FM Filter Bandwidth
Menu Path:
FM Frequency Modulation Filter Bandwidth specifies the 3 dB bandwidth for the low-pass differentiating filter applied to both the Measured FM and Measured FM Slope demodulation trace results. In this way, you can filter out unwanted signals and control the amount of noise included within the reported FM and FM Slope demodulation traces.
Depending on the FMCW signal modulation pattern, signal noise levels, and acquisition Span, it may be necessary to manually adjust the FM Filter Bandwidth (Hz) in order to achieve stable FM Slope trace detected regions when using either Automatic or Sync to Manual Reference Region Synchronization modes.
- Automatic (default selection)
- By default, FMCW analysis automatically determines an appropriate FM Filter Bandwidth (Hz) value based on the specified Time Length (s) and current measurement Span (Hz). Information on automatically determined FM filter bandwidth and time aperture are reported separately as Bandwidth (Hz) and Aperture (s) values below the FM Filter Bandwidth settings..
- Bandwidth Relative to Span
- Alternatively, you can manually specify an appropriate Bandwidth Factor (%) value (in valid range 0.05% to 50%) which is used to calculate FM Filter Bandwidth (Hz) value as a percentage of current measurement Span (Hz). Information on manually determined FM filter bandwidth and time aperture are reported separately as Bandwidth (Hz) and Aperture (s) values below the FM Filter Bandwidth settings.
- Default value (Manual BW Factor): 1.25 %
