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This Defense Intelligence Reference Document was prepared by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) program, is dated 6 April 2010 and is part of a series of advanced technology reports produced in FY 2009. It reviews proposed laboratory generators and detectors of high-frequency gravitational waves for communications. It favors an infrared-excited molecules transmitter and the Li-Baker detector, estimating about 1.9 million bits per second over 7,000 km through the Earth. It also discusses timing standards and interplanetary navigation uses.
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UNCLASSIFIED//5O9 QFFHII0k Yi& o•lk¥ 4.3 INTERPLANETARY NAVIGATION AND GEOID MAPPING TO 2050 While there is no doubt that stellar tracking will remain the primary source of navigation for space missions in the foreseeable future, as introduced in Section 3.4.2, HFGW may also prove useful in conjunction with RF in providing a navigation aid for interplanetary missions (with no planetary shielding) by mapping geoids in interplanetary space via long baseline navigation. For instance, if there were one GW source on Earth, and one GW source on the Moon, such a pair of GW sources would provide relative beacons for missions to Mars that could serve multiple roles as navigation beacons, communication relays, and in conjunction with RF signals, map geoids via relative time difference of arrival signals. Very Long Baseline Navigation could be achieved by placing a source on Earth and one GW source on Mars for a baseline that would most often be very widely spread with respect to the outer planets, for outer planetary missions. See Figures 25-27 for a number of different navigation beacon pair options. R, = 6378 km x2 = diameter R10 = 384,400 km = .00257 AU cw, .,,.. .---- ' ;,,-~, Earth Figure 25. A GW Pair on Earth as Used by a Lunar Mission 34 Moons 0mm - 2Re / R10 rad ;;.·2 degrees UNCLASSIFIED/ /f81il 8ffl@Itltt ""I! one I
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 57 pages are in the text index: search them above, or from the library's search.