微波四相調(diào)制的分析與動態(tài)觀察法
AN ANALYSIS AND A DYNAMIC TESTING METHOD OF MICROWAVE QPSK MODULATION
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摘要: 本文采用步進轉(zhuǎn)動(順時針或逆時針)的信碼作信源,分析了廣義四相調(diào)制的特性,給出調(diào)制信號的頻譜和兩調(diào)相電路間的導(dǎo)納關(guān)系表達式,計算了幾種典型四相調(diào)制頻譜的實例,據(jù)此可判定調(diào)制的效果和相位誤差,并用于動態(tài)測試中對四相調(diào)制器進行調(diào)整,實驗表明測得的結(jié)果與理論計算是相符的。本文還報道了X波段四相調(diào)制器的實驗情況,測得其最大相位誤差小于4,相讓精度可達0.1,插入損耗小于4dB,傳送數(shù)據(jù)率可達 34Mb/s。
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關(guān)鍵詞:
Abstract: Using the clockwise or anticlockwise stepping pulse code signal, the characterities of general QPSK modulation are analysed. The spectrums in several operational conditions and the admittance formulas of related two modulation circu ts are given. Several typical examples of QPSK modulation are calculated. The results are used to decide the modulation effect and phase error, and also to adjust the QPSK modulator under the dynamic testing. The experimental results are in agreement with the theortical calculations. An X band QPSK modulator is also presented. the maximum phase error is less than 4, insertion loss less than 4 dB, phase accuracy near 0.1 and transmission data rate up to 34 Mb/s. -
W. O. Schlosser and K. Kurokanwa, IEEE Trans. on MTT,MTT-20(1972), 614. -
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