Analysis and comparison of ω-k and polar format algorithm for spotlight SAR

Investigates the properties of both ω-k and PFA (polar format algorithm) under the mode of spotlight SAR. Based upon classifying preprocessing of spotlight SAR echo signals as dechirp in temporal domain and matched filtering in frequency domain, the corresponding different implementations from the two algorithms are analyzed respectively and comparatively. Analysis and comparison are presented in terms of the residual video phase, impacts resulting from the approximation of the algorithms associated with, as well as interpolation. Dechirp can reduce the computation load substantially, yet RVP is unavoidable, RVP does not exist inherently in the case of matched filtering.