Galileo系统及其在中国的应用

较详细地介绍了Galileo系统的全面体系结构、频率设计、服务内容及其广泛的应用范围，指出了它与GPS系统相比的优点，并对开发和增强Galileo系统在我国多层次、全方位的应用提出了建议。     

Galileo E1 OS信号捕获方法研究

为了获得较好的捕获性能,解决 Galileo E1 OS（开放服务）信号捕获过程中遇到的2个问题：信号功率利用不够充分,以及捕获结果的多峰错锁与相位模糊问题,设计了一种利用BPSK-like 技术的双通道信号捕获方法。将此方法应用于实测信号,捕获结果主峰明显、几乎无旁瓣,捕获性能理想。     

Galileo系统和区域增强导航系统的定位误差比较

采用最小二乘协方差方法分别对Galileo系统的定位误差和中国区域导航增强系统的定位误差的计算进行定义,并通过matlab编程仿真比较得出:区域增强导航系统的定位误差只有Galileo系统定位误差的三分之一。表明,如果能建立区域增强导航系统将在较大程度上提高中国区域的导航能力。     

NTSC时频比对中的Galileo E3总时延校准

为了提升时间传递链路的可靠性, 国际权度局(Bureau International des Poids et Mesures, BIPM)自\lk2020年起将Galileo时间比对正式作为UTC (Coordinated Universal Time)计算的备份链路, 因此对接收机Ga-lileo信号时延校准是全球各守时实验室参与UTC链路的必要工作. 以德国物理技术研究院(Physikalisch-Tech-nische Bundesanstalt, PTB)和中国科学院国家授时中心(National Time Service Center, NTSC)已校准的GPS (Global Positioning System)链路为参考, 将PT09接收机设为参考站, 对NTSC的NT02和NT05两台不同型号接收机的Galileo E3 (Galileo E1&E5a)总时延进行校准并验证. 结果表明: NT02和NT05 Galileo E3总时延分别为74.6ns和46.5ns, 校准不确定度均为3.5ns, 且校准时延比较稳定; NT02和NT05校准后与其他守时实验室已校准接收机的GPS P3和Galileo E3链路的共视比对结果基本一致; 以NTP3与其他实验室接收机GPS P3链路的共视比对结果为参考, 其偏差均值均小于1.5ns, 在校准不确定度范围内.     

Exploration of the Outer Planets:The Galileo and Cassini Missions

the space age has brought spectacular advances in our knowledge of the solar system.The flyby observations of the outer planets by the Voyagerspacecraft have been crost fruitful.These discoveries are now to be supple-mented by the Galileo Oribter to Jupiter and the Cassini Orbiter to Saturn.After the successful operations of the atmospheric probe in December 1995,the Galileo spacecraft is now in orbit around Jupiter and its comprehensive scientific observations of the Jovian system have just commenced.The Cassini spacecraft with the Huygens atmospheric probe to Titan will be launched in 1937 with an arrival date at Saturn in 2004.If everything goes well,these two projects will be followed by a Pluto Express mission for fast flyby reconnaissance and a Neptune Orbiter.     

Galileo’s telescope: history, scientific analysis, and replicated observations

In the summer of 1609, Galileo Galilei started to improve upon the Dutch spyglass. Only a few months were needed to increase the magnifying power of the instrument up to 30 times. This transformation allowed Galileo to perform astronomical observations destined to change the traditional Universe. At present, the Institute and Museum of History of Science of Florence is conducting a research programme on the lenses of early telescopes. Historical research is combined with scientific analyses conducted by the National Institute of Applied Optics in Arcetri, the National Institute of Nuclear Physics in Florence, and the Glass Experimental Station in Murano. The shape and composition of the lenses are studied by applying different techniques. Moreover, the composition of early lenses and scientific glass objects are compared. Finally, Galileo’s observations are checked with an optical replica of Galileo’s telescope held at the Astrophysical Observatory in Arcetri.