LINCOLN EXPERIMENTAL TERMINAL TRAINING AND FREQUENCY CONTROL
Abstract
The Lincoln Experimental Terminal timing and frequency control provides digital control signals to the frequency synthesizers which determine transmit and receive frequencies and system timing signals to such equipment as the sequential encoder-decoder and the sync recovery system. Every 200 Msec a new 15-bit frequency control word is sent to the transmit and receive synthesizers, the transmit word containing the information signal plus one-way doppler prediction superimposed on the frequency-hopped base frequency, and the receive word containing one-way doppler prediction plus measured frequency error superimposed on the base frequency. Every 5 ms a sync signal is substituted for the information signal in the transmit word and a separate frequency control word is sent to the sync receiver frequency synthesizer. Timing of all output signals is variable in response to predicted path delay and measured time error.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 04, 1966
- Accession Number
- AD0638198
Entities
People
- Norman L. Daggett
Organizations
- Massachusetts Institute of Technology