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I tried to remember what it was. Colonel
Kim turned to some photos at the back of the report. "The Germans
did not have a thing called a Transmitter Receiver cell, which was invented
in Britain. The TR cell allows both the radar transmitter and receiver
to use the same antenna. The TR cell is filled with neon gas which strikes,
and the electrical conduction of the gas protects the sensitive receiver
from the powerful pulses of microwave energy coming from the transmitter.
Having a common antenna for the transmitter and receiver makes the whole
process of deciding where the aircraft is so much simpler. However, the
German Würzburg and Freya radars, without the TR cell, had to use
separate transmitter and receiver antennas, and keeping them both pointing
in exactly the same direction was much more of a problem."
Surely they are not taking my story
seriously ? I could feel myself sweating slightly.
"It is lucky that you had studied
older radar systems, because that seems to be what gave you the idea for
countermeasures against the stealth bomber," said Colonel Kim, smiling.
"The stealth bomber is made in an unusual shape to minimise the radar
signal from it, but this shape only minimises the signal reflected back
to the radar transmitter. There is still a lot of radar signal that is
reflected off the aircraft in other directions, and in particular scattered
forwards away from the radar. This is in spite of all the Radar Absorbing
Material covering the aircraft. The RAM is especially designed to reduce
this forward scattered signal, but even when the RAM is dry it probably
absorbs only about ninety percent of the signal. The remaining ten percent
is still strong enough to be useful, and that is what our system uses."
"Captain Jang has deployed many
low-cost SAM trucks all around the countryside, with their surveillance
transmitters switched off so that the enemy cannot home on to them, and
listening for aircraft forward scatter signals produced by some of our
other SAM radars. All these signals are continually sent to a central computer,
something the Germans never had of course, which can then calculate where
the aircraft is. The computer does this by comparing the different time
delays - rather like the techniques used in radio astronomy. When we know
where the aircraft is we can track it, and when we can track it we can
launch a missile against it. All our system needs is a short run by one
of our own aircraft for position calibration, and we can even use the American
satellite Global Positioning System to help us with that !"
They're mad. It was only a story. "You
have actually built this system ?" I asked incredulously.
"Well, almost. We can track a
small radio controlled aircraft, the Jindivik, which you may remember was
used for target practice many years ago. We are fairly confident that the
forward scatter signal is no more than that from the F-117, but our remaining
problem is finding at what height it is flying. This is especially important
in a hilly country like ours. Anyway, you can talk to Captain Jang about
that tomorrow."