CO_2探测仪信息处理系统的设计与实现

Design and implementation on information processing system of CO_2 sounder

鉴于CO2气体对气候的重大影响,世界各国针对CO2气体提出了多种遥感观测方法,并发射了多颗光学遥感探测仪器。CO2探测仪是基于大气分子吸收池原理,通过测量CO2和O2的吸收光谱来对大气中的CO2和O2进行观测,提供精细光谱测量结果,而信息处理系统是CO2探测仪获取高光谱分辨率和高信噪比光谱信息的关键部分。详细阐述了信息处理系统的硬件电路结构和软件系统结构,以可编程逻辑器件FPGA为核心进行信息处理系统的设计,完成了对信号的放大、相关双采样、量化、采集和传输等重要功能控制。实验结果表明,信息处理系统输出信噪比达到63.6dB,图像清晰,工作稳定可靠,实时传输数据稳定,完全满足预期设计,为最终获取大气光谱信息奠定了坚实的基础。

Given the significant impact of CO2 on climate, a variety of remote sensing method about CO2 gas is proposed around the world, and fired a number of pieces of optical remote sensing instruments. The CO2 sounder is based on the principle of atmospheric molecular absorption cell by measuring the absorption spectra of CO2 and 02 to observe CO2 and 02 among the atmosphere, which provides fine spectral measurements, the information processing system is a key part of the CO2 sounder to obtain high spectral resolution and high signal to noise ratio spectral information. This paper describes the hardware and software structure of a circuit configuration of the information processing system, FPGA is designed as the core of the information processing system to complete a signal amplification, correlated double sampling, quantizing, capturing,transferring and other important functions. Experimental results show that the output SNR of the information processing system has reached up 63.6 dB, the image is clear, stable and reliable, real-time transmission of data stability, designed to fully meet the expectations and laid a solid foundation for the ultimate atmosphere to obtain spectral information.