A new spectrum measurement trigging method and its implementation
Liu Bang-qiang, Qian Wang, Yan Xiao, He Ling · 2013
A new spectrum analysis trigger algorithm-Digital-phosphor trigger used for transient signals capturing is introduced. Digital-phosphor trigger is the extension of Digital-phosphor display algorithm, firstly recording the spectrum situations of signals over a period of time by dynamic Digital-phosphor picture, and then using the three-dimensional information consisted of signals-frequency, power and Digital-phosphor displaying density as the trigging masks to trig and capture signals. Digital-phosphor trigger algorithm won't be limited by the trigging masks form like one dimensional or two dimensional trigger algorithm. By the practical engineering verification based on FPGA (Field Programmable Gate Array), when system's AD sampling frequency reaches 51.2MHz and FPGA global clock reaches 204.8MHz, Digital-phosphor trigger can precisely trig and capture any transient signals with duration ≥40us, which performs better than existing trigger algorithms. With the promotion of system configurations, Digital-phosphor trigger can trig and capture transient signals with shorter duration.