连续运行参考站网的演化与发展趋势

立足于卫星导航与定位领域的研究现状,阐述了连续运行参考站网(CORS)的初步概念,对其概念的衍化和相关技术的发展作了简要叙述,介绍了其在该领域的国内外研究和建设现状,详细分析了CORS及空间信息技术在我国的发展趋势,指出我国建设大规模连续运行参考站网的意义所在。     

连续运行卫星定位系统在基础测绘中的应用

具有实时定位功能的连续运行卫星定位系统(Continuous Operational Reference System,CORS)是当代城市信息化、数字化发展的热点,可以满足基础测绘的需要,采集动态的基础测绘信息。本文对传统测量手段和测量成果的缺点进行了分析,阐述了CORS在国内外的发展状况、系统结构和系统功能,并结合广西北海市连续运行卫星定位服务系统建设规划讨论了CORS在基础测绘中的应用。     

Alternatives to current GPS-RTK services and some implications for CORS infrastructure and operations

The justification for the establishment of CORS networks was initially in support of geodesy and other geoscientific applications at the global and regional level. However, increasingly GPS CORS network operators have sought ways of making their network infrastructure the basis of a profitable business. This has arisen with the introduction of real-time centimeter-level accuracy services, carrier phase-based modes of operation generally referred to as GPS-RTK (real-time kinematic). One approach is to try to recruit a core group of users who are prepared to pay for the GPS-RTK services. But this is only feasible if the number of users, and the fees that are charged, are sufficient to generate a reasonable return-on-investment (ROI). This ROI (or at the very least “cost-recovery”) is important for many network operators in order that they may provide for the maintenance and upgrade of the CORS infrastructure. On the other hand, there are those who advocate that there is no need to recoup CORS investment, that the installed GPS receivers should be seen as public infrastructure in a similar manner to roads, bridges, etc. This paper discusses some new business and operational models for GPS-RTK services. These include models for the establishment and operation of CORS infrastructure, service provision, business cases, and options for value-added services beyond the standard GPS-RTK service. One concept is based on a “client–server” model. Currently GPS-RTK service providers have no control over the quality of the results computed by users. This makes it difficult for them to justify charging for their services. What if instead of broadcasting RTK corrections and placing the onus of obtaining a final solution on the user and his equipment, the user’s coordinates are determined by the service provider? Putting the computational effort on the server side will justify more easily the charging of users for a value-added product: an accurate and quality assured coordinate in the local reference frame. This paper describes the client–server concept as well as possible business models that may underpin such a service model. These models include some derived from mobile telephony and service/hospitality businesses. Furthermore, with the projected proliferation of independent, competitive GPS-RTK services, the concept of a GPS data or service “broker” is worth exploring.     

珠海市现代测绘基准体系建设与应用

随着科技的不断进步,为了保障城市的建设发展,很多城市迫切需要构建地方现代测绘基准体系。本文以珠海市为例,阐述了城市现代测绘基准体系建设工作;介绍了城市测绘基准历史情况及存在的问题,重点阐述了城市现代测绘基准的具体建设工作,主要包括技术路线和方法、建设内容及成果应用。     

基于CORS网监测台州地区陆地水负荷对地表垂直形变的影响

基于CORS站网基线综合解算,利用移去-恢复法和负荷形变法监测陆地水负荷对地表垂直形变的影响。以台州地区为例,对2017~2019年CORS站网和相关区域负荷数据进行分析。结果表明,台州地区陆地水负荷对地表垂直形变的影响存在季节性变化,地下水负荷影响较为明显,可达cm级;且该影响在年际尺度上相对稳定。利用CORS站网可以监测陆地水负荷引起的地表垂直形变,为水动力环境监测与地质灾害监测提供参考。     

基于JSCORS的无验潮水下地形测量研究

提出了一种无验潮水下地形测量方法,利用长江江苏段沿岸的控制点资料,基于分段二次曲面与BP神经网络拟合算法建立似大地水准面精化模型;利用该模型换算测深点高程数据文件,并输出数据成图。经多方面精度测试比对,此方法能够获得高精度的水底点高程。     

基于CORS的区域动态框架网建设方法探讨

在介绍全球导航卫星系统(GNSS)连续运行参考站概念的基础上,分析了2000国家大地坐标系(CGCS2000)参考框架的发展现状。结合"环渤海GPS大地控制网"的建设与动态框架维护情况,探讨了在我国建立基于CORS的区域动态参考框架网的方法。     

CORS 在电力设计工程测量中的应用

电力工程建设规模大、任务紧,安全水平要求高,这就要求电力工程勘测要拥有更高的测量技术、方法,从而提高工作效率。电力工程测量是电力工程建设中一项重要的内容,电力工程随着测量设备及测量手段的逐渐完善,其效率日渐提高。本文结合工程实践,介绍CORS 系统在架空送电线路像控中的应用,并对推广CORS在工程测量中的应用进行了讨论。     

基于吉林 CORS 的线路工程测量技术研究

以基于CORS的线路工程测量为研究对象,以长春某石化供气管道工程为研究背景,简要介绍了吉林CORS系统的特点和功能,分析了吉林CORS在石化供气管道测量中的应用模式。在此基础上,探讨了作业实施方法及测量结果,并进行了误差分析。通过对比采用吉林CORS系统和常规RTK测量方式两种方法得出的数据精度,总结出吉林CORS系统的优、缺点。     

基于CORS系统的网络RTK技术在城市地形测量中的应用

近年来,随着测量技术的发展,CORS系统在测量中的应用越来越普遍。本文介绍了CORS的基本原理及组成,以厦门市集美区地形测量为例,阐述了XMCORS在城市地形测量中的使用情况,并对其精度及可靠性进行分析,探讨其在城市地形测量中应用的可行性和先进性。