AAWSAP DIRD, High-Frequency Gravitational Wave Communications, April 2010

Text

This text came with the file. It may have mistakes. When the text and the image disagree, the image is right.

UNCLASSIFIED//iiOlil OiiiilCI0L Llili QPIL¥
2.0 HFGW Communications
Consider the case of a single point-to-point two station full duplex communication
system, as is represented in Figure 1. Such a system is often characterized as a single
data link, and requires two transmitters, one at each end, and two receivers, one at
each end. To avoid self-interference the link in one direction often uses a frequency of
radiation different than the link in the opposite direction.
Full Duplex Communication Link
Using Gravitational Wave Generators and Sensors
Station 1
Station 2
r------------------~
r------------------~
I
GW Generator
I
I
GW Sensor
' '
I
I
' Sianal 1 + Source Noise
,~
I
'
I ~
<01
(01
Xmit 1
Rcvr 2
Additional Link Noise ---~
I
►
-----.
-----.
I
I
I
I
I
I
I
GW Sensor
I GW Generator
I
_,
Sianal 2 + Source Noise
I
~,
' 'I
'
{02
Xmit2
Rcvr 1 r-e+-------Additional_Link Noise
'
<02
'
+-­
'
'
+-­
'
'
'
'
'
'
, ' ___________________
'
•-------------------·
'
Figure 1. Communication Link Block Diagram
If one were to apply the emerging technology of gravitational wave control to such a
link, one would use GW generators for the transmitters on each end, and GW sensors
for the receivers at each end (Stephenson, 2009a). In the example shown in Figure 1,
station 1 would have a GW generator transmitting at a frequency of ro1 and a GW
sensor sensitive to a frequency of CO2, without being sensitive to a frequency of co1.
Likewise, station 2 would have a GW generator transmitting at a frequency of ffi2 and a
GW sensor sensitive to a frequency of ro1 , without being sensitive to a frequency of co2.
This is the minimum functionality required to constitute a communication link. Signal
strengths of the respective GW generators would need to be sufficient to overcome link
loss, coupling losses, and noises sources. Signal to noise considerations and link
budgets are covered in further detail in Section 3.1.
2.1 HFGW GENERATORS (TRANSMITTERS)
2.1.1 HFGW Generator Concepts
Several sources for HFGWs or means for their generation exist. The first generation
means is the same for gravitational waves (GWs) of all frequencies and is based upon
the quadrupole equation first derived by Einstein in 1918. A formulation of the
quadrupole that is easily related to the orbital motion of binary stars or black holes,
UNCLASSIFIED//FOR OiiiilCl.t.k 1!181!! Bfltf
2