In the satellite navigation and positioning system, Doppler shift is one of the key problems that may degrade the performance of the satellite receiver.

在卫星导航定位系统中，多普勒频率偏移是影响接收机性能的关键因素之一。

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The determination method of sea surface topography is important for sea users to improve the positioning accuracy with the double satellite navigation and positioning system.

海面地形的确定方法研究对提高双星导航定位系统海面用户定位精度具有重要意义。

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So, it is very important for us to do some research on the satellite navigation and positioning system antenna especially on the broadbandization and miniaturization technology.

而研究卫星定位系统终端使用的天线具有重要的价值与意义，特别是天线的宽带化、小型化技术。

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Each onboard ADS-B set consists of a Global Positioning System satellite navigation unit, two Pentium microprocessors, some software and a radio transmitter-receiver--not much more gear than you would find behind the dash of a new Cadillac.

FORBES: Free flight

She said that US diplomats and scientists should ensure that the Global Positioning System should become the world's standard satellite navigation system.

BBC: Albright marries science and diplomacy