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全球定位系统（GPS）在测量工作中已被广泛应用，可以达到很高的精度，且已有许多成熟的方法；不足之处是观测耗时较长，且对测量数据需进行室内的后处理，发现测量结果不符合要求时，还必须到现场补做外业工作。GPS与无线数据传输系统组合成整体，则不仅缩短观测时间，而且很快得到测量结果，即刻校对，不会再有返回现场重测的现象发生。对应用GPS与无线数据传输系统组合体进行的测量，我们称之为实时GPS测量。实时GPS测量由GPS信号接收、数据实时传输和数据实时处理3个部分组成。该测量可广泛用于公路工程，诸如测绘大比例尺地形图、工程控制测量、中线测量、断面测量、施工测量及变形观测等。
Global positioning system (GPS) has been widely used in the measurement work, can achieve high accuracy, and there are many mature methods; the downside is the observation takes a long time, and the measurement data need to be post-processed indoors , Found that the measurement results do not meet the requirements, they must also make up the field to do field work. GPS and wireless data transmission system combined into a whole, not only shorten the observation time, but also quickly get the measurement results, proofread immediately, there will be no return to the scene re-test the phenomenon occurred. The measurement of a combination of GPS and wireless data transmission systems is what we call real-time GPS measurements. Real-time GPS measurements received by the GPS signal, real-time data transmission and real-time data processing 3 parts. The measurement can be widely used in highway engineering, such as surveying and mapping of large-scale topographic maps, engineering control surveying, midline surveying, section surveying, construction surveying and deformation observation.