Documents / Official release
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.
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"labeled" as whatever is recovered from the receivers at the same frequency as (and
indeed phase-locked to) the modulation, so therefore the PPF can be distinguished from
scattered BPF very easily. Typically a lock-in amplifier (referenced to the field
modulation) is used to recover the signal in such an arrangement, which provides
significant noise rejection by effectively reducing the detection bandwidth.
D01.3 Microwave Transmitter {Gaussian beam>
Design of the microwave transmitter for the Gaussian beam, directed towards the
central fractal membranes: Dr. R.C. Woods (LSU) + graduate student, Dr. R. M L
Baker (TSC), G.V. Stephenson (TSC). This is expected to require 10 to possibly
10,000W (1,000W nominal) at around 10GHz, with an associated power supply and
appropriate safety interlocks. Possible technologies include solid-state, magnetron,
traveling-wave tube (TWT), or high-power klystron, and specifications will be developed
under this component of the work. These are all mature technologies and commercial
units will suffice. Possible suppliers include: Microwave Power Inc. (Santa Clara,
California; solid-state, up to S00W); ETM Electromatic Inc. (Newark, California; TWT or
klystron, up to 10kW); and Toshiba Electron Tube and Devices Co., Ltd. (Japan; TWT or
klystron, over 10kW). Generally speaking, wideband solid-state amplifiers produce less
output power than medium bandwidth models or narrow-band tube designs, so that the
compromise here will be to decide whether to accept lower power in favor of wide
tunability. Also required is a suitably matched transmit antenna. Aga in, commercial
designs will suffice, such as those from Rozendal Associates Inc. (Santee, California),
ETS-Lindgren (Cedar Park, Texas), or Orban Microwave Products (El Paso, Texas). The
compromise that must be worked out in the antenna design is that a high-gain antenna
is needed to constrain the GB to be within the resonance cavity or interaction volume
(so that microwave input power is not wasted), but a high-gain antenna is less tunable
than a broadband low-gain antenna. As in other work areas of this proposal, the
complete design will need to establish the cost-performance tradeoff issues surrounding
the various approaches.
DD1.4 Fractal Membranes and Microwave Absorbers
Design of the fractal membranes as microwave reflectors/absorbers at select
frequencies (Wen et al., 2002; Zhou et al., 2003) and other high-performance
microwave absorbers: Dr. R. M L Baker (TSC), G.V. Stephenson (TSC).
DDl.4.1 Design of the fractal membrane (FM) reflectors at the waist of the
Gaussian beam including their paraboloidal form. An analysis will be completed to
determine the optimal material of the FMs (copper, stainless steel, or aluminum are the
obvious leading candidates). A paraboloidal surface will be designed that can be
fabricated from the FM to focus the PPF at the planned locations of the microwave
receivers. Hong Kong University of Science and Technology can fabricate the fracta l
membranes out of these metals in almost any form.
DDl.4.2 The interior of the containment vessel (except for an opening at the
Gaussian-beam transmitter end) must be treated to eliminate exterior sources of noise.
Either a Faraday Cage (using a mosaic of HTSC tiles; for example, YBCO) or fractal
membranes are possibilities. Both will be examined in detail to determine the optimal
approach. A design compatible with the containment vessel shape (DDl.1.4) and
placement of interior detector elements will be developed.
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47 Not linked to a story yet.
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.