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.

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）

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