Prototype Design Of Spaceborne Image Preprocessing Based On FPGA

With the development of remote sensing technology,the current spaceborne remote sensing data has the characteristics of various types,large data volume and high complexity.In order to ensure the working efficiency of the spaceborne remote sensing target tracking and detection system,it is necessary to eliminate useless remote sensing image data in remote sensing images based on spaceborne equipment.Using the image preprocessing system to preprocess the remote sensing image is beneficial to filter out the main noise of the remote sensing image and speed up the processing speed of the tracking and detection system.This paper completes the prototype design of the spaceborne image preprocessing system based on FPGA(Field Programmable Gate Array).First,according to the source of the project,complete the demand analysis.According to the system requirements,the XC7A100 T chip with low cost,low power consumption and high stability is selected as the main control.Around the main control chip of the system,the hardware circuit design is completed,including power supply circuit,Ethernet interface circuit,optical fiber circuit and peripheral function circuit,etc.,and the construction of the system prototype hardware platform is completed.Secondly,according to the functional requirements of the project,the design is divided into image preprocessing module design,satellite communication module design,image data storage and display module design.The image preprocessing module is based on the hardware platform to realize remote sensing image preprocessing.In this paper,the median filter algorithm with fast calculation speed and the ability to filter common remote sensing image noise is selected.The satellite communication function includes two parts.The first part is to simulate the input of remote sensing images through Ethernet,and the second part is to transmit high-speed data between the SRIO(Serial Rapid IO)simulation preprocessing system and the remote sensing target tracking and recognition system.The storage function is completed by the onboard DDR3,and the processed image data sent by SRIO is written into the onboard DDR3.The design of the display module is to display the processed image through the VGA display device.Finally,the functional test of the system prototype is completed.Inject 1000 frames of remote sensing image data to be processed into the image preprocessing system prototype at an average rate of 83.5Mbps.All 1000 frames of UDP transmission are displayed on the display device,and the processed image is displayed on the display device.Export the processed data of one frame,and use software to process the same image.Compare the effect of software and system processing.Intuitive observation,the processing effect is consistent.