With the construction of smart grid in China, the Grid urgently needs a unified, high-precision time synchronization device. The device provide a reliable parameters of time to various secondary equipment for measurement and calculation.In this thesis, various ways that used to realize time synchronization of current power system were introduced and compared. And some deficiencies
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Modern power system has three important elements:voltage, current and phase, which are the measurement of quality of the power system. With the development of information technology and power system, time synchronization becomes more important to the power system.To solve the problem of time synchronous for power system, this paper presents a method about SDH-based time
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The medical ultrasound diagnosis technology is safe, convenient, hurtless, and inexpensive, but conventional medical ultrasound equipment’s defect consists in large size and high power consumption. The new generation portable digital ultrasound equipment based on embedded hardware platform and embedded operating system. This equipment can cost less, burn less power and achieve significantly higher performance than
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With the unremitting research of face detection technology in recent years, face detection technology has been greatly developed, and it gradually becomes an independent research project. People are often the most suitable objects which should be monitored in most video surveillance systems, and people’s face owns the most important features to be identified for a
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Software radio technology is now widely used in wireless communication systems, and more wireless communication devices are used in people’s lives. The idea of software radio is to make the analog digital converter as close to the RF front end, then output digital signal, so that subsequent frequency filtering, modem, communications protocol processing, can be
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High-Frequency surface wave radar is designed to detect and track maritime and low- altitude targets like ships, aircraft and missiles beyond the horizon. This is achieved by the propagation of the long electromagnetic surface wave over the earth surface. The maximum detection range of High-Frequency surface wave radar can reach to 300-400km, just between the
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As a channel code, LDPC (Low Density Parity Check) has received considerable attention due to its excellent error-correcting ability, high throughput and low decoding complexity. Therefore, LDPC code has been adopted in some communication standards such as DVB-S2, IEEE802.11n, and IEEE802.16e. With the further research of LDPC code, it is likely to be applied on
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When performing tasks that launching missile or rocket, telemetry antenna is indispensable equipment. It can track and lock the flying target, and receive the data from the target, then we can assess the effects of the launch through analyzing the data. Antenna servo subsystem is an important part of telemetry antenna, the antenna can track
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Efficiency and reliability are the general requirements for communication systems. Channel coding technique plays an important role in enhancing the reliability of communication systems. The serial concatenated code which is made up of the outer code Reed-Solomon code and inner code convolutional code with interleaver between them has an large error-correcting capability that performs well
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The USB technology has occupied most market of peripheral device interface since its birth. At present, various peripheral devices including low-speed and high-speed ones will also provide their versions of USB interface. Moreover, at the end of year 2008, the emergence of USB 3.0 protocol even commenced another spring of the USB market.In this dissertation,
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