Determination of Modulation Transfer Functions from the 'Noordwijk' Radar Measurements in 1978 and 1979

摘要

Times series of 20 min and longer, simultaneously recorded from a wave gage and an X-band FM-CW radar are analyzed. Modulation Transfer Functions (MTF) are determined as a function of polarization and incidence angle. The coherence between the wave gage signal and the radar signal is taken into account (cross spectral analysis). For comparison with previous results, the incoherent MTF is also determined (division of auto power spectra). A theoretical background for the MTF and its coherent determination is given. The measurement configuration and the preprocessing of the data are discussed.