patel
Keyword(s):  
Dynamic Range ◽  
Intraoperative Imaging ◽  
High Dynamic Range ◽  
High Dynamic

High Dynamic Range Imaging

2012 ◽  
Vol 66 (9) ◽  
pp. 771-773
Author(s):  
Shoji Yamamoto
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
High Dynamic

High Dynamic Range Images and Tone Mapping Operator

2009 ◽  
Vol 35 (2) ◽  
pp. 113-122 ◽  
Author(s):  
Ke-Hu YANG ◽  
Jing JI ◽  
Jian-Jun GUO ◽  
Wen-Sheng YU
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Tone Mapping ◽  
Range Images ◽  
High Dynamic

High Dynamic Range Image Generation of Dynamic Scenes

2018 ◽  
Vol 30 (9) ◽  
pp. 1625
Author(s):  
Denghui Zhang ◽  
Yongqing Huo
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Range Image ◽  
Image Generation ◽  
High Dynamic Range Image ◽  
Dynamic Scenes ◽  
High Dynamic
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