GDOP for GSM\DOA_T1R2_GDOP.m ............\DOA_T1R3_GDOP.m ............\FDOA_DOA_T1R1_GDOP.m ............\FDOA_DOA_T1R2_GDOP.m ............\FDOA_DOA_diff.m ............\TDOA_DOA_T1R1_GDOP.m ............\TDOA_DOA_diff.m GDOP for GSM