本文讨论GPS网中各测站高差对同步环的影响.在高山地区进行GPS网观测时,当同步观测基线长度相差很大,往往基线两端的高差也很大,导致对流层模型改正值相差较大,双差观测方程求差后不能很好的削弱对流层延迟误差,其残余误差对基线解算质量产生严重的影响,从而导致同步环闭合差较大.%The influence of height difference of stations on difference of simultaneous observation loop of GPS net will be analyzed in this paper. When the height difference between the ends of the baseline is large in mountain regions, the weather conditions usually are different, the tropospheric delay can not be mitigated by the usually used double difference technology, and the residual tropospheric delays was still affecting the quality of baseline and serious influence on the difference of simultaneous observation loop of GPS net. It must be seriously considered to eliminate the tropospheric delay in the engineering GPS projects with large height difference.
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