綜合孔徑射電望遠(yuǎn)鏡中鎖幅環(huán)的增益抖動(dòng)
VARIATION OF GAIN OF THE GAIN-LOCK LOOP IN A SYNTHETIC RADIO TELESCOPE
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摘要: 本文介紹了一種綜合孔徑射電望遠(yuǎn)鏡上的增益控制環(huán)路,并詳細(xì)討論了噪聲對(duì)增益起伏的影響。文章介紹了鎖幅環(huán)的基本性質(zhì),推導(dǎo)了噪聲功率與增益均方抖動(dòng)之間的關(guān)系式。推導(dǎo)了環(huán)路失鎖門限,并畫出了實(shí)驗(yàn)驗(yàn)證的結(jié)果。最后討論了減少噪聲影響的一些措施。
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關(guān)鍵詞:
Abstract: In this paper, a gain control loop which operates in synthetic radio telescope is described. The influence of noise on the variation of the gain is discussed in some details ; the gain-lock loop is described; the relation between noise power and variation of gain is derived; the formula for determining the threshold of unlocking is given and the experimental results are displayed in Fig. 6 and Fig. 7. In this paper, the steps taken to decrease the influence of noise are also discussed. -
鄭繼禹、萬(wàn)心平、張厥盛,鎖相環(huán)路原理與應(yīng)用,人民郵電出版社,1976,第144頁(yè).[2]劉以嵩,北京天文臺(tái)臺(tái)刊,1977,第9期,第60頁(yè).[3]陸道政、季新寶,自動(dòng)控制原理及設(shè)計(jì),上海科學(xué)技術(shù)出版社,1978. -
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