利用光栅探测激光信息的迭代算法研究

摘要

Based on the rebuilding of grating Fraunhofer diffraction,four kinds of iteration algorithms are proposed to overcome the effect of mechanical structural variation.By comparing four kinds of iteration algorithms,the algorithm that fleetly approaches theoretical expectation can be obtained.Smaller value of wavelength and incident angle is se-lected,and then wavelength approach is slowed down and incident angle approach is speed up.Numerical calculation shows that the more times iteration algorithm is required for the bigger incident angle based on the small-angle approx-imation.At last,the data processing on the DSP chip is given.%在重新构建了光栅的夫琅和费衍射系统的基础上，提出了四种迭代逼近的算法以克服了机械构建变化的影响。通过对四种不同迭代逼近算法的比较，找到了能够最快速逼近理想解的算法，即波长和入射角都采用较小值，波长逼近相对变慢，入射角的逼近变快，总体能够快速达到逼近要求。计算过程也表明，建立在小角度近似的基础上迭代逼近算法对于大角度需要进行的迭代逼近次数更多。最后给出了便于在DSP芯片上使用程序快速处理的数据处理流程。