Abstract
Abstract Frequency hopping [also recently called range imaging (RIM) or frequency domain interferometric imaging (FII)] is a pulse compression technique used to improve the range resolution Δr of Doppler radars limited by their minimum transmitted pulse length. This technique can be seen as an extension of the dual-frequency domain interferometry (FDI) technique, since it consists of transmitting more than two adjacent frequencies. Similarly to antenna array processing used for angular scanning, RIM/FII enables range scanning along the vertical line of sight to obtain a range profile (classically called “brightness” in the literature of the field of antenna array processing). The performances of RIM/FII can be improved by using high-resolution methods such as the maximum likelihood method (or the Capon method), the singular value decomposition method with the multiple signal classification (MUSIC) algorithm, and the newly introduced improved maximum likelihood method (the Lagunas–Gasull method). The appli...
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