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ETTC'2003 - SEE

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The IOT Facilities shall provide uplink and downlink chain calibration<br />

processing. It shall characterize RF station paths and eliminate the IOT facilities<br />

contribution to IOT measurement.<br />

Sequence of the measurement:<br />

The first step : configuration of the test bench equipments and RF pathway<br />

(ASA, PM, Uplink chain and downlink chain of RF station...)<br />

The algorithm is:<br />

N1 :<br />

The reference measurement is done at channel center frequency CCF,<br />

Select ASA function : marker peak, marker delta<br />

N2 :<br />

A measurement is done, at (CCF – (Channel bandwidth/2))<br />

Selected ASA, function peak level, delta frequency and delta level<br />

N3:<br />

A measurement is done at center frequency in order to eliminate all drifts of<br />

measurement conditions,<br />

ASA function: peak level, delta frequency and delta level<br />

N4 :<br />

A measurement is done, at (CCF – (Channel bandwidth /2) + Frequency step)<br />

Selected ASA, function peak level, delta frequency and delta level<br />

For i = 5 to i = (channel bandwidth / frequency step)*2<br />

If i is odd<br />

Ni :<br />

A measurement is done at CCF in order to eliminate all drifts of measurement<br />

conditions,<br />

ASA function: peak level, delta frequency and delta level<br />

If i is even<br />

Ni :<br />

A measurement is done, at (CCF +/- (Channel bandwidth/ 2) + i frequency step)<br />

Select ASA function: peak level, delta frequency and delta level<br />

In order to eliminate station contribution, the result data of Station Gain versus<br />

Frequency is taken away from the complete result file. Then, only the satellite<br />

gain versus frequency is displayed.<br />

-6-

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