نتایج جستجو برای: digital radio
تعداد نتایج: 401333 فیلتر نتایج به سال:
LOPES was the radio extension of the KASCADE-Grande particle-detector array consisting of up to 30 antennas measuring the radio emission of cosmic-ray air showers between 40 and 80 MHz with an energy threshold of around 100 PeV. Even with the external trigger by the particle detectors, the separation of the air-shower signal from the radio background was difficult in the noisy environment of th...
The invention is a computerized mobile robot with an onboard internet web server, and a capability of establishing a first connection to a remote web browser on the internet for robotic control purposes, and a capability of establishing a second short range bi-directional digital radio connection to one or more nearby computerized digital radio equipped devices external to the robot. The short-...
High-speed and low-speed data converters serve critical functions in modern broadband mobile radios. This application note outlines how to determine high-speed data converter performance requirements in baseband sampling radio architectures. Also, system partition strategies and advantages are outlined when considering a high-speed analog front-end (AFE) solution. A similar version of this arti...
Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Petri Eloranta Name of the doctoral dissertation Direct-Digital RF Modulator for Multi-Standard Radio Transmitters Publisher School of Electrical Engineering Unit Department of Micro and Nanosciences Series Aalto University publication series DOCTORAL DISSERTATIONS 186/2014 Field of research Electronic Circuit Design Manuscrip...
General Dynamics C4 Systems extends the Digital Modular Radio (DMR) system to the High Frequency (HF) domain. Base-band serial and parallel tone modem functionality is integrated with embedded, AIM-based KY-99A, KWR-46, and KG-84C cryptographic algorithms plus single-sideband (SSB) radio frequency (RF) modulation to provide four channels of HF plain text (PT) and cipher text (CT) communication....
Our SERENDIP (Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations) project seeks to detect anomalous radio signals by spectrally decomposing Arecibo telescope data. Based on reconfigurable FPGA technology, our latest spectrometer hardware is seeing wide use within the radio astronomy community--proving the feasibility of developing general-purpose signal pr...
introduction foreign body insertion is a common and important cause of pre-pubertal vaginal bleeding. case presentation we present a three-year-old girl who referred to our clinic with abnormal vaginal bleeding without any other symptoms. the primary assessment revealed a radio-opaque round solid mass in the pelvic cavity. following vaginoscopy, the button battery was finally removed under gene...
The vision behind software radio (SR) is to realize the communication specific signal processing of a radio as far as possible on programmable hardware. An ideal SR samples the received signal directly at the antenna, and its hardware consists of a general purpose processor that is connected with analog-to-digital and with digital-to-analog converters. A radio that uses an analog radio frontend...
Digitized-Radio over Fibre (DRoF) techniques provide higher dynamic range and are more robust against optical link impairments. In this paper, a fully-photonic DRoF system is proposed and its performance is investigated in an integrated system with an analogue Radio over Fibre (ARoF) system. In this simulation based evaluation, DRoF and ARoF systems performance in the presence of other channels...
The GNU Radio and USRP are important tools that can be used by students to learn the theory of various areas, such as digital signal processing and telecommunications. This work presents how the GNU Radio and USRP has been used to transmit/receive signals in wired and wireless channels for a wide range of frequencies. Two case studies are discussed: cellular phone jamming and modulation classif...
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