SAR (Synthetic Aperture Radar) imaging signal processing data transposing method based on FPGA (Field Programmable Gata Array)

A technology for processing data and imaging signals, which is used in the design of synthetic aperture radar imaging systems, and uses FPGA to realize the field of SAR imaging signal processing data transposition, which can solve problems such as incompatibility with on-board systems, and achieve low power consumption, stable operation, and improved performance. The effect of work efficiency

Inactive Publication Date: 2013-04-03
XIDIAN UNIV
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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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  • SAR (Synthetic Aperture Radar) imaging signal processing data transposing method based on FPGA (Field Programmable Gata Array)
  • SAR (Synthetic Aperture Radar) imaging signal processing data transposing method based on FPGA (Field Programmable Gata Array)
  • SAR (Synthetic Aperture Radar) imaging signal processing data transposing method based on FPGA (Field Programmable Gata Array)

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] The present invention transposes the SAR imaging signal processing data through FPGA, and the FPGA chip used is StratixIII EP3SL340H1152I3, or StratixII EP2S90F1020I4 model, but not limited to these two.

[0033] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0034] Step 1. The SAR imaging signal processing data is continuously transmitted to the FPGA from the front end according to the distance, and then the FPGA stores the data into the DDRII SDRAM memory to form matrix data.

[0035] Since the throughput rate of the user side and the DDRII SDRAM memory side are different, this step is mainly to call the asynchronous FIFO memory in the FPGA to cache the data, and at the same time realize the synchronization of the clocks at both ends of the FIFO.

[0036] Step 2. Carry out matrix division of the matrix data i...

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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 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/90
Inventor 王一鸣梁毅王虹现邢孟道陈皓张佳佳
Owner XIDIAN UNIV
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