| Popis: |
This paper presents calibration procedure for time domain and frequency domain mode of wideband autocorrelation radiometry, (TD-WiBAR) and (FD-WiBAR), enhanced with a comb filter for RFI mitigation. WiBAR is a novel microwave method for measuring the thickness of low-loss layers, such as snow and ice packs. The time domain mode is faster than the FD-WiBAR, but requires its own calibration. We investigated a WiBAR enhanced with a comb filter in the laboratory with a data collected from a simulation circuit using a Keysight Spectrum Analyzer. The data are further post-processed for the time and frequency domain calibration. The comb filter is provided to mitigate radio frequency interference (RFI). RFI increases the noise floor and results in a decreased signal to noise ratio (SNR) delay peak in the autocorrelation function of the WiBAR from which the snow depth is extracted. |
