读写N导航文件\1234.txt
.............\dataread.asv
.............\dataread.m
.............\eph.dat
.............\get_eph.m
.............\lbch1820.14n
.............\lbch1820.14o
.............\main.m
.............\rinexe.asv
.............\rinexe.m
.............\作业1.txt
读写N导航文件