远洋船海事FB站通信链路时延分析

介绍Inmarsat BGAN系统的基本组成、终端形式及业务特点;叙述某远洋船海事FB站通信系统结构;针对该船海事FB站通信系统存在的传输时延及时延抖动偏大问题,进行机理分析;查找时延主要因素,重点对链路中的传播时延进行计算,提出更改海事卫星业务接续站(POP)注册、采用北京卫星地面关口站(SAS)等链路结构优化方法。实验结果表明,链路优化后时延值明显减少,提高岸船通信链路整体性能。     

提高博里叶变换光谱仪分辨率的一种方法

从傅里叶变换光谱的基本原理出发，得出傅里叶变换光谱仪内部的双光束干涉的光程差是影响其分辨率的最主要因素．介绍了几种通过改变仪器的结构设计，来增加双光束干涉的光程差，从而提高仪器分辨率的方法．在分析聚焦型干涉仪和折返式干涉仪的结构基础上，设计了多面多次反射干涉仪，在相同制作误差和运动误差情况下，此干涉仪的分辨率比前者提高了约一个数量级．给出了扩展光源情况下仪器的分辨极限。     

An Innovative On-Board Computer for Space Robot

In this paper an on-board computer system for the first Chinese Intelligent Space Robotic System was presented. A fault tolerance design on on-board computer （OBC） was proposed that allows commercial-off-the-shelf （COTS） devices to be incorporated into dual processing modules of on-board computer. The processing module is composed of 32-bit ARM RISC processor and other COTS devices. This innovative approach deeply relies on light weight/low cost equipment development using commercial miniaturized parts and non-space qualified technologies. As well as, a set of fault handling mechanisms was implemented in the computer system. The on-board software was organized around a set of processes that communicate between each other through a routing process. The qualification experiment shows that the fault tolerant on-board computer has excellent data processing capability and is enough to meet the demanding of the extremely tight constraints on mass, volume, power consumption and space environmental conditions.     

Solving Electromagnetism Differential Equations Based on Random Walk

An approach of solving the finite difference equations with Monte Carlo method was presented. The accuracy of algorithm is guaranteed by the Central Limit Theorem. The computation of the value on each single node is independent of each other, which makes it easy to realize the algorithm in parallel processing and greatly improves the efficiency while dealing with local area computation. As long as different kinds of boundary conditions are statistics modeled ,wide applications can the be made where the finite difference method is of competence.     

Helmert方差估计在苏通大桥测量中的应用

导线测量在宽阔水域桥梁施工控制网的加密测量中得到广泛应用，由于存在两类不同性质的观测值以及导线边长长度不等的问题，平差时应当考虑边角观测值权的统一和不同观测边权的合理取定。本文结合苏通长江公路大桥C3标施工加密控制测量的实际情况，对跨江导线测量中边长相差较大等问题，采用Helmert方差估计方法，分析平差过程中权的合理取定问题，明显地提高了导线测量平差成果的精度，确保了苏通长江公路大桥C3标跨江导线加密测量的质量。     

机动目标的多脉冲宽带相关成像方法研究

研究了图像特征点的时延-时间伸缩参数提取方法，通过建立旋回规避运动目标的成像几何模型和运动方程，得到了目标运动参数求解估计方法，最后研究了一种针对目标作非合作旋回规避运动情况的多脉冲宽带相关成像方法．通过仿真验证，表明该方法较传统的宽带相关成像方法分辨率高．     

差示扫描量热法测定碳酸氢钾的分解热

论述用差示扫描量热法测定化学反应热的原理。以碳酸氢钾分解反应进行实验测定，实验结果与理论计算结果了取得一致。由于本法能宣地测定各种热力学参数和动力学参数，可广泛应用于应用科学和理论研究中。     

兰新客运专线动车组设备舱差压跟踪试验研究

YU Qingbin;ZHANG Lan(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China)     

CBTC系统中计轴区段ARB状态判定方法

故障占用是计轴系统的故障模式之一,在移动闭塞信号系统中,对运营效率的影响较大。在CBTC系统中,通过ARB的判定来减小计轴区段故障占用对运营效率的影响。ARB判定本身是一个安全关键功能,如果误判ARB,可能导致列车追尾的严重后果。因此,该功能在很大程度上影响着CBTC系统的安全性和可用性。介绍了CBTC系统中ARB判定的一种方法。