摘要
文中针对星载高动态大频偏数字解调技术中的载波同步、位同步等问题进行了推导和分析。提出了详细的跟踪环路参数的确定及设计方法,并进行了系统的仿真,得到了环路增益和带宽的数学推导结果及重要参数的确定方法。系统测试结果表明,跟踪环路及位同步的计算方法经测试证明是正确的、可靠的,分机满足实际载波跟踪和数字解调的动态特性要求。
In order to improve the problems in the technologies of IF digital demodulation in satellite-lbased digital re- ceiver, such as carrier synchronization, bit synchronization, and so on, a scheme for QPSKcarrier recovery using FPGA over satellite is proposed. In this paper, the design of second-lorder digital PLL is described, and the mathematical calculation method for bandwidth and gain of IF digital carriertracking loop is proposed. The results of system experiment indicate that the calculating method is right and reliable. The device could satisfythe requirement of dynamic characteristics for carrier tracking and digital demodulation.
出处
《空间电子技术》
2015年第4期62-65,共4页
Space Electronic Technology
关键词
星载解调
载波跟踪
位同步
大动态
Satellite-lBaseddemodulation
Carrier Tracking
Digital carrier tracking loop
High dynamic characteristics
