基于PXI总线的远程测控系统

随着计算机和网络的迅速发展,以及人们对测试系统的精度、数据处理和资源共享要求的不断提高,基于网络的测控系统也被逐渐地应用到工程领域,本文介绍了一种基于PXI总线的远程测控系统,并讨论了组建的方法。     

Information loss recovery for JPEG2000 image transmission in an error-prone environment

Information loss recovery techniques are important for transmitting images over error-prone channels at the decoder. A novel error recovery scheme for JPEG2000 image is presented in this paper, which adopts different techniques for the lowest frequency coefficients and high frequency coefficients in the wavelet domain. The low-frequency recovery algorithm was implemented by adopting the watermarking technique and the packet structure of JPEG2000. The low-frequency eoefficients taken as the hidden data were extracted from the compressed bit stream, and then were embedded back into the bit stream itself prior to transmission. The embedded data were used to recover the information loss. High-frequency reconstruction was performed in bitplane base. The damaged bitplanes were recovered according to the correlation in the wavelet subband structure and by using the algorithm based on the horizontal and vertical edge detection. Experiments verified the effectiveness of these algorithms.     

基于VXI总线的惯性平台网络化测试系统

本文设计并实现了一种惯性平台网络测试系统。该系统具有C/S/B三层复合式网络体系结构,现场测试采用基于VXI总线的自动化测试方案,以Ethernet为底层测试网络,应用基于TCP/IP的网络测试技术,实现了惯性平台的远程测试、测试信息发布与浏览、远程测试性能分析与信息管理等功能,为惯性平台的远程故障诊断和远程专家指导与决策提供了可靠的硬件平台。