声光可调谐滤波器成像光谱仪实时预处理系统

Real-time pre-processing system of AOTF imaging spectrometer

为了快速实时地预处理声光可调谐滤波器(AOTF)成像光谱仪的数据,分析了AOTF成像光谱仪数据特点及预处理算法,采用数字信号处理器(DSP)作为核心器件代替传统的PC机处理平台,提出了一种基于两片ADSP-TS201的外部总线共享与链路口混合耦合的双DSP并行处理系统方案。结合实际需求,设计了流水线处理方式并合理分配预处理任务。用实验方法对系统的功能进行了验证,结果表明:双DSP并行处理系统完成一帧AOTF成像光谱仪数据的预处理仅需23.5 ms,比原有PC机处理速度提高了13倍左右,满足了实时性要求,促进了AOTF成像光谱仪系统化、模块化、小型化并兼具实时处理能力的发展。

In order to realize the rapid and real-time data pre-processing of an imaging spectrometer based on Acousto-optic Tunable Filter（AOTF）,the data characteristics and a pre-processing algorithm of the imaging spectrometer based on AOTF were analyzed.Then,a scheme of dual Digital Signal Processor（DSP） parallel processing system based on two chips of ADSP-TS201 coupled the external bus sharing and the link ports was proposed by using DSP instead of the traditional computer processing platform as the key device.Proceeding from practical requests,a pipeline processing was designed,pre-processing tasks were allocated rationally,and the functional verification was implemented.The practical application shows that it takes 23.5 ms to accomplish the pre-processing task for one frame data of imaging spectrometer based on AOTF,which increases 13 times than that of PC and meets the real-time requirement.The system proposed in this paper promotes the development of systematism,modularization,miniaturization and the capability of real-time processing of the imaging spectrometer based on the AOTF.