论GPS星座组成及若干抗AS方案

本文首先讨论GPS星座组成及美国的用政策，阐述了AS措施及其对GPS测量的影响。然后，对抗AS的若干方案进行介绍，分别对平方法、互相关法、码相关干法及P－W技术（Ashtech法）进行叙述和评论，指出它们的优缺点，评述它们在GPS技术发展过程所起的作用。最后，对GPS星座建成后的形势作了小结，并对当前我国GPS事业的有关问题提出四点建议。     

影响磁式TIMS测量准确度的主要因素

测量准确度是热电离质谱 ( TIMS)的重要指标 ,对于使用年限较长的 TIMS,造成准确度下降的因素很多 ,分析判断更复杂。为了准确、系统地了解其中的主要原因 ,本文从 TIMS的基本工作原理出发 ,对影响测量准确度的主要因素 ,如离子束的角分散、能量分散、电磁场稳定性、多接收器的形变和位移、电子倍增器的衰老和放大器增益的差异等及相应的解决办法作了较深入的探讨     

无人机定位技术及其应用

分析了无人机定位过程及定位原理，着重研究了无人机定位精度，比较了各种定位方法。提出利用无人机定位技术可提高超视距反舰导弹作战能力。     

由单片机构成的噪声测量自动定位装置

介绍一种由单片机构成的噪声自动定位系统，他精度高、定位准确具有高度的智能化和优越的性能价格比。     

Experience with Siberian Centralized Dispatch Regulation regarding location determination of damages sustained by intersystem high-voltage transmission lines

A set of measures that can be implemented by the Relay-Protection and Automated-Equipment Service for Centralized Dispatch Regulation (CDR) in Siberia to determine the location of damage sustained by inter-system 550-and 220-kV transmission lines maintained by the United Power System (UPS) of Siberia, and the methodology and technology of damage-location determination (DLD) are described. The damage sustained by the 500-kV high-voltage lines (HL), and the accuracy of DLD relative to zero-sequence emergency parameters are analyzed statically. __________ Translated from élektricheskie Stantsii, No. 5, pp. 59–62, May, 2006.     

一种基于DBF的双基地雷达系统的性能分析与实验研究

讨论了一种基于数字波束形成的脉冲追赶式双基地雷达系统的构成和基本工作原理．对该双基地雷达的性能进行了理论分析，并通过实验结果进行了验证。     

主轴回转精度测试中的多圈数据采集及处理

本文就主轴回转精度测试中的多圈数据采集和处理方法作了探讨。根据提出的方法和改进后的测试系统编制了实用程序,进行了实测,获得了测试结果。     

高精度节能型电力稳压器

分析了现有交流稳压器的特点和不足,提出了新一代数控稳压器的理论和实际无均差系统的方法,给出了超高精度无均差稳压系统的实现方法.经全乐科技公司模拟试验,获得了很好的结果.市电220.4 V和220.5 V,试验样机采用3 V、9 V和27 V这3个变压器,已达到优于±1%的精度,符合大部分负载的实际需要,经用户单位试用半年,效果非常满意.     

水轮发电机定子浮动式双鸽尾筋调整工艺浅析

水轮发电机定子采用浮动式双鸽尾筋是当今设计上较为先进的结构,是防止定子铁心变形的重要措施之一,制造厂一般会提供安装调整的工艺措施,但此工艺措施更多的是检查的标准,对如何具体操作不够详细,安装调整完全依靠施工人员的经验进行。如何有针对性的分析调整工艺中的难点和易忽略点,提出更具指导性的调整工艺,成为了一个需研究的课题。     

Speed–accuracy tradeoff in Fitts’ law tasks—on the equivalency of actual and nominal pointing precision

Pointing tasks in human–computer interaction obey certain speed–accuracy tradeoff rules. In general, the more accurate the task to be accomplished, the longer it takes and vice versa. Fitts’ law models the speed–accuracy tradeoff effect in pointing as imposed by the task parameters, through Fitts’ index of difficulty (I_d) based on the ratio of the nominal movement distance and the size of the target. Operating with different speed or accuracy biases, performers may utilize more or less area than the target specifies, introducing another subjective layer of speed–accuracy tradeoff relative to the task specification. A conventional approach to overcome the impact of the subjective layer of speed–accuracy tradeoff is to use the a posteriori “effective” pointing precision W_e in lieu of the nominal target width W. Such an approach has lacked a theoretical or empirical foundation. This study investigates the nature and the relationship of the two layers of speed–accuracy tradeoff by systematically controlling both I_d and the index of target utilization I_u in a set of four experiments. Their results show that the impacts of the two layers of speed–accuracy tradeoff are not fundamentally equivalent. The use of W_e could indeed compensate for the difference in target utilization, but not completely. More logical Fitts’ law parameter estimates can be obtained by the W_e adjustment, although its use also lowers the correlation between pointing time and the index of difficulty. The study also shows the complex interaction effect between I_d and I_u, suggesting that a simple and complete model accommodating both layers of speed–accuracy tradeoff may not exist.