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Radar System Engineering

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SEC. 17.8] PULSE METHOD FOR RELAYING SINE AND COSINE 705<br />

The resulting pulses are mixed with the modulator pulse and coded before<br />

being combined with the video signals preparatory to transmission.<br />

At the receiving station, the pulses are decoded and sorted. Each<br />

of the pulse pairs (basic-plus-sine and sine-plus-cosine) is fed to an automatic<br />

range-tracking circuit which develops the required voltage as<br />

indicated in Fig. 17.12. The d-c components can be removed in the way<br />

explained in connection with Fig. 17.11.<br />

I<br />

Data<br />

transmitter<br />

(<br />

To coding and<br />

mlxmg cwcults<br />

Transmlttmg<br />

station<br />

Baw pulse ..l+13sln0<br />

From<br />

receiver<br />

Decoder<br />

Sin<br />

pulse<br />

[<br />

COS pulse<br />

Range A+B C05 f?<br />

tracking<br />

cwwt<br />

Modulator pulse<br />

Mdeo<br />

s)gnals<br />

Receiving<br />

station<br />

::;{::1<br />

diagram<br />

LL-UhhJ’Lw”whd.J.w.~h~<br />

Video signals c m Video signals<br />

Espsnded ~A+Bs,nr3y A+ Bcos@~<br />

time ~le ~-~<br />

Sm Modulator Video signals<br />

pulse pulse pulse pdse<br />

Fx~. 17.12.—Ewentialsfor relaying sine and cosine by pulse-timing methods.<br />

Since this general type of synchronization equipment has seen far<br />

more service than any other to date, it will be worth while to consider<br />

it in more detail. The following section gives an extended treatment of<br />

one particular example.<br />

17.8. Pulse Method for Relaying Sine arsd Cosine.-Electronic<br />

means for determining the interval between pairs of pulses will be considered<br />

first. In Fig. 17.13 it is assumed that the basic pulse and the sine<br />

puke have been decoded and ~eparated so that each is available on a

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