基于最小二乘法和STFT的弹丸回波信号估计分析  

Estimates of radar echo signal and spectrum analysis based on the least square method and STFT

作　　者：刘丹[1] 张丕状[1] 马春燕[1] 

机构地区：[1]中北大学信息探测与处理技术研究所

出　　处：《电子设计工程》2015年第17期131-134,共4页Electronic Design Engineering

摘　　要：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。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.

关 键 词：内弹道 弹丸运动 最小二乘法 STFT时频分析 

分 类 号：TN929.5[电子电信—通信与信息系统]