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Terahertz video SAR real-time processing system

A technology of real-time processing and ARM processor, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of insufficient processing speed of terahertz SAR echo signal, and achieve enhanced scalability performance, reduce development costs, and improve system resources

Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to address the problem and provide a terahertz video SAR real-time processing system that is independent of the radar transceiver and has mass production, miniaturization, low cost, strong scalability and high real-time performance, so as to solve the problem of Insufficient processing speed of terahertz SAR echo signal, and provide interfaces for subsequent transplantation of other imaging algorithms, and provide technical support for the improvement of terahertz video SAR system

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[0030] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0031] The terahertz video SAR real-time processing system of the present invention is aimed at the imaging processing of SAR echo data. The functions of the system are perfect and the imaging delay is low. Its main structure is as follows: figure 1 As shown, the digital radar receiver buffers the SAR echo data and inertial navigation information into the pre-planned corresponding DDR buffer area through the network receiving module, and sends the original echo data into the interpolation after the buffering of a frame of image data The matrix mapping module completes the beam domain correction process in the PFA algorithm, and then reads the corrected data to the FPGA through the DMA to complete the big and small endian conversion of the data and the Fourier transform of the distance upward, and then writes it back to the DDR through the DMA. The ARM side rea...

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Abstract

The invention belongs to the technical field of signal acquisition and processing, and particularly relates to a terahertz video SAR real-time processing system. The system provided by the invention is composed of an ARM and an FPGA, the ARM and the FPGA are in communication connection through an AXI bus, and the ARM performs data interaction with an SAR receiver through an lwip protocol. Data processing performed by the ARM comprises the following steps: performing interpolation matrix mapping on a received SAR image, performing transposition and amplitude normalization on the received data sent by an FPGA data processing module, and performing transposition and two-dimensional FFTshift. An FPGA quantity processing module processes the data, wherein the data is subjected to range direction FFT, azimuth direction FFT, complex signal modulo, pseudo-color conversion and video stream conversion. The terahertz video SAR real-time processing system is realized by using a high-integration FPGA + ARM platform, three functions of data receiving, data processing and data display are completed, and the size and power consumption of the system can be reduced while the development cost of the system can be decreased.

Description

technical field [0001] The invention belongs to the technical field of signal acquisition and processing, and in particular relates to a terahertz video SAR real-time processing system. Background technique [0002] With the continuous improvement of terahertz SAR technology, due to its small accumulation time, it can keep the signal acquisition time at a low level. Because of this, if the data processing capability of the imaging system can be further improved, Guaranteeing a timely refresh capability of received data, terahertz SAR can become a new type of human eyeball, accomplishing some unexpected functions. However, since terahertz SAR technology has just started, most SAR imaging systems at home and abroad are based on low-frequency band systems with large data volume and high data delay. The system structure is mainly designed to improve the parallelism of imaging algorithms, not around Considering the word "real-time", some systems integrate the imaging system with...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/904G01S7/418
Inventor 皮亦鸣杨晓波郑云伟李晋闵锐曹宗杰崔宗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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