Research On Onboard Processing Technology Of Long Linear IRFPA

High resolution,high integration and wide swath are the contemporary trends of onboard infrared imaging system.The adoption of long linear IRFPA has been the mainstream in the field of push broom scanning imaging,with the development of the space remote sensing technology.Because of the new feature of the large linear array,the scale and the complexity of onboard processing system have been significantly intensified,which make up the challenge that the long linear IRFPA processing technology is faced with.This subject aims to design a highly integrated infrared data processing system compatible with a long linear IRFPA.This paper,at first,describes the background of the research and the domestic and foreign research status of the imaging system,the characteristics of onboard processing system are also enumerated.Secondly,the system solution of long linear IRFPA processing and the key technology are introduced,and the hardware and software design are accomplished following the technical route.Then a verification platform is established to verify the system performance.Finally,the system's expandability to meet the future trend of IRFPA is described.Based on the analysis of the characteristics of a 30,000 element-level IRFPA,the system is designed with the functions of data acquisition,data processing(including data rearrangement,non-uniformity correction,etc),and high-speed data downstream interface,etc.The main parameters are presented,such as data throughput,capability and precision of data processing.In addition,an analysis of design feasibility is carried out.The design employs an FPGA as the main processor,and a high-speed data bus featured in channel encoding and serialization as the downstream interface.Effort is made to solve the issues of clock distribution,design of interfaces and structure of system logic.The non-uniformity correction flow consisting of onboard radiometric calibration and real time parameter upload is planned,and the responding design of data interface and processing module is implemented.As the verification result,it is shown that the ability of data throughout and data processing can satisfy the requirements of the IRFPA imaging system.And the feasibility of the onboard non-uniformity correction design is proved as well.