Highly efficient design of SDRAM-based CTM for real-time SAR imaging system

The amount of radar's raw echo data is usually very large. At the same time, synthetic aperture radar (SAR) imaging system needs rapid transpose efficiency to improve the real-time performance of the system. Therefore, modern real-time SAR system requires high-speed and large-capacity devices which are usually SDRAM chips to store raw echo data and to solve the corner turning problem by efficient matrix transpose method. By designing data interleaved patterns and controlling command cycles of SDRAM chips in a reasonable way, this paper presents a novel matrix transpose method which can be used to improve the efficiency of corner turning memory (CTM) for real-time SAR imaging system. After board-level verification, the efficiency of this new matrix transpose method can be greatly improved to >99%, which is greater than other typical SDRAM-based CTM design methods and is more suitable for real-time SAR imaging system.