Synthetic aperture radar (SAR), originating fin 1950s, is a form of radar imaging technology which utilizes the relative motion between an antenna and its target region to simulate an extremely large antenna or aperture electronically, and which generates finer spatial resolution than that is possible with conventional beam-scanning means. Conventional single-antenna stripmap and spotlight SAR systems are inherently limited in meeting the rising demands of future remote sensing missions. Innovative SAR imaging techniques are thus needed to be developed. The most promising of these techniques usually employ multiple antennas. Multiple antennas can be placed either in a monostatic platform which results in a monostatic multi-antenna SAR system or in distributed platforms which results in a distributed multi-antenna SAR system. The concept of multiple channels in elevation dimension proposed by Griffiths and Mancini consists of an array antenna split in elevation dimension.