【摘要】：GCRS(Geocentric Celestial Reference System,地心天球參考系)與ITRS(International Terrestrial Reference System,國(guó)際地球參考系)之間的坐標(biāo)轉(zhuǎn)換方法與歲差章動(dòng)模型密切相關(guān),IERS(International Earth Rotation and reference systems Service,國(guó)際地球自轉(zhuǎn)與參考系服務(wù))規(guī)范先后推薦了3組不同的歲差章動(dòng)模型。論文分析了基于春分點(diǎn)的坐標(biāo)轉(zhuǎn)換過(guò)程,在比較3組歲差章動(dòng)模型間差異的基礎(chǔ)上,以太陽(yáng)系10個(gè)天體為例,計(jì)算了歲差章動(dòng)模型更新、極移、世界時(shí)與地球時(shí)差值等因素對(duì)坐標(biāo)轉(zhuǎn)換影響的具體數(shù)值。結(jié)果表明,IAU 2006歲差-IAU 2000AR06章動(dòng)與IAU 2000歲差-IAU 2000A章動(dòng)間的差異,對(duì)坐標(biāo)轉(zhuǎn)換的影響在0.5mas以內(nèi);而IAU1976歲差-IERS 1996章動(dòng)與前2組歲差章動(dòng)間的差異,對(duì)坐標(biāo)轉(zhuǎn)換影響的最大值達(dá)到37mas;極移對(duì)坐標(biāo)轉(zhuǎn)換影響的最大值達(dá)到0.6″,遠(yuǎn)高于歲差章動(dòng)模型更新所帶來(lái)的影響;當(dāng)忽略世界時(shí)與地球時(shí)的差異時(shí),結(jié)果完全錯(cuò)誤。通過(guò)此分析,明確了極移、世界時(shí)與地球時(shí)的差異對(duì)坐標(biāo)轉(zhuǎn)換影響的具體數(shù)值,可為工程計(jì)算中歲差章動(dòng)模型的選取提供參考依據(jù)。
[Abstract]:Coordinate transformation method between GCRS (Geocentric Celestial Reference System, geocentric celestial sphere reference system and ITRS (International Terrestrial Reference System, international earth reference system) and precession nutation model are closely related to, IERS (International Earth Rotation and reference systems Service, international earth rotation and reference system service) specification Three groups of precession nutation models were recommended. In this paper, the coordinate transformation process based on the Spring Equinox point is analyzed. On the basis of comparing the differences among three groups of precession nutation models, taking 10 celestial bodies in the solar system as an example, the precession nutation model updating and polar shift are calculated. The specific value of the effect of the difference between Universal time and Earth time on coordinate conversion. The results show that the difference between IAU 2006 precession-IAU 2000AR06 nutation and IAU 2000 precession-IAU 2000A nutation is within 0.5mas, while IAU1976 precession-IERS 1996 nutation is different from IAU 2000 precession nutation. The maximum value of the influence on coordinate conversion is 37 mass, and the maximum value of polar shift on coordinate transformation is 0.6 ", which is much higher than that of precession nutation model updating. When the difference between the world and the earth is ignored, the result is completely wrong. Through this analysis, the specific value of the influence of polar shift, world time and earth time on coordinate transformation is determined, which can provide a reference for selecting precession nutation model in engineering calculation.
【作者單位】： 河南理工大學(xué)測(cè)繪與國(guó)土信息工程學(xué)院;中國(guó)科學(xué)院上海天文臺(tái);
【基金】：國(guó)家自然科學(xué)基金(No.41474021)
【分類號(hào)】：P126.5;P226.3

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