User Manual

89
────────────────────────────────────────────────────
4.8 FFT Analysis Function
────────────────────────────────────────────────────
4.8.9 Cross Correlation [CCR]
Function
Rab (
τ
) =
-1
(Gab)
=Gab(ω)exp(jω
τ
)dω
Horizontal
cursor
Vertical
cursor
Stored waveform (input waveform) Stored waveform (output waveform)
Cross correlation function
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 differential τ, 0: the lowest similarity, -1: the polarity
is completely opposite
Example Cross correlation function waveforms