Data Filters

Most data displays offer a filter function sub-menu accessed by clicking Filter. The filter can be turned on/off by checking/unchecking Enable Filter. 

Three filter flags can be selected:

Interpolate Rain Samples: This filter linearly interpolates the data samples taken during rain events by using the two ‘no rain’ samples before and after the rain event. E.g. the water vapour line channels are very sensitive to droplets on the microwave radome or shutter blocking. The acquired data will not be useful in this situation and can be overwritten by this filter.
Spike Clipping: This filter eliminates sharp spikes in the data caused by blocking the microwave window during the measurement (e.g. by human beings, birds etc.). The maximum spike length measured in samples can be defined in Maximum Spike Length [Samples] and a clipping threshold is entered in Clipping Difference Threshold to distinguish the spike from general noise. 
Enable Averaging: Noise on the data may be reduced by this filter. It generates the mean value of the number of samples given in Integration Samples for Averaging Filter. These samples are centered around the filter sample.

When pressing Apply the filter with its new settings is executed. The resulting filtered data file can be stored with the Save Filtered File command.