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For the real-time transmission of stream media, a novel synchronization control strategy is proposed in this paper. The strategy includes the layer-based flow control algorithm and the delay jitter compensating algorithm. In order to avoid the network congestion and ensure that the data transmission is not less than the frame bit-rate, the former adjusts the streaming media frame bit-rate and the...
Global information grid (GIG) employs service oriented architectures (SOA). It enables loosely coupled applications, service reuse, flexibility in system design and the ability to rapidly assemble applications. The key to all of this is the ability to manage all information data and services in the effective way. This paper presents the distributed cross-domain heterogeneous resources extensible management...
In order to solve the traffic congestion problem, the characters of traffic should be investigated. Cellular Automaton (CA) models based on brake light rule (BL) can reproduce the three-phase traffic flow. However, all BL models assume that all drivers have the same driving mode. In fact, vehicles can be divided into three types: aggressive, normal and timid. The influence of driving modes on flux...
A Vehicle Travelling Data Recorder (VTDR) based on the newest Chinese standard (GB/T 19056-2012) is designed and implemented. The VTDR can collect, store and query the data in real time, write the stored data to the U disk, and display the related information on the screen. The practical tests show that it fully complies with the newest Chinese standard, including collecting data in real-time and...
Ultra-wideband (UWB) systems against TDT (timing with a dirty template) synchronization acquisition algorithm is only suitable for pulse amplitude modulation (PAM). This paper presents the pulse position modulation ( PPM ) using the Hermite pulse based on dirty template mode ( TDT ) synchronous acquisition algorithm. We deduced the expression of the received signal in PPM modulation. We analyzed the...
The Carrier Phase Measurement (CPM) of GPS may achieve high precise location because of its short wavelength. While when a moving object comes into an enclosed area, GPS signal will be limited. For this paper, we propose a new indoor positioning model which aims to achieve cm-level indoor location by using CPM method. One of the most important parts of this model is to extract the most accurate carrier...
IEEE1588 standard Precision Time Protocol (PTP) is proposed to solve the high precision time synchronization problems in the application field. This technique will be ported to LINUX + inhibits PTP program POWERPC platform, makes it with the support of hardware timestamp of 100 ns level timing accuracy. We tested and analyzed software and hardware timestamp that affects the performance of GPS clock...
Message-Driven system supports to quickly (and asynchronously) perceive and respond the messages in transactions. It provides the ability to construct loosely coupled system. A complex Message-Driven system generally serves for many parallel tasks. Synchronization mechanism is unavoidable. Some specific dead lock problems might be caused by inappropriate resources competition among parallel tasks...
The limitation of processing capacity, memory capacity, I/O and bandwidth of single network server became the bottleneck in providing better services for the clients in practice. In order to solve this problem, we developed a new Java message service based Message Oriented Middleware that support high reliability cluster. Then we analyzed the detailed designation and implementation of the main components...
The attitude variation of the platforms for airborne bistatic synthetic aperture radar (BiSAR) will cause the unsteadiness of the antenna phase center (APC) and the phase error of the echo due to inevitable installation error of the antenna, which will result in the spatial synchronization error. In this paper, the spatial synchronization error compensation based on attitude is proposed for BiSAR...
To analyze and validate AADL (architecture analysis and design language) behavior model, a mapping regulation between AADL behavior model and BIP model was proposed based on the syntax definition of AADL behavior annex and the descriptive way of behavior. After the transformation we can use the BIP tools to check and validate BIP behavior model. Finally an AADL model of real-time critical system was...
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