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We present the design of a distributed data acquisition system for passive and active multi-modal sensing that is capable of synchronized signal sampling within ±5 microseconds. The system is employed in a “wireless cortex” architecture for multi-modal cognitive scene analysis.
When designing underwater surveillance acoustic arrays with multiple receiving hydrophones and transmitting transducers, researchers may have the luxury to develop custom data acquisitions systems with the appropriate number of receiving and transmitting channels located in one unit. This unit then digitizes and records the hydrophone signals using a single clock and processing circuitry. This ensures...
This paper proposes a coarse-to-fine two-level synchronous data acquisition and transmission system for binocular stereo vision, which satisfies strict synchronous requirement of stereo vision.Specifically,this synchronization system design contains: the hardware circuit design based coarse level and the hardware description language (HDL) design based fine level.The former includes synchronization...
Knowing the time at which sensors acquired data is critical to the proper processing and interpretation of that data, particularly for mobile robots attempting to project sensor data into a consistent coordinate frame. Unfortunately, many popular commercial sensors provide no support for synchronization, rendering conventional synchronization algorithms useless. In this paper, we describe a passive...
With the rapid development of VLSI (very large scale integrated circuits), programmable logic devices have made great progress in integration level, manufacturing technology and encapsulation technique, which make its functions more complex and the reverse analysis of it becomes more difficult. As an important component of the reverse analysis of the logic-unknown chip, the processing capacity and...
The measurement of railway clearance is the important guarantee way to the safety and the high-speed operation. A new scheme of non-contact clearance measurement method is proposed based on laser sensor in this paper. A high speed data acquisition card is designed based on FPGA, completing the laser data acquisition and clock synchronization. And an algorithm of vibration compensation is designed...
Quantitative ultrasound diagnosis of osteoporosis has become one of the most potential methods for measuring Bone Mineral Density (BMD) because of its advantages of low-cost, no radiation and high precision. With the method of pulse transmission, we develop a detection system of quantitative ultrasound parameters taking TMS320F2810 as the core, so high-speed data acquisition and synchronization of...
For the practical application of synchronous acquisition of digital signals on many kinds of circuit boards, this paper, based on NI-TCLK (Trigger clock) synchronization technology, the modular hardware as the circuit board based on PXI (PCI extensions for Instrumentation) bus, as well as the modular software as NI-LABVIEW, a multi-module synchronic data acquisition system is developed. Accordingly,...
The ARGO-YBJ experiment has been in stable data taking since November 2007 at the YangBaJing Cosmic Ray Laboratory (Tibet,P.R. China, 4300 m a.s.l.). Its main fields of research are γ-astronomy with an energy threshold of a few hundred GeV and cosmic ray physics in the 1-1000 TeV energy range. The ARGO detector consists of a single layer of RPCs operated in streamer mode, covering a total instrumented...
Instruments for Control and Data Acquisition (CDAQ) require a pervasive embedded network able to provide accurate timing and synchronization signals to all digitalization/reconstruction devices and control processes of a CDAQ system. Typically, the industry trend is to adopt a well established computer instrumentation standard and complement it with adequate timing and synchronization resources for...
Current PET systems with fully digital trigger rely on early digitization of detector signals and the use of digital processors, usually FPGAs, for recognition of valid gamma events on single detectors. Timestamps are assigned and later used for coincidence analysis. Good timing resolution is important, allowing better rejection of singles and leading to increased reconstructed image quality. In order...
The purpose of this paper is to present a new method and structure for the automatic configuration of a digital system to unknown delays in synchronous input data channels. The method makes possible to restore synchronism in node-to-node communication. Synchronism may be lost due to different delays introduced by the various communication channels. The proposed method allows differences in the channel...
The design and implementation of the distributed data acquisition unit (DDAU), which is based on GPS synchronization and ZigBee, are described. The DDAU is used in three-dimensional electromagnetic exploration targeted for oil and gas (hydrocarbon) detection. It is composed of data acquisition and DSP module, embedded control module, GPS sync and timing module, and power supply module. The data acquisition...
In the paper the problems that arise in the experimental evaluation of DACs dynamic parameters are discussed. Usually, a measurement station for DAC characterization provides the time evolution of the DAC output voltage. A fundamental issue deals, then, with the synchronization between the acquired voltages and the codes sequence at DAC input, in order to shape the DAC characteristic, which associates...
The acquisition data synchronization mechanism of complex motor vehicle road way test system was studied in the paper, for the industrialization research on the vehicle dynamic stability system, i.e. DSC. The complex test system was composed of several independent DAQ subsystems and its representative structure was introduced firstly. Then the performance of representative GPS technology based instruments...
In view of the bridge structure monitor signal type and the distribution characteristic, has designed and constructed a high performance distributed data acquisition system for bridge health monitoring. The system topology uses the double ring network of optical fiber, and has designed the acquisition software flow, analysis department entirely failure diagnosis, the acquisition time synchronization...
The towed array electronics is essentially a multichannel real time data acquisition system. The major challenges involved in it are the simultaneous acquisition of data from multiple channels, telemetry of the data over tow cable (several kilometres in some systems) and synchronization with the onboard receiver for accurate reconstruction. A serial protocol is best suited to transmit the data to...
Shrinking process tolerances due to decreasing device sizes and increasing chip complexity in semiconductor manufacturing are motivating efforts to improve methods of equipment data acquisition (EDA). Prior work shows that the lack of precise time-stamping and clock synchronization is a critical hindrance to reliable data acquisition and real-time process control systems. The ultimate goal in the...
Healthcare monitoring applications require the measurement and the analysis of multiple physiological data. In the field of biomedical research, these data are issued from different devices involving data centralization and synchronization difficulties. In this paper, we describe a smart hardware modules network for biomedical data real time acquisition. This toolkit, composed of multiple electronic...
Time synchronization is very important to coordinate data acquisition in wireless sensor networks (WSN's). In this paper, we propose a physical-layer time synchronization scheme using ultra-wideband (UWB) signals. The synchronization is performed by emitting reference UWB signals at pairs of neighboring nodes alternatively. Once one node receive the UWB signal from the other of the pair, the local...
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