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Radar System Engineering

Radar System Engineering

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138 C-W RADAR SYSTEMS [SEC, 5.6<br />

relatively small i-f amplifications can be used, the remaining amplification<br />

being done after the second detector.<br />

The most important consideration in doppler work is keeping the<br />

transmitter frequency modulation down. This will be discussed in<br />

Transmitter receiver unit<br />

I-Azimuth scale<br />

E. Le”e, “(a,<br />

Elevation scale’ /’//<br />

Transmitting /<br />

paraboloid //<br />

,.<br />

A<br />

ir-- Vetfical shaft and<br />

, drive motor assembly<br />

—Azimuth handwheel<br />

Elevation //<br />

handwheel<br />

Horizontal shaft’<br />

and yoke A’<br />

AA<br />

..<br />

‘4s“L<br />

1:1~.5,6.—Rear view of 10-cnldoppler system. (Courtes~ of Spem~ Gwoscope Compang,<br />

Inc.)<br />

detail in connection with another system but it should be noted here<br />

that short-time frequent y stabilities of the order of a part in 10’0 must<br />

be attained if the system is to work with full sensitivity in the presence<br />

of ground clutter. This requires careful attention to microphonics and<br />

to power-supply filtering. Also, the transmitter filament must he sup-

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