The first stage is the project demonstration and preliminary design stage.
From 1973 to 1979, four test satellites were launched. The ground receiver and
ground tracking network are developed.
The second stage is the comprehensive development and test stage. From 1979
to 1984, seven more test satellites were launched and receivers for various
purposes were developed. The experiment shows that the accuracy of GPS
positioning far exceeds the design standard.
The third phase is the practical networking phase. On February 4, 1989, the
first GPS working satellite was successfully launched, indicating that the GPS
system entered the stage of engineering construction. At the end of 1993, the
operational GPS network, the (21+3) GPS constellation, was completed, and in the
future the defunct satellites will be replaced according to the plan.
Global Positioning system has the characteristics of good performance, high
precision and wide application. It is the best navigation and positioning system
so far. With the continuous improvement of global positioning system, hardware,
software, the application of the field is constantly expanding, has been
throughout the national economy in various departments, and gradually into
People's Daily life. After nearly 10 years of surveying and mapping departments
in China, GPS with all-weather, high precision, automation, high efficiency and
other remarkable characteristics, won the trust of the majority of surveying and
mapping workers, It has been successfully applied to geodesy, engineering
survey, aerial photogrammetry, navigation and control of vehicle, crustal
movement monitoring, engineering deformation monitoring, resource exploration,
geodynamics and other disciplines, thus bringing a profound technological
revolution to the field of surveying and mapping.
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