Department of the Air Force Committee to Review Project Bluebook, 1966-1967

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It was ag1.--eed by the Pa11el that no government-sponsored program
of optical nation-wido sky patrol is worthwhile at the present time,
and that the encouragement of amateur astronomers to undertake such
a program 111:i,eht have• the adverse offeot of over--omphasizi.ne; "fiyini
saucer" stories in the public mind ..
However, the issue of radar scope
cameras for recording peculiar radar echoes would serve several pur­
poses, including the better understanding of radar interference as
well as identification of U.F.O.•s.
RA.DAR PROBLFM, OF' MUTUAL INTERFERENCE
This characteristic problem of radar operation wherein the pulse
signal (of approximately the same frequency) from station A may be
picked up on the screen of station B and show as a high-spe.ed track •
or series of dots was recognized.to have probably caused a number of
U.F.o. reports. This problem was underli.n0d by ir1forma.tion ·received
indicating ADC concern in solving this problem of signal identification . ••
before service use of very high-speed aircrart·or guided missiles
(1955-1956).
Dr. Berkner believed that one answer to this problem
was the use of a "doppler filter" in th~ receiving circuit. Dr.---·
suggested that the problem might be better solved by the use of a
"controlled jitter" wherein the operator receiving "very fast tracks"
(on the order of 1000- 10,000 m.p.h.) would operate a circuit which
woul.d alter slightly his station's pulse frequency rate. If the signal
received on the screen had been caused by mutual interference with
another station, the track would now show itself at a different distance
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