The frequency response mismatch between the channels and its effects on the sidelobe level of OTH radar
Ni Jin · Chinese Journal of Radio Science · 2001
In OTH radars, the range information is obtained by FFT. The FFT is a match filter for sinusoid signal, and the band width of the match filter will decrease with increase in integrated time . In a particular range gate , the inconsistancy of amplitude and phase between the channels is corresponding to that of a particular band. As the band of the filter decreases, the viariation of amplitude and phase inconsistancy in the band will decrease too. The inconsistancy between the channels tends to a fixed value. After calibration, the performance of the DBF will be improved. The requirement of OTH radar for the amplitude and phase consistancy between channels will be relaxed.