systemview在通信工程實驗中的應(yīng)用(更新版)
【正文】 dynamic systems analysis environment for the design and simulation of engi2neering or scientific systems1 From analog or digital signal processing , filter design , control systems , and municationsystems to general mathematical systems modeling , SystemView provides a sophisticated analysis engine1 Using Sys2temView can make up the condition our school experiment budget shortage , improving the teaching munication engi2neering , and changing old teaching method , adapt to the society that now high speed development , make student real toadapt to the society demandKey Words : Communication Engineering 。23 伏) , 而VCO 在Sd ( t ) = 0時的振蕩頻率為ωo’, 則當(dāng)有控制電壓時, VCO的瞬時角頻率為ωv ( t) =ω0′+ KvS d ( t)令上兩式相等, 即ωv ( t) ≈ωFM ( t) , 可得Sd ( t) =ω0 ω0′Kv+kfkvf ( t)其中ωo 為FM 波的載頻, ωo’為壓控振蕩器的固有振蕩頻率, 兩者皆為常數(shù). 因此上式第一項為直流項, 可用隔直元件消除, 或者開始時已經(jīng)把壓控振蕩器的頻率調(diào)整為ωo = ωo’. 因此上式還可進一步寫成Sd ( t) ≈kfkvf ( t)可見, 鎖相環(huán)輸出, 除了常系數(shù)Kf / Kv 之外, 近似等于原調(diào)制波形f ( t ) , 因而達到頻率解調(diào)的目的鎖相環(huán)解調(diào)器的仿真的結(jié)果見圖2 ,圖2 : 鎖相環(huán)解調(diào)結(jié)果和輸入信號比較由圖2 可看出ViewSystem 強大的仿真功能,3 結(jié)論從應(yīng)用實例可以看出SystemView 具有以下優(yōu)點:311 能仿真大量的應(yīng)用系統(tǒng)第2 期 陳紹溴: SystemView 在通信工程實驗中的應(yīng)用 第27 卷__6 / 6
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