GPS IIR-15(M)
美国空军 · Delta II 7925-9.5 · 17A 号发射工位 (SLC-17A)
任务简介
GPS-IIR 补充卫星由通用电气 Astrospace（后为马丁·玛丽埃塔和洛克希德导弹与航天公司）根据 1989 年签订的合同生产，合同包括 21 颗基于商用 AS-4000 平台的卫星。与早期型号的 GPS 卫星相比，这些卫星提供了更高的导航精度和更长的自主运行时间。卫星采用三轴稳定，下行链路频率为 1572.42 MHz 和 1227.6 MHz（L 波段）以及 2227.5 MHz（S 波段）。洛克希德负责 GPS-IIR 的发射和飞行操作支持，直至 2006 年。
原文
The GPS-IIR replenishment satellites are produced by General Electric Astrospace (later Martin Marietta and Lockheed Missiles & Space) under a contract issued in 1989, which included 21 satellites based on the commercial AS-4000 bus. These provided improved navigation accuracy and longer autonomous satellite operation than earlier model GPS satellites. The satellites were three-axis stabilized and operated at downlink frequencies of 1572.42 MHz and 1227.6 MHz (L-Band) and 2227.5 MHz (S-Band). Lockheed was responsible for launch and flight operations support of the GPS-IIR through 2006.
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