© The Institution of Electronic and Radio Engineers
A modified Doppler technique is discussed, whereby a moving object is simultaneously illuminated by two intersecting laser beams which are coherent with one another. By comparing the different Doppler-shifted signals scattered, refracted, or diffracted from two overlapping light beams at the object, the velocity of high-speed missiles has been measured with good accuracy.
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http://iet.metastore.ingenta.com/content/journals/10.1049/ree.1970.0061
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