Message store-forward is a system in which a message is uploaded to a satellite and held there until the satellite is in a position to download it to the destination. It is an alternative to bent-pipe systems. Millennium is a military research effort to design an ultra-wideband radio. Multipath propagation is a phenomenon in which copies of a transmitted signal arrive at different times at a receiver. NATO is the North Atlantic Treaty Organization.
Packet is a collection of information symbols transmitted together on a communications channel.
It was precompetitive research on advanced communications systems. It was superseded by the ACTS program. Radio spectrum is a range of radio frequencies required to support one or more communications channels. RAM is random-access memory. It provides a variety of cross-networking, repeater, and information services.