第二章坐标系统与时间系统
绝对时空观:
相对论时空观:时空度规
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天球坐标系: 便于描述人造地球卫星的在轨位置; 地球坐标系: 便于描述地面点的位置.
坐标系统
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天球坐标系 ICRS
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The International Celestial Reference Frame (ICRF) realizes an ideal reference system, the International Celestial Reference System (ICRS), by precise equatorial coordinates of extragalactic radio sources observed in Very Long Baseline Interferometry (VLBI) programmes.
Equatorial coordinates of 608 extragalactic radio sources in observed with VLBI ,1998年1月1日起开始使用。
天球参考架 ICRF
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地球坐标系 ITRS
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地球参考架 ITRF
ITRS is realised by the International Terrestrial Reference Frame (ITRF) based upon estimated coordinates and velocities of a set of stations observed byVLBI, LLR GPS, SLR, and DORIS. The ITRS can be connected to the International Celestial Reference System (ICRS) by use of the IERS Earth Orientation Parameters (EOP).
The x and y coordinates of the EOP are Celestial Ephemeris Pole (CEP) relative to the IRP(IERS Reference Pole).
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ITRF序列
ITRF89:
ITRF90:
ITRF91:
ITRF92:
ITRF93:
ITRF94:
ITRF96:
ITRF97:
ITRF2000:
ITRF2005:
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IGS坐标框架: Igs00, IGb00
After ITRF2000 was made available in early 2001, a realization of the frame was prepared using the cumulative solution from GPS week 1131, It is
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