基于自适应带通滤波的航天器正弦扫频试验数据处理方法  

Data processing method in sine swept test for spacecraft based on adaptive band-pass filter

作　　者：尹钊[1] 侯向阳[1] 郭军辉[1] 高海洋[2] YIN Zhao;HOU Xiangyang;GUO Junhui;GAO Haiyang(Institute of Manned Space System Engineering, China Academy of Space Technology;Beijing Institute of Spacecraft Environment Engineering: Beijing 100094, China)

机构地区：[1]中国空间技术研究院载人航天总体部 [2]北京卫星环境工程研究所,北京100094

出　　处：《航天器环境工程》2017年第2期214-221,共8页Spacecraft Environment Engineering

基　　金：基金项目:国家重大科技专项工程

摘　　要：为解决传统STFT(Short Time Fourier Transform)方法因非同步采样引起频谱泄漏,造成频域曲线幅值降低,产生较大误差的问题,提出一种基于频域带通滤波的数据处理方法,通过在频域逐次移动带通滤波器的中心频率,获得信号中各个频率分量幅值的最大值。利用该方法对某载人航天器搭载的力学参数测量系统在整器正弦振动试验中采集的数据进行频谱分析,结果表明,该方法可有效获取力学参数测量系统各测点的频率幅值曲线,减少传统STFT方法产生的能量泄漏的影响。研究成果也可用于不依赖振动控制仪或无COLA通道的数据采集系统正弦振动试验的数据处理。The signal processing commonly relies on the vibration controller or the COLA(constant outputlevel adaptor)data acquisition system in the sine vibration test for the manned spacecraft.For the mechanicalparameter measurement system without the COLA function for the manned spacecraft,the traditionalSTFT(short time Fourier transform)method can result in a spectrum leakage due to the asynchronous sampling,thus the amplitude of frequency domain might be reduced and a major error might be produced.To solve theabove problem,a data processing method based on the band pass filter in the frequency domain is proposed.Themaximal values of the frequency components of the signal can be acquired by moving the center frequency ofthe band pass filter,and the spectrum analysis of the mechanical parameter measurement system in the sinevibration test for the manned spacecraft is acquired by the proposed method.It is shown that the proposedmethod can effectively acquire the spectrum at each measuring point of the mechanical parameter measurementsystem and the influence of the spectrum leakage by the traditional STFT method can be reduced.The researchfindings provide a reference for the signal processing method of the sine vibration test for the data samplingsystem independent of the vibration controller and without the COLA data acquisition system.

关 键 词：航天器 正弦扫频 带通滤波 数据处理 

分 类 号：V416.2[航空宇航科学与技术—航空宇航推进理论与工程]