计算tec（tokyo）

代码说明：

  Estimate tec (total electron content) by least-sqaure adjustment using GPS dual-frequency code observables. Ionosphere is approximated as the single- layer model at the height of 350km with local or global tec model. Satellite/receiver dcbs (differential code biases) are estimated as well as tec model coefficients.

文件列表：

计算tec（tokyo）\gshhs_l.mat
计算tec（tokyo）\readme.txt
计算tec（tokyo）\readrnx.m
计算tec（tokyo）\readrpos.m
计算tec（tokyo）\tecdemo.m
计算tec（tokyo）\tecmodel.m
计算tec（tokyo）\testtec.m
计算tec（tokyo）