发行时间：2021.12.19
总页数：51
编辑：
综保科技
摘要：
united states government accountability office report to the committee on armed services, u.s. senate
may 2021
technology assessment
defense navigation capabilities
dod is developing positioning, navigation, and timing technologies to complement gps
gao-21-320sp
the cover image displays a compass with stylized representations of elements of positioning, navigation, and timing (pnt): satellites orbiting earth (upper-right); a clock face and an atomic fountain clock (lower-right); the electronics...
普通账号
