ICZTICT (Informatie en Communicatietechnologie) Connectie Zorg Twente (Dutch: ICT (Information and Communication Technology) Association Care Connection Twente; Twente, Netherlands)
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The ICZT operation is ready to be carried out to compensate the range-variant range cell migration phase by correcting the scaling factor in the range direction,
Thus the ICZT operation can be carried out through one convolution and two multiplications, as shown in Figure 2.
From (27) we can see the scaling factor is equalized to be unity after ICZT operation.
The proposed EICZT approach conquered the limitation of conventional ICZT by introducing a perturbation function to deal with the range-variance of second-order range terms, which is essential in high squint cases.
As aforementioned, ICZT only takes the first order term into account, thus the phase error of ICZT algorithm [[PHI].sub.eICZT] is expressed as
Practically, the acceptable level of maximum phase error is [pi]/4, which means if the absolute value of [[PHI].sub.eICZT] ever exceeds [pi]/4, the conventional ICZT will result in significant degradation of the image quality.
In this configuration, the maximum phase error of conventional ICZT is higher above the acceptable level [pi]/4, as shown in Figure 5(b), and the phase error of EICZT remains to be approximately zero, as shown in Figure 5(a).
However, the measured IRWs processed by using conventional ICZT are broadened by a factor of 22% and 47% in range and azimuth, as shown in Figure 5(d).
The traditional ICZT can focus broadside or low squint SAR data well, but fail in high squint configurations due to the neglect of range-variance of the second order range terms.