【摘要】：討論了TM65m射電望遠(yuǎn)鏡Ku、K、Ka和Q4個(gè)高頻段天線效率、靈敏度以及系統(tǒng)噪聲溫度的性能測(cè)量工作.首先介紹了TM65m接收系統(tǒng)4個(gè)高頻段的關(guān)鍵指標(biāo),接著對(duì)測(cè)量工作中需要注意的方面進(jìn)行了論述,主要包括望遠(yuǎn)鏡指向和副面位姿模型的構(gòu)建、噪聲源的定標(biāo)以及大氣的影響.最后給出了TM65m在這4個(gè)頻段的天線效率、靈敏度以及系統(tǒng)噪聲溫度的實(shí)測(cè)結(jié)果.測(cè)量結(jié)果表明:在最佳俯仰角45°-65°范圍內(nèi),Ku、K、Ka和Q4個(gè)波段天線效率均可以達(dá)到約50%,而在較高和較低的俯仰角上,由于主面變形的緣故,效率有明顯的下降現(xiàn)象.當(dāng)俯仰角為50°左右時(shí),4個(gè)波段的靈敏度分R%為38 Jy、120 Jy、200 Jy和110 Jy.
[Abstract]:The measurement of antenna efficiency, sensitivity and system noise temperature of TM65m radio telescope Ku,K,Ka and Q4 high frequency bands are discussed in this paper. This paper first introduces four key indexes of TM65m receiver in high frequency band, and then discusses the aspects that should be paid attention to in the measurement work, including the construction of telescope pointing and sub-plane pose model, the calibration of noise source and the influence of atmosphere. Finally, the measured results of antenna efficiency, sensitivity and system noise temperature of TM65m in these four bands are given. The measurement results show that in the range of 45 擄-65 擄of optimal pitch angle, the efficiency of Ku,K,Ka and Q4 band antennas can reach about 50%, but at higher and lower pitch angles, the efficiency decreases obviously due to the deformation of the main plane. When the pitch angle is about 50 擄, the sensitivity of the four bands is 38 Jy,120 Jy,200 Jy and 110 Jy., respectively.
【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;上海市空間導(dǎo)航與定位技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11303076、U1531135)資助
【分類號(hào)】：P111.44
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本文編號(hào)：2404701