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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¥ 4.5 2050 and Beyond ........................ .. ............................................................. 37 5.0 Acknowledgements ........................................................................................ 37 6.0 References ..................................................................................................... 37 Appendix A: Nomenclature ................................................................................... 44 Appendix B: Li-Baker HFGW Detector ................................................................... 45 Appendix C: Perturbative Photon Fluxes Generated By High-Frequency Gravitational Waves and Their Physical Effects .................................... 52 Figures Figure 1. Communication Link Block Diagram ........................................................ 2 Figure 2. Change in Centrifugal Force of Orbiting Masses, Afct, Replaced by Change Figure 13. Quantum Back Action as a Mechanism for Creating the Standard Figure 15. Fractal Membrane Component of Li-Baker Detector Exhibited in Planar Figure 24. HFGW Com Space Application Development Roadmap, Estimated Figure 27. A GW Pair on Earth and on Mars for an Outer Planetary Reference in Tangential Force, '1ft, to Achieve HFGW Radiation ............................... 3 Figure 3. Circular Resonator Geometry Using Infrared Excitation .......................... 8 Figure 4. Radiation Pattern Calculated by Landau and Lifshitz (1975) ................... 8 Figure 5. GW Flux Growth Analogous to Stack of N Orbital Planes ......................... 9 Figure 6. Stack of Circular-Wave-Guide Plates With Typical Molecule Jerks, Af's ... 9 Figure 7. Omni-Directional Nature of the HFGW Radiation Pattern ....................... 10 Figure 8. Predicted Relic GW Energy Density as a Function of Frequency ............. 11 Figure 9. Birmingham University HFGW Detector ................................................. 13 Figure 10. INFN Genoa HFGW Detector ................................................................ 13 Figure 11. The National Astronomical Observatory of Japan 100 MHz Detector ... 14 Figure 12. Detection Photons Sent to Locations that are Less Affected by Noise .. 15 Quantum Limit ..................................................................................... 17 Figure 14. Schematic of Ultra-Sensitive HFGW Detector....................................... 21 Form .................................................................................................... 21 Figure 16. Conceptual SNR Fill Factors: Signal and Noise Components ................ 23 Figure 17. A Block Diagram of a Typical Link Budget............................................ 24 Figure 18. A Proposed Near Earth Distribution of Frequency Time Standard........ 26 Figure 19. HFGW Supplemented Remote Terminal Design .................................... 27 Figure 20. Acquisition Search Space Improvement Accruing From HFGW FTS ...... 28 Figure 21. The Impact of Phase Noise Improvements on Phase Shift Encoding ... 29 Figure 22. The Impact of Frequency Noise Improvements on FDMA and FHSS ..... 30 Figure 23. The Earth's Associated Lagrangian Points ........................................... 31 Timeline .............................................................................................. 32 Figure 25. A GW Pair on Earth as Used by a Lunar Mission ................................... 34 Figure 26. A GW Pair on Earth and on the Moon, as Used by a Mission to Mars .... 35 Pair...................................................................................................... 35 UNCLASSIFIED/ /FOR OiiiilCl.t.k HSI!! eflti iv
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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.