CAJ | 학술논문

频谱分析是研究弹丸在炮膛内运动特征的重要对象。由于弹丸在膛内运行过程中，受到烟、尘、电磁等干扰使弹丸回波信号产生严重的噪声，对直接使用时频分析法分析弹丸回波信号的频谱产生严重影响，传统的小波去噪、数字滤波会使信号处理后丢失有效信息，影响后续弹丸速度测量的精度。提出了基于最小二乘法对信号数据进行拟合处理去噪，并对拟合方法进行改进，通过STFT法对原始信号和拟合处理后的信号进行分析比较，验证了方法的可行性。
빈보분석시연구탄환재포당내운동특정적중요대상。유우탄환재당내운행과정중，수도연、진、전자등간우사탄환회파신호산생엄중적조성，대직접사용시빈분석법분석탄환회파신호적빈보산생엄중영향，전통적소파거조、수자려파회사신호처리후주실유효신식，영향후속탄환속도측량적정도。제출료기우최소이승법대신호수거진행의합처리거조，병대의합방법진행개진，통과STFT법대원시신호화의합처리후적신호진행분석비교，험증료방법적가행성。
Spectrum analysis is the study of the projectile in bore within the movement characteristics of the important objects. As a result of the projectile in bore during operation,the disturbance of smoke, dust and electromagnetic makes the projectile echo signal have serious noise, Analysis on direct use of time-frequency analysis method the projectile serious impact echo signal spectrum, The traditional wavelet denoising after processing and digital filtering make the signal lost the effective information and affect the precision of subsequent projectile velocity measurement. Lost signal's original features. Based on the least square method is proposed in this paper to fitting the signal data denoising, and timproved the fitting method. Then through the STFT method to the original signal and the fitting of processed signal time-frequency analysis and comparison. The feasibility of the method is validated.