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中国卫星海平面高度观测精度达毫米级 年均优于1mm
2017-08-20 01:26:12 中国青年网
近日,笔者从航天科工二院203所了解到,该所研制的雷达高度计铷原子钟鉴定件通过验收,性能指标均满足总体指标要求。这是我国首次将星载铷原子钟应用于海洋二号卫星,后续海洋二号卫星B星和C星都将采用铷原子钟。
据悉,海洋卫星过去是采用GPS锁定晶振方式,实时校准晶振的准确度,以实现测量数据的准确性。但这种方式一旦失去GPS信号,测量结果的准确性将大打折扣。采用铷原子钟,由于低漂移率,卫星整个寿命周期都不用校准,测量结果的准确性将大幅提升。
海洋二号卫星上铷原子钟的设计,延续了北斗卫星铷原子钟的设计,在铷原子钟相噪和杂散指标上进行了很大的提升。过去采用晶振,在同一区域测量海平面的年均高度误差是厘米级,而采用铷原子钟后,寿命期内测量高度误差精确到毫米级,年均优于1mm。
据了解,海洋二号是我国第一颗海洋动力环境观测卫星,具有全球观测能力,并且具备不受天气影响的微波观测功能。海洋卫星首次采用星载铷原子钟校准,全天时、全天候获取宝贵的海洋动力环境数据,极大提升了我国海洋监管、海权维护和海洋科研的能力。
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