Demonstration of High Data Rate and Medium Data Rate VSAT Communications usingthe Global Broadcast System (GBS) Transponder

摘要

During the months of November and December 1996, the Naval Research Laboratory(NRL) successfully demonstrated medium data rate (160 kbps) and high data rate (1.288 Mbps and higher) satellite links using transponders for the Global Broadcast System (GBS) and Joint Broadcast System (JBS). The demonstration was conducted at NRL with assistance from the Defense Information Systems Agency (DISA) and the Operational Support Office (OSO). Direct sequence spread spectrum (DSSS) links and conventional QPSK (1.544 Mbps) links were established on a satellite transponder that was simultaneously occupied with the GBS broadcast originating at the GBS earth station terminal at the Pentagon. The DSSS signal was transmitted using a very-small-aperture-terminal (VSAT) having a 24 articulated antenna, and was received by the 3.7 m earth station. The conventional QPSK signal was transmitted from the earth station and was received by the VSAT. Test results showed that the satellite transponder could support the broadcast, a conventional QPSK signal and a DSSS signal simultaneously. Bit error rates in the 10(exp -6) to 10(exp -8) range were achievable. This report addresses the tests conducted and the potential that a VSAT system, used either