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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.
“BEAMS”17 pages
UNCLASSIFIED/ ,'f81l 81'1'U!llltt tl!!II!! 9HL"i' Appendix A: Nomenclature A B B C C dt E FGw h hdet ~ N N Nphase Nfreq Ncode n p Q R Rcvrl Rcvr2 R, R,. s s, S, r T ta tint Xmit1 Xmit2 M Lip Lit /Ix A VGW "WI w, 44 amplitude of gravitational wave, metric strain in spacetime, m/m bandwidth, s-1 magnetic field strength, Tesla speed of light in vacuum (2.998 x 108 ms- 1) maximum rate of information transfer, bits per second (bps), s- 1 time of future measurement, s effective energy contained within the detector cavity summed over the detection averaging time, J gravitational-wave flux, Wm- 2 strain, m/m (strain) detection limit, m/m Planck's reduced constant 1.055 x 10 34 Js noise, Wm 2 number of linearly arranged GW radiation elements, integer number of phase space cases to check for acquisition, integer number of frequency cases to check for acquisition, integer number of code sync possibilities to check, integer number of pairs of oppositely jerking at one-time mass elements, integer power of the generated gravitational waves, W temporal quality factor or selectivity of the signal-to-noise ratio, dimensionless range, m receiver 1 receiver 2 receiver antenna power efficiency, dimensionless radiated power efficiency, dimensionless signal strength, wm- 2 input signal strength, Wm- 2 output signal power, W distance between two jerking-mass, gravitational-wave radiation elements, m propagation or transmission-factor losses, dimensionless acquisition test time per test case, s integration or signal averaging time, s transmitter 1 transmitter 2 change in force of a jerking-mass, gravitational-wave radiation element, N momentum uncertainty, kg-ms 1 time interval, s 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 gravitational-wave frequency, s 1 frequency of sensed gravitational waves, s-1 transmitting frequency, s- 1 receiver-sensitivity frequency, s- 1 UNCLASSIFIED/ /f81il 8ffl&I-.k WliEii SUlklf
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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.