PSK解码同步电路的改进与实现

Improvement and implementation of PSK decoding synchronous circuit

PSK解调器是航天测量船船载遥测终端遥测解调单元的重要组成部分,该解调器中的码同步电路是实现遥测正常解调的基础。目前船载遥测终端PSK解调电路仍然采用数字锁相环技术。这里探讨采用一种新型电路代替数字锁相环,以提高电路对码同步的提取性能。并通过理论分析证明,新的改进方案优化了PSK解码同步电路的性能,提高了精度,扩展了带宽,缩短了时间,增强了可靠性。

PSK demodulator is an important composition of telemetering demodulation unit in telemetry terminal system mounted on spaceflight measuring ship, in which the code synchronous circuit is the key part to realize normal telemetering de- modulation. The digital phase-locked loop technique is still used in PSK demodulation circuit of shipborne telemetering termi- nal currently. In this paper, the digital phase-locked loop is replaced with a new type of circuit to enhance the ability of the circuit to extract code synchronization. The theoretical analysis shows that the improved solutions optimizes the performance of PSK decoding synchronous circuit, and have the advantages of higher precision, widened bandwidth, shorter time and high- er security.