DOPPLER SHIFT CONSIDERATIONS IN NAVAL SATELLITE COMMUNICATIONS SYSTEMS EMPLOYING SYNCHRONOUS SATELLITES

Possible doppler shifts due to motions of existing stationary satellites are shown to be as large as 212 Hz/GHz. When the contribution due to ships motion and headway are added, total shifts of 2.5 kHz at X band are possible. To avoid a severe penalty in synchronization acquisition time in operating pseudonoise or frequency hop modems now considered for Naval satellite communication, some type of automatic doppler shift compensation is required. Several compensation methods are described that cannot obtain exact correction without undue complexity but can reduce the compensation error to less than 24 Hz/kHz of beacon carrier doppler shift with relatively simple techniques. Problems of phase noise due to phase lock loop bandwidths required to track changes in doppler shift and local oscillator spectral purity remain as prime problem areas. (Author)

• Corporate Authors:

  Naval Research Laboratory

  Stennis Space Center, MS  United States  39529-5004
• Authors:
  • Leavitt, E
  • LeFande, R A
• Publication Date: 1970-12-3

Media Info

• Pagination: 52 p.

Subject/Index Terms

• TRT Terms: Communications satellites; Doppler effect; Satellite communication
• Subject Areas: Marine Transportation; Operations and Traffic Management;

Filing Info

• Accession Number: 00015332
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NRL-7147 Inter Rpt
• Files: TRIS
• Created Date: May 13 1972 12:00AM