RMARKER (802.15.4 HRP UWB)
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.
is the location of the first chip after theRMARKER 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