User Manual

186
────────────────────────────────────────────────────
8.7 Analysis Function
────────────────────────────────────────────────────
8
.7.9 Cross Correlation [CCR]
Functio
n
Rab (τ) =
-1
(Gab)
= Gab (ω)exp(jωτ)dω
Horizonta
l
curso
r
Vertica
l
curso
r
Vertical axis Display
LIN-REAL (real-number part) −
LIN-IMAG (imaginary-number part) −
LIN-MAG (amplitude) Rab
LOG-MAG (logarithmic amplitude) −
PHASE (phase) −
S
tored waveform (input waveform
)
S
tored waveform (output waveform
)
C
ross correlation functio
n
Displays the degree of similarity between two points separated by a time
difference (τ) on two signals.
The degree of similarity is expressed as a function of the time difference (τ).
Major applications:
・Obtaining the phase difference between two signals in time units.
・Obtaining a speed or distance by measuring the time delay.
Time Time display. The center indicates the reference (τ=0), the right
side indicates time lag (+τ), and the left side indicates time lead
(-τ).
Linear Readings are from +1 to -1 (no units).
+1: the highest similarity between the input and output signals
for time differentialτ, 0: the lowest similarity, -1: the polarity is
completely opposite
Example Cross correlation function waveforms