RMARKER (802.15.4 HRP UWB)
is the location of the first chip after the SFD Start frame delimiter. When playing back from a recording, RMARKER is expressed relative to the beginning of the recording. When acquiring data from hardware, RMARKER is expressed relative to the trigger point.
RMARKER is useful for calculating T_reply times in a Time of Flight (TOF) measurement. To do this:
- Make a Recording that contains the frames you wish to measure.
- Configure a Magnitude Playback Trigger in the VSA software to trigger at the beginning of each frame. You will need to use Trigger Holdoff to prevent triggering in the middle of a frame.
- Set Sweep Mode to Single.
- Restart the measurement.
- Read the RMARKER value from the Syms/Errs table. Call it RMARKER1.
- Resume the measurement (click Pause/Continue) to trigger on the next frame.
- Read RMARKER as RMARKER2.
- Calculate RMARKER2-RMARKER1.
For best accuracy, make sure that both devices performing the TOF measurement are using the same pulse shape.
See Also
