Matrix transposing method of SAR (synthetic aperture radar) imaging system and transposing device

Abstract

The invention belongs to a matrix transposing method of an SAR (synthetic aperture radar) imaging system and a transposing device. The method comprises the following steps: inputting SAR echo matrix data, dividing an echo data matrix and generating read and write addresses, writing the echo matrix data into an SDRAM (synchronous dynamic random access memory), and reading the echo matrix data into an output buffer unit to finish transposition output of the echo matrix data. The transposing device comprises an FPGA (field programmable gate array) transposition processor, a single SDRAM and an imaging processor, wherein the FPGA transposition processor comprises a communication unit, a parameter configuration unit, an address write unit, an address read unit, an input buffer unit, an SDRAM control unit, the output buffer unit and a serial conversion unit. According to the invention, during transposition process, the size of a matrix block can be configured to carry out optimal division according to the size of an input echo original data matrix; therefore, the invention has the characteristics that the transposing device has a simple and reliable structure, the SDRAM line feeding times is minimum and the transposition efficiency is high in a whole read and write procedure, the applicability in the size of the data matrix to be transposed is strong, and the like.

Description

Technical field [0001] The invention belongs to the field of synthetic aperture radar (Synthetic Aperture Radar—SAR), in particular to a matrix transposition method of a synthetic aperture radar imaging system and a matrix transposition process using FPGA (Field Programmable Gate Array) as a processor in the method Device. Background technique [0002] SAR was developed in the 1950s, and it is an important milestone in the development of radar. Compared with optical sensors, SAR has all-weather, all-weather, long-distance and wide observation bands, and the ability to easily distinguish moving targets from a fixed background. At the same time, because of its high resolution, synthetic aperture radar has received extensive attention. The SAR imaging process is realized by dividing it into two one-dimensional processes. Therefore, it is necessary to transpose the dimensions of the data in the data processing process. With the continuous improvement of SAR imaging accuracy requir...

AI Technical Summary

Problems solved by technology

The premise of this method to achieve optimal transposition efficiency is that the data matrix can be divided into several small block matrices with a fixed size of 64×64. will greatly reduce

Therefore, this method has defects such as poor adaptability to the size of the transposed data matrix, and poor efficiency of matrix transposition when the size of the input matrix is ​​different.

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