GPS-RTK用于矿山高精度沉陷监测的可行性研究

针对复杂地表条件下采用水准测量和导线测量等常规方式进行地表变形周期观测、任务量大甚至无法实施等问题,提出了建立研究区域的似大地水准面精化模型,同时采用GPS-RTK技术获取观测站三维空间信息,进而获得概率积分法预计参数。最后以内蒙古准格尔旗某煤矿的生产实践说明该技术的有效性和可行性,极大地提高了工作效率,为保护煤柱的留设提供了科学的依据。     

Performance of rate detector algorithms for an integrated GPS/INS system in the presence of slowly growing error

In the Global Positioning System, there is no provision for real-time integrity information within the Standard Positioning Service, by design. However, in safety critical sectors like aviation, stringent integrity performance requirements must be met. This can be achieved using the special augmentation systems or RAIM (Receiver Autonomous Integrity Monitoring) or both. RAIM, the most cost-effective method relies on data consistency, and therefore requires redundant measurements for its operation. An external aid to provide this redundancy can be in the form of an Inertial Navigation system. This should enable continued performance even when no redundant satellite measurements are available. An algorithm presented in previous papers by the authors detects the rate of slowly growing errors. The algorithm was shown to be effective for early detection of slowly growing errors that belong to the class of most difficult to detect errors. Firstly, rate detector is tested for varying faults. Secondly, real data are used to validate the rate detector algorithm. The data are extensively analyzed to ascertain whether it is suitable for integrity and fault diagnostics. A modification to the original rate detector algorithm is suggested by addition of a bias state to the dynamic model. The performance is then compared with the existing techniques and substantial improvement is shown.     

对地铁结构监测基准点稳定性的研究

本文在研究大量变形监测技术与监测成果的基础上,注意到基准点的稳定性,它直接影响到监测成果的可靠性和客观性,尤其当基准点的稳定性超过两倍测量中误差时,监测成果不仅不能客观反映变形体的变形量,甚至出现较大偏差或错误,从而导致人们对变形体的变形趋势和安全性分析失准。因此,本文对监测基准点稳定性进行深入研究,并通过应用实例提出监测基准点的布设方法和稳定性分析方法。     

GIS在矿产资源潜力评价中的应用

GIS技术的广泛应用为矿产资源潜力评价提供了新的思路和手段,并对其产生了深远的影响。简要介绍了GIS、矿产资源潜力评价及GIS在矿产资源潜力评价中的应用现状,并根据基于GIS矿产资源潜力评价的3个步骤,详细阐述了GIS在矿产资源潜力评价中的具体应用及其优越性。     

Recent advances in accessibility research: Representation,methodology and applications

 In this article we examine recent advances in accessibility research and their implications for future studies. We base our discussion on three intersecting dimensions that are useful for evaluating the contribution of recent studies: representation, methodology and applications. Various examples are selected to show that research concerned with representation and methodological problem solving is often applied to issues of broad concern in policy and planning. It is, however, not clear that the simultaneous treatment of representation, methodological and application issues has ever been fully worked out. The questions raised in this article may serve as a foundation for addressing issues pertinent to accurate representation, improved model building, and more rigorous applications in accessibility research. Received: 9 December 2002 / Accepted: 10 February 2003     

苏州市轻轨精密工程控制网的建立

根据精密工程控制网的高精度要求，结合沉降地区的特点，进行GPS、精密水准作业中误差分析及精度控制分析，提出满足轻轨工程施工的控制方案。     

Integration and Sharing of Geo-spatial Data Based on Data Engine

Through analyzing the principle of data sharing in the database system, this paper discusses the principle and method for integrating and sharing GIS data by data engine, introduces a way to achieve the high integration and sharing of GIS data on the basis of VCT in VC , and provides the method for uniting VCT into RDBMS in order to implement a spatial database with object-oriented data model.     

基于特征的城市交通网络非平面数据库的实现

针对基于特征的GIS及交换网络分析对数据结构的要求，着重讨论了如何建立基于交通网络特征的非平面拓扑，以改进地理分层－关系表设计方法及平面图弧段－节点数据结构在交通网络描述中的不足之处，并通过面向对象的方法、动态分段技术和关系表指针操作，结合实例描述了基于完整交通特征的非平面数据库的实现方法。     

带权约束参数平差在工程控制网优化中的应用

介绍用带权约束平差原理编制的工程控制网试验修正法设计和平差程序,并用于设计工程导线和平差变形观测控制网等实际工程的例子,据此提供一些结论和建议.