TY - RPRT TI - Report on NBS Dual Mixer Time Difference system (DMTD) built for time-domain measurements associated with phase 1 of GPS AU - Allan, David W PY - 1976 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 75-827 DO - 10.6028/NBS.IR.75-827 ER -