Design Of Trigger Module Of Multi Information Domain Synchronous Real-time Analyzer

multi information domain synchronous real-time analyzer,not only includes the built-in time-domain analysis function of digital oscilloscope,but also includes multi domain real-time synchronous analysis functions in frequency domain,time-frequency domain,modulation domain,amplitude domain,phase domain,statistical domain and so on.As an important module of the multi domain analyzer,the trigger module needs to be able to detect the multi domain synchronous multi-dimensional features of the measured signal or the measured signal group,so as to capture the signals that meet the user’s setting in real time.Based on the requirement of multi domain analyzer trigger module to observe the multi domain characteristics of the measured signal in real time and capture the characteristic signal,this thesis designs and implements a multi domain analyzer trigger module which can detect the multi-dimensional characteristics of the signal in real time.The trigger module of the multi domain analyzer can conduct real-time synchronous analysis on the multi domain information of the measured signal or the measured signal group,control the time-frequency domain data storage of the measured signal by using the secondary trigger method,locate the trigger point on the time-frequency domain data memory and capture the synchronous time-frequency domain data of the characteristic signal.The specific work of this thesis is as follows:1.On the frequency-domain channel of the multi domain analyzer,the power trigger function and the frequency template trigger function with flexible and adjustable analysis bandwidth are designed and realized.The real-time power and real-time spectrum of the measured signal are calculated through the I and Q signals after digital down conversion,and compared with the conditions set by the user,so as to capture the signal that meets the power or spectrum characteristics set by the user.Compared with the traditional oscilloscope,the trigger function is expanded from time domain to frequency domain.2.Based on the trigger mode in time-domain and frequency-domain channels,a time-frequency-domain joint trigger function for simultaneous feature detection of the time-frequency-domain information of the measured signal is designed and realized.This method calculates the relative delay of time domain trigger,power trigger and frequency template trigger,caches the trigger signal flag and trigger information with short delay,and then carries out multi domain analysis on the signal when the long delay trigger signal arrives,so as to realize the synchronous analysis of the multi domain characteristics of the measured signal,and then generates the joint trigger signal according to the analysis results and captures the signal meeting the multi domain joint characteristics.3.The synchronization of time domain and frequency domain data acquisition of measured signal controlled by trigger module is studied.The design of secondary trigger mode can effectively capture and store the time domain and frequency domain data of trigger time and the measured signal before and after trigger.Through the test,it is verified on the multi domain analyzer platform that the trigger module of this subject can monitor the signal power,frequency characteristics and multi domain joint characteristics,and control the acquisition system to store the timefrequency domain data of signal synchronization according to the trigger signal.