Research On Data Processing Algorithm Reconfiguration System Of On-Board Hyperspectral Interferometry

Infrared hyperspectral atmospheric detector has the advantages of high spectral resolution,high throughput,multi-channels and broad spectral coverage.It is widely used in meteorological,environmental analysis,or atmospheric composition detection.It is an important load on the meteorological satellite.With the development of technology,the performance of infrared hyperspectral atmospheric detector has been improving in data accuracy,detection range and other aspects.But along them there appeared some questions,one of which is that the amount of data obtained is getting bigger and larger,and the downfall of the data on-board brings pressure to the data transfer system.Reducing the amount of satellite downlink data rate has become an important direction of meteorological satellite research.Based on this situation,a data processing algorithm reconfiguration system of on-board hyperspectral interferometry is designed to processing the interferometric data on the satellite,thus reducing the amount of data transmitted down.Due to the fact that the research of on-board data processing algorithm is immature,the system has reconfigurable function,which provides technical support for subsequent algorithm updating.In this paper,the hyperspectral interference data is processed by using the radix-4 FFT algorithm based on Xilinx FPGA to obtain the spectrogram,intercept the spectral data of corresponding bands to reduce the down data rate.According to the hardware resource characteristics of Xilinx FPGA,a high-speed radix-4 FFT algorithm structure is designed by making full use of XtremeDSP and Block RAM hard core in the chip.FPGA reconfiguration system is designed based on the anti-fuse FPGA of ACTEL and EEPROM.The data is upload through the satellite-to-ground link chain and stored in EEPROM after verification.Then ACTEL FPGA is used to reconfigure timing control and function simulation,and reconfigure the FPGA that needs algorithm modification.The research results show that,this design of data processing algorithm reconfiguration system of on-board hyperspectral interferometry is feasible.The interferometric data is processed by Fast Fourier Transform,and the amount of downloaded data is reduced.At the same time,the reconfiguration system also realizes the algorithm update for on-board FPGA.The results of this research are of great reference value for the further research of hyperspectral interferometry data processing and the realization of on-board FPGA reconfiguration.