Slow scan television via tactical satcoms
Abstract
A system which enables near real time moving picture information in redundant scenes to be transmitted over a low data rate tactical satellite communication link is described. The prototype equipment was designed to operate from automobile based satcom terminals using 16 kbit/sec tactical voice links. With the advent of more powerful satellites (SKYNET 4) the equipment should be usable with manpack type satcom terminals. The video codec operates at a constant 16 kbit/sec data rate and is therefore compatible with any 16 kbit/sec digital communications link. The system has two modes of operation: conventional slow scan television to build up the television frame, and conditional replenishment to send the moving picture information. The majority of information in a moving picture scene is stationary and is therefore redundant information.
- Publication:
-
In its RSRE Research Review
- Pub Date:
- 1985
- Bibcode:
- 1985rsre.nasa...45W
- Keywords:
-
- Data Links;
- Data Processing Terminals;
- Land Mobile Satellite Service;
- Pulse Communication;
- Satellite Networks;
- Satellite Television;
- Coders;
- Decoders;
- Real Time Operation;
- Video Communication;
- Communications and Radar