Based on the principle of the ultrasonic cross - correlation flowmeter , the key factor of the development of cross - correlation flowmeter , namely the design of cross - correlator , is analyzed in the paper . digital signal processing is introduced to design the flowmeter , the cross - correlation operation of random noise signal is dealt with inside the frequency field , and the digital cross - correlator is designed 本文從超聲相關(guān)流量計(jì)的工作原理出發(fā),分析了超聲相關(guān)流量計(jì)研制的關(guān)鍵因素,即相關(guān)器的設(shè)計(jì),并將數(shù)字信號(hào)處理技術(shù)引入了超聲相關(guān)流量計(jì)的設(shè)計(jì),在頻域內(nèi)對(duì)流動(dòng)隨機(jī)噪聲信號(hào)進(jìn)行相關(guān)處理,構(gòu)造了數(shù)字相關(guān)器。