求翻译：　摘要：本文主要就高速铁路精密测量问题之一的GPS控控制网优化设计及测量方案进行了探究，提出了精密控制网优化设计指标，并在时零类、一类、二类和三类GPS网优化技术研究的基础上，阐述了高速铁路精密控制网测量方案和要求。是什么意思？

Abstract: This review focuses on high-speed rail precision measurement of one of the gps control to control the optimization of design and measurement program carried out to explore the precision control network to optimize the design specifications, and when the zero class, a class, II and III gps

Summary: This article is primarily on high-speed railway precision measuring one of the problems with the GPS control Web optimization design and measurement program was carried out by exploring and the precision control Web optimization and design of indicators, and, in time, a category 0 and categ

　Abstract: This article mainly of GPS on high-speed railroad precision measurement questions controlled the control net optimization to design and surveys the plan to carry on the inquisition, proposed the precise control net optimization design target, and in the time empty class, kind of, two kind

　Abstract: this paper mainly on high-speed precision measurement of GPS control network in one of optimization design and measurement of programmes for the exploration, made a precision control network optimal design of indicators, and zero class, a class, b class and c class GPS network optimizatio