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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.
UNCLASSIFIED//iiOlil OiiiilCI0L Llili QPIL¥ Appendix A: Nomenclature A amplitude of gravitational wave, metric strain in spacetime, m/m B bandwidth, s-1 B magnetic field strength, Tesla C speed of light in vacuum (2.998 x 108 ms-1) C maximum rate of information transfer, bits per second (bps), s- 1 dt time of future measurement, s E effective energy contained within the detector cavity summed over the detection averaging time, J FGw gravitational-wave flux, Wm- 2 h strain, m/m hdet (strain) detection limit, m/m i] Planck's reduced constant 1.055 x 10-34 Js N noise, wm-2 N number of linearly arranged GW radiation elements, integer Nphase number of phase space cases to check for acquisition, integer Ntreq number of frequency cases to check for acquisition, integer Ncode number of code sync possibilities to check, integer n number of pairs of oppositely jerking at one-time mass elements, integer p power of the generated gravitational waves, W Q temporal quality factor or selectivity of the signal-to-noise ratio, dimensionless R range, m Rcvrl receiver 1 Rcvr2 receiver 2 Rr receiver antenna power efficiency, dimensionless Rx. radiated power efficiency, dimensionless s signal strength, wm-2 Si input signal strength, wm-2 So output signal power, W r distance between two jerking-mass, gravitational-wave radiation elements, m T propagation or transmission-factor losses, dimensionless ta acquisition test time per test case, s tint integration or signal averaging time, s Xmit1 transmitter 1 Xmit2 transmitter 2 b,.f change in force of a jerking-mass, gravitational-wave radiation element, N b.p momentum uncertainty, kg-ms-1 b.t time interval, s D..x initial position uncertainty, m conversion efficiency (ratio of power of the EM input signal to power of the GW signal generated), dimensionless conversion efficiency (ratio of power of the GW input signal to power of the EM signal generated), dimensionless wavelength, m VGW gravitational-wave frequency, s-1 (j) frequency of sensed gravitational waves, s-1 W1 transmitting frequency, s- 1 W2 receiver-sensitivity frequency, s-1 44 UNCLASSIFIED/ /FOR OiiiilCl.t.k HSI!! eflti
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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.