Design and Simulation of Synchronization Algorithm for Short Time Burst Mode GMSK Signal
The AIS (Automatic Identification System) is a marine monitoring system with means of detection capabilities, providing multi user applications for offshore services. The satellite based AIS system send the received AIS signals for analysis by one or more low orbit satellites. The satellite based AIS is a new navigation aid system which can be used as a complement to navigation system. The AIS system is a Non real time communication system, using GMSK modulation. The reception of short time burst AIS signal is facing frame synchronization, Doppler shift compensation, phase compensation, delay spread and other issues. This paper describes an innovative synchronization algorithm for the short burst mode GMSK signal. There are several advantages of this synchronization algorithm. The signal is processed in real time. It voids the loss of data caused by commonly used loop structure. The devised algorithm provides an excellent performance against noise, delay spread, frequency offset and phase offset. The demodulator using this synchronization algorithm shows that the bit error's performance degradation is only about 0.3 dB.