【摘要】：首先介紹了天馬65 m射電望遠(yuǎn)鏡(簡(jiǎn)稱TM65 m)接收系統(tǒng),包括L、S、C、X 4個(gè)頻段各部分的噪聲指標(biāo).然后對(duì)系統(tǒng)噪聲溫度的幾種測(cè)試方法進(jìn)行了討論;對(duì)影響系統(tǒng)噪聲溫度測(cè)量的若干關(guān)鍵因素進(jìn)行了分析,包括非線性誤差、饋源網(wǎng)絡(luò)插入損耗和失配誤差等.采用Y因子法對(duì)試驗(yàn)室的噪聲源定標(biāo)值進(jìn)行了校核,校核后偏差達(dá)到0.2 K左右.最后給出了TM65 m 4個(gè)低頻段系統(tǒng)噪聲溫度的實(shí)測(cè)結(jié)果,并進(jìn)行了分析.
[Abstract]:This paper first introduces the receiving system of Tianma 65m Radio Telescope (TM65 m), including the noise index of each part of four frequency bands. Then, several measurement methods of system noise temperature are discussed, and some key factors affecting system noise temperature measurement are analyzed, including nonlinear error, feed network insertion loss and mismatch error. The calibration value of the noise source in the laboratory was checked by Y factor method, and the deviation was about 0.2 K after checking. Finally, the measured results of noise temperature in four low frequency bands of TM65 m are given and analyzed.
【作者單位】： 中國(guó)科學(xué)院上海天文臺(tái);中國(guó)科學(xué)院射電天文重點(diǎn)實(shí)驗(yàn)室;桂林電子科技大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11303076)資助
【分類號(hào)】：P111.44
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本文編號(hào)：2265085