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以往关于雷声的研究都限于观测点雷声频域范围的探讨,由于噪音和衰减因素的影响,观测点的雷声频谱有很大失真.针对在兰州地区观测的一次雷暴过程中的雷声信号,利用数字信号处理技术,由观测点处的雷声音频信号得到频率谱,并对雷声频谱进行噪音分析;然后结合声音在大气中传播的衰减理论,分析了不同大气环境对声吸收的影响,并推算出了声源附近的雷声频率谱.
In the past, the research on thunder sound was limited to the range of the thunderfield frequency at the observation point, because of the noise and attenuation factors, the thunder spectrum of the observation point was greatly distorted.Aiming at the thunderstorm signal during a thunderstorm observed in Lanzhou , Using digital signal processing technology, the frequency spectrum is obtained from the thunder audio signal at the observation point, and the noise analysis of the thunder spectrum is carried out. Then the influence of different atmospheric environments on the sound absorption is analyzed based on the attenuation theory of the sound propagation in the atmosphere , And deduced the thunder frequency spectrum near the sound source.