海军的先锋卫星发射器；

the Navy's Vanguard satellite launcher;

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在理论研究和分析的基础上，设计了基于GPS信号的伪卫星发射器。

GPS pseudolite transmitter is designed based on systemic research and analysis.

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巴克博士认为难题是要降低小型卫星发射器的成本至几百万美元。而且他很可能离开老东家加盟维珍银河，他为此兴奋不已。

Dr Baker says the challenge is to get the cost of a small-satellite launcher down to a few million, and he is so excited by the possibilities that he is leaving his employer to join Virgin Galactic.

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