Page 32 - 《应用声学》2021年第5期
P. 32

第 40 卷 第 5 期                                                                       Vol. 40, No. 5
             2021 年 9 月                          Journal of Applied Acoustics                 September, 2021

             ⋄ 研究报告 ⋄



                                    火箭发射的次声信号分析                                     ∗





                         戴翊靖      1,2  滕鹏晓     1†   吕 君     1  姬培锋      1   杨 军    1   程 巍     1,2



                                      (1  中国科学院声学研究所噪声与振动重点实验室            北京   100190)
                                                (2  中国科学院大学     北京   100049)
                摘要：在距离发射点 20 km 和 230 km 的两个阵列上，记录了我国一次火箭发射产生的次声波。从信号中识别
                出点火与声爆事件，观察到火箭在飞行中产生持续的次声波，以及声爆前后明显能量特征上的变化，观测到完
                整的火箭发射和飞行过程中系列次声波。为了验证采集信号中包含声爆事件，使用 Fisher 检测估计方位角和
                视速度，计算结果与火箭飞行轨迹一致，并且声爆信号的预计到达时间和估计方位与实际的时间和方位角相
                符合。结合火箭速度变化的特征，给出了声爆前低频能量较弱现象的解释和火箭超声速后次声能量特征的变
                化，揭示了火箭产生次声波的机理，为火箭发射等目标的监测提供有益的借鉴和参考。
                关键词：次声；火箭发射；声爆；Fisher 检测
                中图法分类号: P427.4          文献标识码: A          文章编号: 1000-310X(2021)05-0676-08
                DOI: 10.11684/j.issn.1000-310X.2021.05.004





                             Analysis of the infrasound signals from rocket launch


                   DAI Yijing 1,2  TENG Pengxiao 1  LYU Jun 1  JI Peifeng 1  YANG Jun 1  CHENG Wei  1,2


             (1 Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
                                   (2 University of Chinese Academy of Sciences, Beijing 100049, China)

                 Abstract: The infrasound generated by a domestic rocket launch was recorded at two receiving arrays 20 km
                 and 230 km apart respectively. Ignition and sonic boom events are identified from the signal. The continuous
                 infrasound generated by rocket in flight and the obvious energy characteristics changed before and after the
                 acoustic explosion are observed. A complete series of infrasound waves during rocket launching and flight are
                 observed. In order to verify that the observed signals contain sonic boom, Fisher detection is used to estimate
                 the azimuth and apparent velocity. The results are in good agreement with the trajectory of the rocket. The
                 estimated time and azimuth of the sonic boom signals match those observed. Combining the characteristics
                 of rocket velocity changes, the explanation of the low-frequency energy weak phenomenon before sonic boom
                 and the change of infrasound energy characteristics after rocket supersonic speed are given. The mechanism of
                 infrasound generation by rocket is revealed, which provides useful reference for the monitoring of rockets and
                 other targets.
                 Keywords: Infrasound; Rocket launch; Sonic boom; Fisher detection


             2020-11-03 收稿; 2021-04-07 定稿
             国家自然科学基金项目 (11774372, 11874389)
             ∗
             作者简介: 戴翊靖 (1995– ), 男, 浙江永嘉人, 硕士研究生, 研究方向: 信号与信息处理。
             † 通信作者 E-mail: px.teng@mail.ioa.ac.cn
   27   28   29   30   31   32   33   34   35   36   37