Documents / Report
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.
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UNCLASSIFIED//509 QFFHiIJl1k 1!181!! 8HL'f 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 H FGW Applications ............................................................. 36 iii UNCLASSIFIED/ /FAR AFFIGI11J.k 1!181!! eut I
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 57 pages are in the text index: search them above, or from the library's search.