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Radar System Engineering

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658<br />

When o = Othe<br />

instead<br />

MOVING-TARGET 1NDICA TION [SEC. 16.14<br />

above equation for AU no longer holds and we have<br />

AU = @z for 8 = O.<br />

For v = 300 mph and O, = ~. radian, as before, we get AU = ~ mph,<br />

showing that the fluctuations are negligible when the antenna is pointing<br />

straight ahead.<br />

When the system is carried in an airplane there is an effect due to the<br />

depression angle as well as the azimuth effect just discussed, Since the<br />

beam is usually broad in a vertical plane, the range of depression angles<br />

within the illuminated area of clutter is limited by the pulse ~vidth.<br />

Under these conditions the spread in radial velocity is given by<br />

‘L’ = m<br />

w sins d cos O<br />

Cos ~<br />

for @

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