本文選題：望遠(yuǎn)鏡 + 天文儀器　； 參考：《天文學(xué)報(bào)》2017年04期

【摘要】：基于天線軌道不平度對(duì)望遠(yuǎn)鏡指向的影響機(jī)理,測量并分析采用整體焊接軌道技術(shù)后的烏魯木齊南山26 m射電望遠(yuǎn)鏡(NanShan Radio Telescope,NSRT)天線軌道誤差的分布情況及對(duì)指向的影響,從而對(duì)指向模型進(jìn)行修正.采用移動(dòng)最小二乘法(Moving Least-Squares,MLS)將測得的天線軌道高度差擬合成一個(gè)閉合的軌道高度分布曲線,確定因軌道不平度影響的天線方位軸偏差,對(duì)比實(shí)測天線座架變形的方位軸偏差,發(fā)現(xiàn)二者具有較強(qiáng)的相關(guān)性.考慮到天線座架重力變形的偏差包含南北向和東西向偏差,建立新的指向偏差模型進(jìn)行校正.最后通過對(duì)已知校準(zhǔn)射電源進(jìn)行掃描測量,將指向偏差數(shù)據(jù)進(jìn)行擬合.結(jié)果表明:新建的指向修正模型能夠抑制已知指向模型偏差中的正弦分量,從而說明所建模型很好地反映了天線的指向偏差并對(duì)偏差具有一定修正作用.
[Abstract]:Based on the influence mechanism of antenna orbit irregularity on telescope pointing, the distribution of antenna orbit error of Shan Shan Radio TelescopeNSRT, a 26 m radio telescope in Nanshan, Urumqi, and its effect on pointing are measured and analyzed. In order to modify the pointing model. By using moving least-squares method (MLS), the measured orbit height difference is fitted into a closed orbit height distribution curve, and the azimuth axis deviation of antenna due to track irregularity is determined, and the azimuth axis deviation of antenna frame deformation is compared. It was found that there was a strong correlation between them. Taking into account that the deviation of gravity deformation of the antenna seat includes the deviations from the north to the south and the east to the west, a new directional deviation model is established to correct the deviation. Finally, by scanning and measuring the known calibrated radio source, the pointing deviation data is fitted. The results show that the new directional correction model can suppress the sinusoidal component of the known deviation of the pointing model, which shows that the proposed model can well reflect the pointing deviation of the antenna and has a certain correction effect on the deviation.
【作者單位】： 中國科學(xué)院新疆天文臺(tái);中國科學(xué)院射電天文重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);西安電子科技大學(xué)機(jī)電工程學(xué)院;電子裝備結(jié)構(gòu)設(shè)計(jì)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2015CB857100) 國家自然科學(xué)基金項(xiàng)目(11403089、51490660) 中國科學(xué)院天文臺(tái)站設(shè)備更新及重大儀器設(shè)備運(yùn)行專項(xiàng)經(jīng)費(fèi)(2014、2015)資助
【分類號(hào)】：P111.44

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