The principle of SAR imaging has been briefly introduced in this chapter, and the echo signals of stationary and moving targets in a broadside airborne SAR system have been established. By comparing the Doppler parameters between the stationary and moving targets, the relationship between motion parameters of moving targets and the Doppler centroid, Doppler modulation rate and RCM has been analyzed.
Based on the analysis, three classical single-channel GMTI algorithms have been introduced in this chapter, and their limitations have been discussed. Moreover, the principle of GMTIm algorithms with Keystone transform and time-frequency analysis algorithm has been introduced, and the limitations in Doppler centroid ambiguity and motion parameter derivation have been studied.
The content in this chapter is the foundation of the following chapters. The limitations of existing algorithms mentioned in this chapter are further studied and solved in the proposed algorithms in this book.