VRS参考站在海试中的应用

介绍了VRS虚拟网络参考站的基本工作原理、系统组成和应用,提出了如何使用VRS虚拟网络参考站来提高靶场在较大试验航区内的导航定位精度等问题.     

基于VRS技术的煤矿地表变形监测实践研究

随着采深的增大,晋华宫矿开采过程产生严重的地表沉降问题,对该矿地面建构及设施造成了安全隐患。该矿选择采用虚拟参考站技术(VRS技术)来对地表沉降进行测量监测。监测结果表明,VRS技术具有更好的准确性和科学性,在监测过程中表现出测量范围广、工作效率高、工作量小的特点,可以对该矿地表沉降问题进行有效监测。     

VRS与测深仪集成在苏州东南环桥隧水下地形中的应用

介绍了VRS与数字测深集成技术的测量原理,探讨了测量作业方法与影响测量精度的因素,及在苏州东南环桥隧工程穿越独墅湖段水下地形图测绘中的应用与体会,结合工程实例对测量精度进行了尝试性的验证,阐述了该方法成图周期短、成果准确可靠、效率高等特点.     

上海市VRS GPS台站网系统应用与管理

详细介绍上海VRS GPS台站网建设和应用状况,提出了针对商业服务的VRS GPS台站网系统服务与管理措施,对VRS GPS台站网系统的建设和管理具有一定的参考意义.     

VRS-GPS网络虚拟参考站技术在重庆城区控制测量中的应用与浅析

利用虚拟参考站技术VRS（Virtual Reference Stations）,结合重庆市区的特点,在区域性测区进行控制测量,分析其精度完全能够满足城市三级控制点的要求。     

超长LED显示屏控制系统的实现

针对超长LED显示屏数据输出速度慢这一瓶颈因素,从合理组织显示数据和提升硬件性能两方面着手探讨了解决办法.在分析数据组织算法和铁电单片机VRS51L3074硬件优势的基础上给出了相应的控制系统.方案的特点是将显示数据按输出顺序完整连续地排列在存储器中,由控制电路完成显示数据以DMA方式直接输出,并利用VRS51L3074的CS3扩展功能自动产生移位时钟,同时结合软件优化实现显示数据的高速输出.测试表明该系统能够可靠地驱动宽度为2 048列的超长LED显示屏并满足高刷新频率的要求,其控制功能具有易于扩展和可灵活配置的特点.     

Integrating Variable Reduction Strategy With Evolutionary Algorithms for Solving Nonlinear Equations Systems

Nonlinear equations systems (NESs) are widely used in real-world problems and they are difficult to solve due to their nonlinearity and multiple roots. Evolutionary algorithms (EAs) are one of the methods for solving NESs, given their global search capabilities and ability to locate multiple roots of a NES simultaneously within one run. Currently, the majority of research on using EAs to solve NESs focuses on transformation techniques and improving the performance of the used EAs. By contrast, problem domain knowledge of NESs is investigated in this study, where we propose the incorporation of a variable reduction strategy (VRS) into EAs to solve NESs. The VRS makes full use of the systems of expressing a NES and uses some variables (i.e., core variable) to represent other variables (i.e., reduced variables) through variable relationships that exist in the equation systems. It enables the reduction of partial variables and equations and shrinks the decision space, thereby reducing the complexity of the problem and improving the search efficiency of the EAs. To test the effectiveness of VRS in dealing with NESs, this paper mainly integrates the VRS into two existing state-of-the-art EA methods (i.e., MONES and DR-JADE) according to the integration framework of the VRS and EA, respectively. Experimental results show that, with the assistance of the VRS, the EA methods can produce better results than the original methods and other compared methods. Furthermore, extensive experiments regarding the influence of different reduction schemes and EAs substantiate that a better EA for solving a NES with more reduced variables tends to provide better performance.      

浅谈福州GNSS基准站网建设

本文主要介绍福州市GNSS综合服务系统的建设。阐述基准站建设的总体构架、主要功能,以及有关技术简析。     

基于PDA的高精度移动定位软件的设计与实现

讨论了VRS技术、串口通信、WinInet API HTTP通信、相似变换等关键技术问题,并以Visual Studio2005以及Windows Mobile5．0SDK为平台,开发了PDA定位软件,利用该软件求得坐标转换参数后,即可实时显示流动站坐标,实现本地坐标系统下的RTK定位以及成果保存等功能。试验分析结果表明,该系统达到了厘米级精度,且具有一定的应用价值。     

基于VRS技术GPS-PDA在土地变更调查中的应用研究

分析了土地变更调查的必要性,传统土地变更调查的缺陷,将VRS技术用于土地变更调查的意义;VSR系统的组成和工作原理;在VRS技术的支持下GPS-PDA功能以及工作流程;最后实例说明了整个系统工作过程,以及其优势。