摘要
从圆波导多模单信道自跟踪原理出发,提出了一种跟踪无载波调角信号的圆波导多模自跟踪系统单信道合成方案,该方案不需要对差信号进行四相调制(QPSK),用7位数字移相器或3 dB 90°电桥实现对差信号进行0°,90°分时移相。因而降低了跟踪接收机成本,实现程序也较四相调制方案简单。实践证明,该方案是可行的。
This paper introduces a singal channel synthesis scheme of circular waveguide multimodes autotracking for tracking no-carrier angular modulation signals. The scheme needs no QPSK to difference signal, the time division phase shifting for 0°,90° to diference signal is realized with 7 b digital phase shifter or 3 dB 90°bridge. Therefor the cost of autotracking receiver is reduced. The scheme is demonstrated practicable.
出处
《现代电子技术》
2007年第19期74-76,共3页
Modern Electronics Technique
关键词
无载波信号
单信道合成
跟踪接收机
QPSK
no - carrier signal
single channel synthesis
autotracking receiver
QPSK
