Actual measurement example of ETC/ITS spot using the signal analyzer
The burst signal of ETC/ITS spot is certainly capt ured using real time mode and trigger function.
Since the interval of burst signal of ETC / ITS spot is very short, a spectrum analyzer by sweep system can not measure the signal well.
If the real time mode of signal analyzer MSA500 series is used, any spectrum will not be misse.
| Spectrum measurement
[ Power trigger & MaxHold functions ]
*2 channel signals of ETC roadside unit (579 5 & 5805MHz)
| Spectrogram analysis
[ Spectrogram ]
X axis is time(frame),Y axis is frequency and Z axis i s power (displayed by color).
By display by three dimensions, the time response of signa l can be analyze
*5795MHz of ETC roadside unit (ASK sign al)
|Time domain analysis ※ SPAN：20ＭＨz@all images|
|①[ "Power vs time" & "Spectrogram" of ASK signal ]
*The time response of the transmission signal of the ETC roadside unit generated in burst and modulated by ASK is o bserved.
|②[ "Power vs time" & "Spectrogram" of QPSK signal ]
*The average transmission power can be determined from ”power vs time” analysis of QPSK signal at ITS spot.
|③ ["Phase vs time" & "Spectrogram" of QPSK signal ]
*The time response of the transmission signal of the ITS spot generated in burst and modulated by QPSK is observed.
|Handheld signal analyzer[MSA558]||x 1|
*MICRONIX Corporation reserves the right to make changes in design, specification and other information without prior notice.