Data transposition method of sar imaging signal processing based on fpga

Abstract

The invention discloses an SAR (Synthetic Aperture Radar) imaging signal processing data transposing method based on an FPGA (Field Programmable Gata Array), which is mainly used for solving the problems of high power consumption, low speed, low efficiency and no radiation resistance existing in a real-time imaging processing CTM (Communication Terminal Module) based on a DSP (Digital Signal Processor). The method comprises the following implementation steps of: storing signal processing data in a DDRII SDRAM (Double Data Rate II Synchronous Dynamic Random Access Memory) through the FPGA; performing matrix partitioning on matrix data in the DDRII SDRAM; transposing a diagonal mode matrix block and a symmetrical non-diagonal mode matrix block in sequence; when the quantity of distance direction sampling points is unequal to that of azimuth direction sampling points, transposing the an asymmetrical non-diagonal mode matrix block; resetting after transposition; and reading out the transposed data in the DDRII SDRAM as required by using the FPGA. Due to the adoption of the transposing method, the working efficiency of the DDRII SDRAM is improved greatly, and a transposition memory CTMsystem runs more stably, has lower power consumption, higher speed and higher efficiency and is resistant to radiation; and the transposing method can be applied to the design of an SAR imaging system.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing and relates to a DDRII SDRAM transposition memory, in particular to a method for realizing SAR imaging signal processing data transposition by using FPGA, which can be applied to the design of synthetic aperture radar imaging system. Background technique [0002] As an active microwave sensor, synthetic aperture radar (SAR) can realize all-day and all-weather earth observation without being limited by light and climate conditions, obtain high-resolution ground scene information, and obtain subsurface information through the surface and vegetation , and can detect hidden targets. These characteristics make it have unique advantages in military fields such as battlefield terrain detection and early warning, and civilian fields such as resource inspection, environmental monitoring, and hydrological observation. SAR imaging signal processing is characterized by complex calculations ...

AI Technical Summary

Problems solved by technology

Since DSP does not have aerospace-grade anti-irradiation products at present, the scheme using DSP as the core of imaging processing does not meet the requirements of on-board systems, and real-time imaging processing CTM onboard must be implemented with a new scheme.

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