Research And Realization Of Carrier Synchronization System In Satellite Navigation Receiver

In the satellite navigation receiver, the system's demodulation performance directly affects the receiver normal working. In demodulation system, the reference carrier synchronization performance affects the demodulation system's. In synchronization communication system, synchronization is the premise of information transmission. In order to ensure the information transmit reliably, synchronization system should have a higher reliability, and the poor performance synchronization system will make the entire communication system work not well. So it is important to research and realize the excellent performance carrier synchronization system.Though anglicizing the carrier synchronization system theory, researching the structure that is suitable to Satellite Navigation Receiver. The paper mainly improves the NCO (Numerically Controlled Oscillator) and CIC (Cascaded Integrator Comb) Low-Pass Filter's structure to make the carrier synchronization system have better performance. NCO is designed using CORDIC(Coordinate Rotation Digital Computer)algorithm, and a narrow angle mapping technique has been proposed and described concisely. In contrast with the NCO based only on look-up table, its advantage is much less resource consumption; In contrast with the NCO based only on CORDIC algorithm, its advantage is shorter pipeline. The NCO design using Narrow Angle Mapping Technique could enhance operational precision, provides higher speed operation, lower power waste. Booth multiplier is used to ensure the high operation speed while reducing the consumption of hardware resources. A modified CIC decimator filter structure is proposed. The magnitude response of the filter is improved by using cosine prefilters, the complexity of the filter is reduced by using non-recursive parallel structure and it is steady. At last, the system is designed by VerilogHDL.