R&S FSV-K70, Руководство пользователя

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Formulae and Abbreviations
R&S
®
FSV-K70
361 Operating Manual 1176.7578.02 ─ 09
Figure 3
Measured
Frequency
Frequency
Modulator
Compensate:
Timing
Carrier offset
Compensate:
Timing
Gain
Compensate:
Ref. deviation
Reference
Frequency
Frequency
Modulator
X
Measured
I/Q
) ( n f
REF
) ( n f
MEAS
) ( n A
MEAS
Reference
I/Q
Compensate:
Carrier drift
Compensate:
Ref. deviation
Figure A-1: Reconstruction of the reference and measured I/Q waveforms for FSK modulation
Note that a reference deviation error is corrected in the reference frequency trace. This
ensures that the frequency deviation in the measured frequency trace corresponds to
that of the originally measured signal. With respect to the I/Q reconstruction, the mea-
sured magnitude is timing compensated using the timing offset estimated from the
measured instantaneous frequency. This ensures that the measured magnitude and
frequency remain synchronized in the reconstructed I/Q waveform.
A.1.2 Result Summary Evaluations
The evaluations for the result summary take place at the sample rate defined by the
"Display Points Per Symbol" parameter (see
"Display Points/Sym" on page 179). This
value can be one of the following:
●
"1": only the symbol instant contributes to the result
●
"2": two samples per symbol instant contribute to the result
●
the "Capture Oversampling" rate (see "Capture Oversampling" on page 154): all
samples contribute to the result equally
The results are determined by the evaluation range.
The sampling instants at this rate are referred to as "t" here, i.e.
t=n*T
D
where T
D
equals the duration of one sampling period at the sample rate defined by the
"Display Points Per Symbol" parameter
Formulae