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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//iiO lil OiiiilCI0L Llili QPIL¥ Contents Summary......................... .......... .... ...... ........ .......... ...... .......... ................ ........ ......... . v 1.0 Introduction .. .................................. ................................................................. 1 1.1 Introduction .................... ........ .... .... .. .... .... .. ........ .. ....................................... 1 1.2 Definition of High-Frequency Gravitational Waves ....................................... 1 2.0 HFGW Communications .................................................................................... 2 2.1 HFGW Generators (Transmitters) .... ........ .... .. .. ............................................. 2 2.1 .1 HFGW Generator Concepts ..... .. ................ ............................................. 2 2.1 .2 Alternative Approaches ........ .......... .. ...... ........... .................................... 6 2.1.3 Piezoelectric Approach .......................................................................... 6 2.1.4 Infrared-Excited Molecules Approach .................................................... 7 2.2 HFGW Detectors (Receivers) ...................................................................... 12 2.2.1 Alternative Approaches ....................................................................... 12 2.2.2 Concept (Li-Effect) .............................................................................. 14 2.2.3 Quantum Back-Action Limit ................................................................. 16 2.2.4 Li-Baker HFGW Detector...................................................................... 20 3.0 Operational Concerns ..................................................................................... 22 3.1 Link Budget ................................................................................................ 22 3.1.1 Signal-to-Noise Ratio .......................................................................... 22 3.1.2 Link Budget Considerations ................................................................. 23 3.2 Bandwidth .................................................................................................. 25 3.3 Frequency and Time Standard .................................................................... 25 3.3.1 Improvements Accruing from a HFGW Time Standard ......................... 27 3.3.2 Search Space Improvement Accruing From HFGW FTS ........................ 28 3.3.3 The Impact of Phase Noise Improvements on Phase Shift Encoding ... 29 3.3.4 The Impact of Frequency Noise Improvements on FDMA and FHSS..... 30 3.4 Possible Future Upgrades to the FTS Devices ............................................. 30 3.4.1 Propagating Signals From Optical Lattice Clocks for Timing ................ 31 3.4.2 In Navigating and Mapping Interplanetary Geoids .............................. 31 4.0 Future Potential ............................................................................................. 32 4.1 Developmental Roadmap ............................................................................ 32 4.2 HFGW Communications Predictions to 2050 ............................................... 33 4.3 Interplanetary Navigation and Geoid Mapping to 2050 .............................. 34 4.4 Other Possible HFGW Applications ............................................................. 36 UNCLASSIFIED/ /FOR OiiiilCl.t.k HSI!! eflti iii
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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.