Research On Large-scale Infrared Interference Signal Acquisition And Transmission Technology Based On FPGA

At present,atmospheric infrared remote sensing detects atmospheric temperature and humidity information through Fourier spectrometer on satellite,which provides data source for numerical weather forecast.With the continuous improvement of the real-time requirements for hyperspectral resolution detection in numerical weather prediction,the spaceborne Fourier spectrometer needs to be equipped with a larger focal plane detector to speed up the observation frequency.The massive infrared interference signals collected by the detector increase exponentially.How to realize the high-speed acquisition of infrared interference signal in the case of large detection element scale,and stably and reliably transmit,analyze and process these massive data has become the key to the integration and development of high-speed interference signal acquisition and transmission system.Relying on the "Fengyun 4" project of Shanghai Institute of Technical Physics,Chinese Academy of Sciences,this paper investigates the current research status and development trend of Fourier spectrometer and information acquisition technology at home and abroad,and constructs an infrared interference signal acquisition system for the high-speed acquisition and data transmission rate of large-scale infrared interference signals,The purpose is to realize high-speed acquisition and stable and reliable transmission of large-scale infrared interference signals.The main work is as follows:1.The scheme design of infrared interference signal acquisition system is completed based on FPGA programmable logic.The system hardware circuit module uses the serial output high-speed adc analog-to-digital conversion chip and jesd 204 b protocol to collect the data of the interference signal.In order to meet the needs of large-capacity data storage of the infrared interference signal,four pieces of mt41j256m16ha-107 DDR3 memory are externally mounted to complete the data cache,and PCIe 2.0 protocol is used to transmit the interference signal at a high speed.The system logic module completes the development of FPGA data acquisition,control and transmission modules,mainly including the connection of each sub module interface,the configuration of detector working clock and working mode parameters,the modulation of laser pulse sampling signal generated by Michelson interferometer,high-speed acquisition of infrared interference signal and timing control of transmission module,The high-speed acquisition and stable and reliable transmission of infrared interference signal are completed.2.The test platform of infrared interference signal acquisition system is built by using focal plane detector,and the function verification and performance test of related software and hardware are carried out.It mainly includes the test of optical path difference sampling module such as detector,infrared interference signal acquisition and transmission module and infrared interference signal acquisition and verification test.The test results show that in the actual acquisition and transmission process of infrared interference signal,the acquisition frequency of infrared interference signal can reach 80 MHz and the transmission rate of infrared interference signal can reach about 2GB / s.The designed infrared interference signal acquisition system successfully obtains the interference signal of focal plane detector,effectively improves the acquisition quality and speed of infrared interference signal,and realizes the high-speed acquisition and stable and reliable transmission of large-scale infrared interference signal.Finally,the prospect of realizing larger acquisition array and faster observation frequency of Fourier spectrometer is prospected,which accumulates the technical foundation and explores the technical route for the space application of spaceborne Fourier spectrometer.