NOTE ON FM TRANSMISSION OF VIDEO BETWEEN MOVING VEHICLES OVER A FLAT EARTH

A SIGNAL-TO-INTERFERENCE RATIO FOR THE TRANSMISSION OF SCANNED IMAGES AND DIGITAL DATA IN THE DYNAMIC MULTIPATH ENVIRONMENT WAS DERIVED IN AN EARLIER PAPER. THE DYNAMIC CASE DEPENDS UPON A DOPPLER ENVIRONMENT-SIGNAL PARAMETER RATIO, WHILE THE STATIC RESULT IS INDEPENDENT OF THE SIGNAL STRUCTURE. THE DYNAMIC CASE IS ASYMPTOTIC TOO, BUT ALWAYS WORSE THAN, THE STATIC ONE. FOR A DOPPLER-SIGNAL RATIO OF LESS THAN 10 PER CENT THE DYNAMIC SIGNAL-TO-NOISE RATIO IS ESSENTIALLY EQUAL TO THE STATIC ONE. MORE REAL SYSTEMS TODAY FALL IN THIS REGION. THIS INDICATES WHY CERTAIN SIMPLE MULTIPATH ANALYSES IN USE TODAY HAVE BEEN SUCCESSFUL. THE METHOD OF DESIGNING A SIGNAL TO FALL BELOW THE 10 PER CENT VALUE IS INDICATED. SIGNAL-TO-NOISE RATIO CURVES ARE PROVIDED FOR SYSTEM DESIGN PURPOSES. THESE RESULTS PERMIT SYSTEM ANALYSIS AND TRADEOFF STUDIES TO BE BASED ON EARTH REFLECTION COEFFICIENT DISTRIBUTIONS AND AIRCRAFT OR SATELLITE OPERATION ENVELOPES. /AUTHOR/

• Supplemental Notes:
  • Vol Vt-18, PP 81-84
• Corporate Authors:

  IEEE Transactions on Vehicular Technology

  ,    
• Authors:
  • Brooks, C N
• Publication Date: 1969-8

Subject/Index Terms

• TRT Terms: Amplifiers; Doppler effect; Driver information systems; Frequency modulation; Motion; Motor vehicles; Signal to noise ratio; Video display terminals
• Uncontrolled Terms: Moving vehicles
• Old TRIS Terms: Vehicular communications; Video amplifiers
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225705
• Record Type: Publication
• Source Agency: Traffic Systems Reviews & Abstracts
• Files: TRIS
• Created Date: Jul 6 1970 12:00AM