Design And Implementation Of Image Compression System For Deep Space Detection

With the development of China's space industry,human exploration of the universe is farther and farther,and the requirements of the deep space detection image compression system resource consumption and reliability are getting higher and higher.Beside Radiation in deep space can easily lead to single-particle effect of FPGA-based devices,which eventually leading to the whole system paralyzed.Focusing on the hardware resources and the system reliability problem,this paper ensures that the system has better image compression performance under the condition of use less resources and guarantees the reliability of the system by optimizing the hardware implementation of the algorithm and increasing the fault tolerance.Based on the high demand of image compression coding quality of Mars detector,this paper chooses JPEG2000 algorithm with discrete wavelet transform,then designed and implemented a deep space compression system on the FPGA platform with XQR2V3000,and designed the corresponding ground test verification system for the image compression system.At the same time,we have studied the resource optimization and anti-radiation fault-tolerant design of image encoder wavelet transform unit in detail.This paper mainly from two aspects,improve fault tolerance and reduce resources to design the system:1?XQR2V3000 has only 3 million gate logic equivalent gate resources,in which to achieve higher complexity JPEG2000 algorithm,must to do a greater optimization to improve the design on the JPEG2000 hardware implementation structure.Discrete wavelet transform as an important component of JPEG2000,is responsible for the completion of the image data four 9/7.For 9/7 wavelet transform,each level of transformation needs to complete the four-step row lift and four-step column lift,the core of the logical unit is the lift structure.In this system,the processing speed is not high,not onlyoptimized the promotion unit,but alsochange the four-level upgrade from parallel to serial implementation,as much as possible to reduce the logical resource overhead.2?The reliability design is to make the basic treatment for the camera input of the original data to ensure that the data into the compressed core is standard image format.It also make different fault-tolerant processing when the image data is error,missing,long and so on.In the deep space environment,the detector will be impact and radiated by a variety of heavy ion,causing a single particle effect which lead to the detection image compression system failure.By analyzing the advantages and disadvantages of the traditional three-mode redundant design,this paper gives the principle and advantages of the optimized three-mode design,and the design and implementation are applied to the image compression system to improve the anti-radiation fault-tolerant performance.In order to complete the functional verification and anti-radiation fault tolerance evaluation of the image compression system,this paper designed a ground detection and verification platform based on the on-chip system(SOC).Its main functions include analog camera output image data,transmission to the compression system processing and acquisition of compressed stream and so on.The verification platform will test the system in both normal and abnormal modes,respectively.In normal mode,the image data conforms to the protocol requirements and tests the basic functions of the system.In the abnormal mode,include the image data faulty,parameter error,length error and so on,tests the fault tolerance of the test system.