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第一節(jié) GPS系統(tǒng)
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GPS系統(tǒng)空間部分由21+3顆衛(wèi)星組成,分布在6個(gè)接近圓形的軌道面上,軌道傾角為55°。軌道離地面的高度約為20200km,相應(yīng)的軌道橢圓長半軸為26600km。軌道運(yùn)行周期為12恒星時(shí),相對(duì)于協(xié)調(diào)世界時(shí)每天提前約4min。地面控制部分包括主控站( （共 820 字） [閱讀本文] >>

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