Search results for: Hongcheng Yan
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Time synchronization is an essential infrastructure of various applications in sensor networks. In this paper, a time-stamping approach using field-programmable gate array (FPGA) is introduced which is applied to Reference broadcast synchronization (RBS). Then, Dynamic Adjusting Time Synchronization (DATS) protocol is proposed which enables the clock compensation to approach the optimal compensation...
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Since one navigation satellite can only be equipped with limited number of ISLs, the navigation satellite network forms a typical space delay/disruption tolerant network (DTN) which poses significant challenges to the design of transport protocol. Generally, the transport protocols can be divided into two categories which are end-to-end and hop-by-hop. The Transmission Control Protocol (TCP) employed...
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Due to the constraints of satellite platforms and Inter-Satellite Links (ISL), very limited ISLs can be equipped on the satellites, making the ISLs intermittently available. Meanwhile, the Ground-Satellite Links (GSL) are also intermittent due to the rotation between the constellation and the earth. Intermittent connectivity of both ISLs and GSLs makes the satellite constellation network a typical...
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By introducing inter-satellite links (ISLs), global navigation satellite system (GNSS) can achieve inter-satellite ranging, which can enable autonomous navigation, and inter-satellite communication, which can enable the GNSS to form a global network. Due to the resource constraints of satellite platforms, only limited number of ISLs (e.g. only one ISL) can be equipped on one navigation satellite,...
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Wireless Networks > 2015 > 21 > 6 > 2087-2099
The storage resources and communication opportunities in space delay/disruption tolerant networks (DTN) are usually very limited. Moreover, as the links in space DTN are often subject to long delay, intermittent connectivity and asymmetric bandwidth, end-to-end continuous path may not be guaranteed and messages may stay at intermediate nodes for a long time. Thus, congestion in space DTN, which takes...
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The low earth orbit (LEO) satellite networks are characterized by their significant dynamics of topology and traffic load which pose huge challenge to the development of routing algorithm. In this paper, a novel routing scheme based on link state routing, Satellite networks Link State Routing (SLSR), is proposed for LEO satellite networks. In order to relief the problem of high overhead and slow convergence...
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2010 International Conference on Computer Application and System Modeling (ICCASM 2010) > 10 > V10-635 - V10-637
Based on systematic analysis of BP neural network, a back-propagation neural network predicting model is proposed to forecast the net asset value (NAV) of investment fund by identification characteristic of neural network. Empirical analysis on HUAXIACHENGZHANG shows that the neural network predicting model has good nonlinear reflection ability, learning ability and prediction precision. The predicting...
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With the continuous improvement of the Embedded Microprocessor's main frequency, the signal transmission and processing becoming faster and faster, the traditional method of circuit design and software will not be able to meet the requirements of high-speed circuit design. However, an increasing number of VLSI chips' work frequency has reached above 100MHZ, the CPU with 450MHz will also be widely...
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2010 2nd International Conference on Future Computer and Communication > 2 > V2-464 - V2-466
A time difference of arrival (TDOA) estimation system based on fast cross correlation is introduced in this paper. The system takes ADS8365, FPGA and DSP as the core devices to implement multichannel synchronous data acquisition and real time data processing. Comparison between cross correlation and fast cross correlation in aspects of the principle and time complexity is also discussed. Experimental...
