Engineering topics

Hall, R. G.

Publications and source records attributed to Hall, R. G..

3 records

NASA NTRS1979

Time transfer with the NAVSTAR global positioning system

The NAVSTAR global positioning system (GPS) was evaluated and tested in terms of performance. A variety of operational and technical issues were addressed which characterize the performance of the system. The precision and accuracy of the transfer of GPS time to the static user were measured and a base of information was developed that would support and expediate efforts to develop and evaluate specialized user equipment to exhibit the operational GPS's precision timing characteristics.

Roth, B. D.↗

NASA NTRS1974

Review of available synchronization and time distribution techniques

The methods of synchronizing precision clocks will be reviewed placing particular attention to the simpler techniques, their accuracies, and the approximate cost of equipment. The more exotic methods of synchronization are discussed in lesser detail. The synchronization techniques that will be covered will include satellite dissemination, communication and navigation transmissions via VLF, LF, HF, UHF and microwave as well as commercial and armed forces television. Portable clock trips will also be discussed.

Hall, R. G.↗

NASA NTRS1972

Absolute frequency of an atomic hydrogen maser clock

An accurate determination was made of the unperturbed atomic hydrogen ground state hyperfine transition frequency (F=1,m=0 - F=0,m=0) in reference to present world wide realizations of internationally defined time interval. In relation to the international atomic time system, the composite value is 1,420,405,751.7755 plus or minus 0.0031 HZ.

Peters, H. E.↗