水利水电勘测设计工程测绘中 [上一篇] [下一篇]

[ 2012-2-13 7:43:35 | 作者:李青 | 出处:原创 | 天气:晴 ] 字体:

一. 水利水电勘测设计工程测绘中, 基线解算是GPS数据处理中的一项至关重要的工作,其结果的质量将直接决定最终的数据处理成果。GPS数据预处理又是基线解算的重要前提条件。GPS数据预处理工作包括GPS原始数据的编辑与整理、数据质量评估等。由于在一些大型工程控制网的施测过程中,经常采用多种GPS接收机(测地型),因此该项工作的重要性越来越明显.

为了将不同类型的接收机所采集的数据进行统一处理,需要首先将各种原始数据转换为标准格式RINEX(Receiver Independent Exchange Format/与接收机无关的交换格式),然后再采用某一种GPS数据处理软件进行基线计算。它是一种体积小巧、功能强大、简单实用的GPS数据预处理软件TEQC(Translate/Edit/Quality Check),仅通过它即可对多种不同类型的接收机来进行数据转换、数据质量检查和编辑工作,能帮助水利水电工程等技术人员及时发现观测数据的质量问题。

二. RINEX数据格式

RINEX是一种在GPS测量应用中普遍采用的标准数据格式。该格式采用文本文件形式存储数据,数据记录格式与接收机的制造厂商和具体型号无关。RINEX最早是由瑞士伯尔尼大学天文学院于1989年提出的,当时是为了能够综合处理在EUREF89项目中4个不同的制造商共60多台接收机所采集的GPS数据。此后陆续对其进行了修订,目前最常用的为2.1版,可用于包括静态和动态GPS测绘在内的不同观测模式数据。该格式的提出意味着在实际观测作业中可以采用不同厂商、不同型号的接收机进行混合编队,而数据处理则可采用某一特定软件进行。RINEX已成为各制造商、高等院校、水利水电研究院等单位和用户在编制软件时所采用的标准数据格式。

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