通信分析仪中实时频率模板触发捕获技术研究

Study of real-time frequency mask trigger capture technology in communication analyzer

在通信分析仪中,频率模板触发要求系统把数字下变频后的数据能进行实时的FFT变换,把已获得的频谱形状与用户定义的模板在电平两个方向上进行比较,使得可以捕获某个敏感频段内的小信号。本文提出了频率模板触发在Virtex-5内部的实现方法,其内部资源丰富,运算能力强大,并且针对高性能逻辑进行了优化。FFT CORE功能强大,在系统优化下可以实现实时的FFT变换,并通过仿真验证了它的正确性和实时性,具有很好的参考价值。

In Communication Analyzer,Frequency Mask Trigger technical requirements DDC transformed data of the system to real-time FFT,The shape of the spectrum which has been got compared with the user-defined level in both directions,that makes to capture a sensitive small-signal frequency band possible.This paper Proposes the Implementation of the frequency mask trigger within the Virtex-5,which has rich internal resource,Strong computing power,and optimized for high-performance logic.Powerful FFT CORE can achieve real-time FFT in the optimization system,and simulation results show its correctness and real-time,so this paper has good reference value.