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Defense Intelligence Reference Document High-Frequency Gravitational Wave Communications
Defense Intelligence Agency · 57 pages · text from the file's own layer
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.
“The Times”28 pages
- p. 3 …the FTS Devices ............................................. 30
3.4.1 Propagating Signals From Optical Lattice Clocks for Timing ................ 31…
- p. 4 …Omni-Directional Nature of the HFGW Radiation Pattern ....................... 10
Figure 8. Predicted Relic GW Energy Density…
- p. 5 …The Piezoelectric Approach to HFGW generation is best for the proof-of-
concept test and the…
- p. 6 …Antennas, cables, and phone lines
would be things of the past. A timing standard alone, provided…
- p. 8 …over the time interval !1t, s; that is, the jerk or shake of the two
masses…
- p. 9 …The usual difficulty with
HFGWs generated by nuclear reactions is the small dimensions of their nuclear…
- p. 22 …the initial momentum
uncertainty, dt is the time of the future measurement, and m is the…
- p. 23 …Eis the effective
energy contained within the detector cavity summed over the detection averaging time,
and…
- p. 24 …The temporal quality factor in the Li-Baker detector arises from averaging the signal
over time…
- p. 28 …Another way to increase Q is to arbitrary increase sample times of the signal. This
technique…
- p. 29 …There is also a hidden integral here which occurs over the sample time, which is
understood…
- p. 30 …3.3 FREQUENCY AND TIME STANDARD
The first application of HFGW to the distribution of frequency…
- p. 31 …The arrival times of the received PPS signals could be compared via
time difference of arrival…
- p. 32 …The universal nature of the
HFGW frequency and time standards are especially helpful. The following
telecommunication…
- p. 33 …the search space is reduced, speeding
acquisition.
• Ultra-fast acquisition allows more efficient TDMA, or Time…
- p. 34 …For a 5 μsec acquire test time, the result is Tacq = 150 x 150 x 16…
- p. 35 …At this precision one could measure the time delay caused by changing
once centimeter in height…
- p. 36 …the problem of mapping the positions of
the Lagrangian points, which vary slightly over time.
3…
- p. 38 …As prototypes show promise they could be transitioned to device
development, the first time that industry…
- p. 39 …For instance, if there were one GW
source on Earth, and one GW source on the…
- p. 41 …Nonlinearity
improves the focusing process and h goes to one in finite time, producing a singularity…
- p. 45 …and Stephenson, G.V. (2007), "The Value Estimation of an HFGW Frequency
Time Standard for Telecommunications…
- p. 46 …Thesis, The University of Birmingham, January.
Kippenberg, T. J. and Vahala, K. J. (2008), "Cavity Optomechanics…
- p. 49 …time of future measurement, s
effective energy contained within the detector cavity summed over the detection…
- p. 50 …The project plan and
timing are described below under separate headings for each component of the…
- p. 51 …coils that superimpose upon the constant applied
magnetic field a time-varying component at low frequency…
- p. 53 …photon events, and has very good time resolution.
The disadvantage is its cost and complexity. This…
- p. 55 …Cryogen-free (more accurately, the cryogen is completely
enclosed and re-cycled each time the magnet…
UNCLASSIFIED/ ;reR: 8Pfl81Ak Wilii ODIi X
High-Frequency Gravitational Wave Communications
Prepared by:
l(b)(3):10 USC 424
Defense lntell1gence Agency
Author:
(b)(6)
Administrative Note
COPYRIGHT WARNING: Further dissemination of the photographs in this publication is not authorized.
This product is one in a series of advanced technolo re orts roduced in FY 2009
under the Defense Intelligence Agency, (b)(3):10 USC 424 dvanced Aerospace
Weapon System Applications (AAWSA) rogram. ommen s or questions pertaining to
this document should be addressed to (b)(3):10 USC 424· b 6 , AAWSA Program
Manager, Defense Intelligence Agency, ATTN: (b)(3):10 use 424 Bldg 6000, Washington,
DC 20340-5100.
" UNCLASSIFIED/ I f81il 8FFIEICP l!Slii ONI X
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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.