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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Global Positioning System(GPS)is a satellite navigation system designed to provide instantaneous three-dimensional position infbrmation almost anywhere on the globe at any time, and in any weather .

GPS全球定位系统以其全球性、全天候、实时定位等优点显示出强大的生命力和竞争力，在航空、航天、航海及许多民用领域有着广泛的应用。

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It can provide some reference worth to expand the application field of Software Radio and study the framework of the Satellite Positioning and Navigation receiver system.

这对开拓软件无线电的应用领域和卫星定位导航系统接收机结构的研究有一定的参考价值。

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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