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This Defense Intelligence Reference Document, DIA-08-1004-005, is dated 6 April 2010. The Defense Intelligence Agency's Defense Warning Office prepared it under the Advanced Aerospace Weapon System Applications program. It reviews proposed laboratory generators and detectors for high-frequency gravitational waves. It favors a piezoelectric approach for proof-of-concept tests, IR-excited molecules for an operational transmitter and the Li-Baker detector as the receiver. It estimates about 1.9 million bits per second over 7,000 km through the Earth and discusses timing standards and interplanetary navigation uses.
From the source: Release of 2026-09-18 Incident: 4/6/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines whether high-frequency gravitational waves could serve as a communications medium while avoiding the attenuation that limits radio-frequency systems. The report surveys proposed transmitter and detector concepts, argues that gravitational-wave communications could support secure point-to-point links, timing standards, and interplanetary navigation, and gives particular attention to laboratory generator concepts and the Li-Baker detector as possible building blocks for such a system. The document makes clear, however, that the entire concept depends on capabilities that had not been demonstrated in practice, including laboratory-scale generation and reliable detection of usable high-frequency gravitational-wave signals. It is an exploratory systems-oriented review built around a future communications concept.
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Signal (PPF) and Noise (BPF)
have very different physical behavior
PPF > BPF at this end of x-axis
Very Noisy
(BPF)
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Poynting Vector or
Detection
Photons (PP )
/
/
Poynting Vector or
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Detection
X
otons (P F)
..
Signal (PPF) and Noise (BP F)
have very different physical behavior
PPF > BPF at this end of x-axis
GW&E
Synchro-Resonant
Figure 12. Detection Photons Sent to Locations That are Less Affected by Noise
The synchro-resonance solution of Einstein's field equations [Li et al. (2008), pp. 411 to
413] is radically different from the Gertsenshtein (1962) effect. The newer Li-Effect
solution utilizes a coupling between EM and gravitational waves (Li, Tang and Zhao,
1992) t hat arises according to the theory of relativity. And a strong static magnetic field
in the y-direction, B, is superimposed upon a GW propagating in the z-direction, as in
the inverse Gertsenshtein effect. However, with the Li-Effect, there is an additional
focused microwave beam ("Gaussian beam") at t he expected frequency, phase and
bandwidth of the HFGWs in the same direction (z) as the GW (as shown in Figure 12).
Unlike the Gertsenshtein effect, a first-order perturbative photon flux (PPF), comprising
the detection photons, will be generated in the x-d irection. Since there is a 90 degree
shift in direction, there is little crosstalk between the PPF and the superimposed EM
wave (Gaussian beam), so the PPF signal can be isolated and distinguished from the
effects of the Gaussian beam, enabling detection of the GW.
Here's how it works:
The perturbative photon flux (PPF), which signals t he detection of a passing
gravitational wave (GW), is generated when the two waves (EM and GW) have the
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 57 pages are in the text index: search them above, or from the library's search.