Four Years of Realtime GRB Followup by BOOTES-1B (2005-2008)

Four years of BOOTES-1B GRB follow-up history are summarised for the first time in the form of a table. The successfully followed events are described case by case. Further, the data are used to show the GRB trigger rate in Spain on a per-year basis, resulting in an estimate of 18 triggers and about 51 h of telescope time per year for real time triggers. These numbers grow to about 22 triggers and 77 h per year if we include also the GRBs observable within 2 hours after the trigger.Comment: 16 pages, Accepted into Proceedings of AstroRob Malaga 200

Optical Camera Communications for IoT–Rolling-Shutter Based MIMO Scheme with Grouped LED Array Transmitter

In optical camera communications (OCC), the provision of both flicker-free illumination and high data rates are challenging issues, which can be addressed by utilizing the rolling-shutter (RS) property of the image sensors as the receiver (Rx). In this paper, we propose an RS-based multiple-input multiple-output OCC scheme for the Internet of things (IoT) application. A simplified design of multi-channel transmitter (Tx) using a 7.2 × 7.2 cm2 small 8 × 8 distributed light emitting diode (LED) array, based on grouping of LEDs, is proposed for flicker-free transmission. We carry out an experimental investigation of the indoor OCC system by employing a Raspberry Pi camera as the Rx, with RS capturing mode. Despite the small area of the display, flicker-free communication links within the range of 20–100 cm are established with data throughput of 960 to 120 bps sufficient for IoT. A method to extend link spans up to 1.8 m and the data throughput to 13.44 kbps using different configurations of multi-channel Tx is provided. The peak signal-to-noise ratio of ~14 and 16 dB and the rate of successfully received bits of 99.4 and 81% are measured for the shutter speeds of 200 and 800 µs for a link span of 1 m, respectively

The First Study of MIMO Scheme Within Rolling-shutter Based Optical Camera Communications

In this paper, we propose the first study of MIMO (multiple-input multiple-output) scheme using a simplified design of MIMO transmitter (Tx) based on grouping of light-emitting diodes (LED) within an array for flicker-free transmission in optical camera based communications (OCC) link. We carried out an initial experimental investigation of indoor static downlink OCC using a Raspberry Pi camera as the receiver with rolling-shutter capturing mode and a 7.2 cm × 7.2 cm small 64-neopixel LED array as the Tx. The initial study suggests that, despite the small area of the display, communication links from 20 up to 60 cm can be established

Design, Manufacturing, and Commissioning of BIRCAM (Bootes InfraRed CAMera)

This paper covers the various aspect of design, manufacturing and commissioning of the infrared camera BIRCAM, installed at BOOTES-IR, the 60 cm robotic infrared telescope at Sierra Nevada Observatory (OSN, Granada, Spain). We describe how we achieved a quality astronomical image, moving from the scientific requirements

Statika tenkostennych skorepinovych konstrukci.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Posouzeni priciny poruchy kombinovaneho menice SSVAS 123/3G na rozvodne E25/R110 v poli c.01 pro T101.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

A SIMO Hybrid Visible Light Communication System for Optical IoT

International audienceVisible light communications (VLC) is an emerging technology utilizing light emitting diodes and photodetectors (PDs) and cameras (i.e., image sensors (ISs)) as the transmitter and receivers (Rx), respectively for simultaneous data communications, illumination, localization and sensing in indoor optical Internet of Things. We propose, a single-input multipleoutput (SIMO) hybrid VLC system using PD-and IS-based Rxs for simultaneous high-and low-speed (i.e., Rb-High and Rb-Low) data transmission. In addition, we propose amplitude overlapping AOL in the modulation format to increase the Rb and reduce the attenuation due to high-pass filter effect of the bias-T. We experimentally evaluate the performance of the proposed scheme considering the inter-link impacts. Results show that, at AOL of 0-0.2, (i) the measured bit error rate for the PD-based VLC is below the forward error correction limit of 3.8×10-3 for Rb-Low of 2.5 and 5 kb/s at Rb-High of 35 and 60 Mb/s, respectively; and (ii) for the ISbased VLC link with the camera gain of 4 dB and Rb-High of up to 70 Mb/s, the reception success rates are > 96 and 90 % at Rb-Low of 2.5 and 5kb/s, respectively

Design and testing of a Kirkpatrick-Baez optics variation

Beside Wolter I X-ray optics, which are used at most in currently operating X-ray space telescopes, there exist also other optical designs and their usability for space observations is still the matter of studies. This article covers preliminary testing results of an optical module which is based on a modified Kirkpatrick-Baez optics. This X-ray optics, consisting of four sub-modules, was assembled in Prague and tested at the PANTER test facility of MPE afterward. The sub-modules use different reflective coatings, in part developed by our research group, on complementary flat mirrors, which approximate the shape of a Kirkpatrick-Baez optical design. In this contribution we summarise the design of the optical modules, the details of applied coating layers, and the X-ray characterisation results at the PANTER test facilit

Optical Camera Communication System for Internet of Things based on Organic Light Emitting Diodes

International audienceThe inclusion of organic light emitting diodes (OLEDs) in high-end devices, such as TVs and smart-phones, along with the insertion of cameras embedded in daily use devices, provides the opportunity to establish optical camera communication (OCC) systems based on OLED emitters for Internet of Things (IoT). This Letter presents an experimental demonstration of this OLED-based OCC system for IoT. The results suggest that despite the low emitted power of OLED devices, long range links can be established based on OCC. One outdoor and two indoor scenarios are tested, validating BER below 10 -6 for short range and give just 3.56×10 -3 for long range links