Simulation of Downlink Synchronization For a Frequency-Hopped Satellite Communication System.

摘要

Many military communication systems are required to operate in environments where an enemy may attempt to interfere with the communication. One of the most serious threats is the use of jammers. This threat has caused designers of communications systems to counter with the use of spread spectrum techniques such as frequency-hopping. Frequency-hopped spread spectrum satellite communication systems provide robust communications resilient to many types and levels of jamming. Unfortunately this increase in resilience is offset by an increase in complexity while establishing the communication link, termed synchronization. This document describes a downlink synchronization process that involves the transmission of synchronization hops by the satellite and a two-step ground terminal synchronization procedure. In addition computer simulation results are documented which demonstrate that the proposed synchronization algorithm is able to operate in environments as severe as the communication link.