University NAVSTAR Consortium

在过去的几年里，卫星测量在效率和精度上都超过了传统的地面测量。这类测量技术中最强大的使用了由国防部开发的NAVSTAR全球定位系统(GPS)卫星。现在，对相距10公里或更远的GPS接收器之间的三维基线的测量通常是以1厘米的精度进行的。这样的测量可以使用便携式设备在几个小时或更短的时间内完成。NAVSTAR大学联盟(UNAVCO)目前正在利用全球定位系统进行世界范围的地壳形变和地震研究。联阿援助团以两种不同的角色为研究界提供服务。首先是以尽可能高的精度和效率开发和测试GPS终端和技术。第二个是向学术界提供全球定位系统设备和地球科学研究方面的援助，并提供培训，并集中研究努力提高垂直精度，以运动方式而不是静止方式进行精确测量，开发可靠和有充分记录的基线分析软件，交互计算和图形，数据存档，以及GPS技术在全球温室效应检测中的应用。这一续期奖继续支持这些活动。

Satellite surveying has surpassed traditional ground based surveying in both efficiency and accuracy in the past few years. The most powerful of such surveying techniques uses the NAVSTAR Global Positioning System (GPS) satellites, which were developed by the Department of Defense. Measurements of 3-dimensional baselines between GPS receivers separated by 10 kilometers or more are now being routinely performed with one centimeter accuracy. Such measurements can be completed using portable equipment in a few hours or less. The University NAVSTAR Consortium (UNAVCO) is now utilizing GPS for worldwide crustal deformation and earthquake studies. UNAVCO serves the research community in two different roles. The first is the development and testing of GPS terminals and techniques with the highest possible accuracy and efficiency. The second is offering GPS equipment and assistance to the academic community for research in earth sciences, and also providing training, as well as concentrating its research efforts on the improvement of vertical accuracy, precise surveying in a kinematic rather than a stationary mode, development of reliable and well documented baseline analysis software, interactive computing and graphics, data archiving, and application of GPS technology to the detection of "global greenhouse" effects. This renewal award continues support of these activities.