Gw. Davidson et al., THE EFFECT OF PULSE PHASE ERRORS ON THE CHIRP SCALING SAR PROCESSING ALGORITHM, IEEE transactions on geoscience and remote sensing, 34(2), 1996, pp. 471-478
The chirp scaling (CS) SAR processing algorithm uses the linear FM pro
perty of the transmitted pulses to provide accurate range cell migrati
on correction, However, when the transmitted pulse is not linear FM, o
r if the FM rate is not known exactly, processing errors due to chirp
scaling will result, This paper presents the resulting processing erro
r in the CS algorithm, given pulse phase-errors that exceed those expe
cted in current SAR systems, The registration and phase error that res
ult in chirp scaling are negligible for typical or stable pulse phase
errors, or can be avoided if phase modulation coefficients are estimat
ed from the replica. A fast Fourier transformed pulse replica is suffi
cient to form the range matched filter in the CS algorithm, giving sli
ghtly better range resolution than the range/Doppler (R/D) algorithm.