This paper describes the sliding spotlight algorithm and the processing strategy to be applied for TerraSAR-X. The steering spotlight geometry is analysed. Analysis of scene size and resolution demonstrates the particularities of this mode. The Doppler frequencies for individual targets and for a whole sliding spotlight scene are analyzed and the result shows the applicability of azimuth subaperture processing to sliding spotlight data. A description of the Extended Chirp Scaling Algorithm for sliding spotlight is presented.

Abstmct-This paper describes a processing technique for combining stepped-frequency waveforms efficiently t o obtain higher range resolution. Essentially this method involves the reconstruction of a wider portion of the target's reflectivity spectrum by combining the individual spectra of the transmitted narrowbandwidth pulses in the frequency domain. This paper describes the signal processing steps involved, and shows simulation results which validate and illustrate the method.Keyword-Stepped-frequency processing, synthetic range profile, SRP, target reflectivity spectrum.

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A novel Frequency Domain, Stepped Frequency Processing(FD-SFP) technique to obtain high radar range resolution was developed by AJ Wilkinson in 1997. Range resolution is directly related to the measurement bandwidth of a radar system. The FD-SFP technique pieces together several sub portions of the target scene reflectivity spectrum to form a high resolution radar range return. This paper demonstrates the use of the FD-SFP algorithm on the CSIR X-Band experimental SAR system (RoofSAR). Some issues arising in practical implementation of the technique are discussed. Results of using the technique on radar data recorded by the RoofSAR are presented. It is concluded that the technique provides a viable optlon for generating SAR imagery with high range resolution and an acceptable level of ghosting artifacts.