Aleš Povalač
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View article: Characterization of more than three years of in-orbit radiation damage of SiPMs on GRBAlpha and VZLUSAT-2 CubeSats
Characterization of more than three years of in-orbit radiation damage of SiPMs on GRBAlpha and VZLUSAT-2 CubeSats Open
Silicon photomultipliers (SiPMs) are prone to radiation damage which causes an increase of dark count rate. This leads to an increase in low-energy threshold in a gamma-ray detector combining SiPM and a scintillator. Despite this drawback,…
View article: Educational PocketQube Satellite Demonstrator
Educational PocketQube Satellite Demonstrator Open
This paper presents the design of a 2P (50×50×50mm) PocketQube satellite which will be used in STEM laboratory classes. The proposed system was designed with emphasis on modularity, ease of replacement using commercial off-the-shelf compon…
View article: Exploring LoRaWAN Traffic: In-Depth Analysis of IoT Network Communications
Exploring LoRaWAN Traffic: In-Depth Analysis of IoT Network Communications Open
In the past decade, Long-Range Wire-Area Network (LoRaWAN) has emerged as one of the most widely adopted Low Power Wide Area Network (LPWAN) standards. Significant efforts have been devoted to optimizing the operation of this network. Howe…
View article: LoRaWAN Traffic Analysis Dataset
LoRaWAN Traffic Analysis Dataset Open
This dataset was created by a LoRaWAN sniffer and contains packets, which are thoroughly analyzed in the paper Exploring LoRaWAN Traffic: In-Depth Analysis of IoT Network Communications. Data from the LoRaWAN sniffer was collected in four …
View article: LoRaWAN Traffic Analysis Dataset
LoRaWAN Traffic Analysis Dataset Open
This dataset was created by a LoRaWAN sniffer and contains packets, which are thoroughly analyzed in the paper Exploring LoRaWAN Traffic: In-Depth Analysis of IoT Network Communications. Data from the LoRaWAN sniffer was collected in four …
View article: LoRaWAN Traffic Analysis Dataset
LoRaWAN Traffic Analysis Dataset Open
This dataset was created by a LoRaWAN sniffer and contains packets, which are thoroughly analyzed in the paper Exploring LoRaWAN Traffic: In-Depth Analysis of IoT Network Communications (not yet published). Data from the LoRaWAN sniffer wa…
View article: GRBAlpha: The smallest astrophysical space observatory
GRBAlpha: The smallest astrophysical space observatory Open
Aims. Since it launched on 22 March 2021, the 1U-sized CubeSat GRBAlpha operates and collects scientific data on high-energy transients, making it the smallest astrophysical space observatory to date. GRBAlpha is an in-orbit demonstration …
View article: The peak flux of GRB 221009A measured with GRBAlpha
The peak flux of GRB 221009A measured with GRBAlpha Open
Context. On 2022 October 9 the brightest gamma-ray burst (GRB) ever observed lit up the high-energy sky. It was detected by a multitude of instruments, attracting the close attention of the GRB community, and saturated many detectors. Aims…
View article: GRBAlpha: the smallest astrophysical space observatory -- Part 1: Detector design, system description and satellite operations
GRBAlpha: the smallest astrophysical space observatory -- Part 1: Detector design, system description and satellite operations Open
Aims. Since launched on 2021 March 22, the 1U-sized CubeSat GRBAlpha operates and collects scientific data on high-energy transients, making it the smallest astrophysical space observatory to date. GRBAlpha is an in-obit demonstration of a…
View article: The peak-flux of GRB 221009A measured with GRBAlpha
The peak-flux of GRB 221009A measured with GRBAlpha Open
The brightest gamma-ray burst ever observed, long-duration GRB 221009A, was detected by GRBAlpha nano-satellite without saturation. We present light curves of the prompt emission in 13 energy bands, from 80 keV to 950 keV, and perform a sp…
View article: Insights into the Issue of Deploying a Private LoRaWAN
Insights into the Issue of Deploying a Private LoRaWAN Open
The last decade has transformed wireless access technologies and crystallized a new direction for the internet of things (IoT). The modern low-power wide-area network (LPWAN) technologies have been introduced to deliver connectivity for bi…
View article: CubeSat Demonstrator for Educational Purposes
CubeSat Demonstrator for Educational Purposes Open
This paper describes the design of a CubeSat with a 1U (10x10x10 cm) size, which will be used in laboratory tasks. It includes six photovoltaic cells, mounted on the top of its mechanical construction. Cells will produce electricity to pow…
View article: Wideband UHF and SHF long-range channel characterization
Wideband UHF and SHF long-range channel characterization Open
This paper presents an outdoor long-range (from 315 m up to 5.3 km) fixed channel campaign for both ultra high frequency and super high frequency bands with co-polarized horizontal and vertical antenna configurations. It investigates the c…