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Radar System Engineering

Radar System Engineering

Radar System Engineering

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42 THE RADAR EQUATION [SEC.2.11<br />

sweeps integrated then is limited by the number of pulses striking the<br />

target during the scan and not by the screen persistence. If, however,<br />

the latter is so long that storage is effective from one scan to the next, we<br />

FIG.2.7.—Inthisseriesof photographs,thenumberof A-scopesweepsrecordedduring<br />

eachexposurewasvariedfrom 12to 400. Artificialsignalswereinjectedat tbe locations<br />

marked,withthefollowingstrength,relativeto averagenoisepower: S1,+10 db; S!, +5 db;<br />

.’%,Odb; S,, –5 db.<br />

must include more than one scan in estimating the amount of the integration,<br />

and the screen persistence again enters.<br />

Let us try to elucidate this rather complicated state of affairs by

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