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Defense Intelligence Reference Document High-Frequency Gravitational Wave Communications

Defense Intelligence Agency · 57 pages · text from the file's own layer

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.

  • p. 5 …with the advantage that they cannot be shielded or shadowed by planetary masses. Plasma interference seen…
  • p. 21 …The PPF signal can be intercepted by electromagnetic-interference-shielded microwave receivers located on the x…
  • p. 25 …High-sensitivity shielded microwave receivers are located at each end of the x-axis each about…
  • p. 37 …for solar monitoring, whereas L2 is permanently shielded from the sun. 4.0 Future Potential 4…
  • p. 38 …being able to pierce the protective plasma shielding that may in the future be routinely used…
  • p. 39 …aid for interplanetary missions (with no planetary shielding) by mapping geoids in interplanetary space via long…
UNCLASSIFIED/ ,i, without being sensitive to a frequency of cm.
This is the minimum functionality required to constitute a communication link. Signal
strengths of the respective GW generators would need to be sufficient to overcome link
loss, coupling losses, and noises sources. Signal to noise considerations and link
budgets are covered in further detail in Section 3.1.
2.1 HFGW GENERATORS {TRANSMITTERS)
2.1.1 HFGW Generator Concepts
Several sources for HFGWs or means for their generation exist. The first generation
means is the same for gravitational waves (GWs) of all frequencies and is based upon
the quadrupole equation first derived by Einstein in 1918. A formulation of the
quadrupole that is easily related to the orbital motion of binary stars or black holes,
2
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