Align Impulse Response to First Measurement (Channel Sounding)
specifies whether to time-align the impulse response across measurements.
The channel sounding software performs a peak search and places the impulse response's peak sample at t=0, but the actual peak location is somewhere between t=0 and an adjacent sample. Where the peak falls in relation to the actual sample locations depends on the starting time of the acquisition, which varies from measurement to measurement. To compensate for this slight shift of the impulse response, the channel sounding software can shift the impulse response slightly so that the peak is in the same location relative to t=0 as in the very first measurement (after a VSA Restart).
Align Impulse Response to First Measurement only supports subsample alignment. If the trigger jitters by more than roughly +/-1/2 of a sample, the alignment will be incorrect and it would be better to disable this setting.
Align Impulse Response to First Measurement is disabled when averaging (MeasSetup > Average) is set to RMS (Video) or RMS (Video) Exponential.
This feature assumes that the channel response is relatively stable from measurement to measurement.
Enabled (selected)
See Also
