多普勒雷达测量弹丸转速的DDA法应用研究  

Application and Study of DDA on Projectile Rotating-speed Measured by Doppler Radar

作　　者：谭渊[1] 杨勇[1] 黄居敏[1] 袁乃昌[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《弹道学报》2010年第4期27-30,共4页Journal of Ballistics

基　　金：国家自然科学基金项目(60871069);国防预研基金项目

摘　　要：针对旋转弹丸转速的测量,对底部刻槽弹丸的雷达(散射)截面积和转速进行了理论分析,给出了转速计算公式,运用现代谱估计的状态矢量空间直接数据近似方法代替传统的快速傅里叶变换算法,对回波信号进行了频谱估计,在不同信噪比下对其频谱估计能力进行了仿真计算和实验测试,给出了信噪比与测量误差之间的关系曲线.结果表明:在低信噪比的情况下,相比传统快速傅里叶变换算法,该高精度转速测量方法的测试精度明显提高.Aiming at the rotating-speed measurement of rotating projectile,the radar cross section（RCS） and rotating speed of projectile with slot at the bottom were analyzed,and the formula for finding rotating speed was proposed.The modern spectral estimation of the state space direct data approximation（DDA）was adopted to estimate the spectrum of echo signals instead of general fast Fourier transform（FFT）arithmetic.The simulation and test were carried out to evaluate the spectral estimation of this new proposed arithmetic under different signal-to-noise ratio.The relation graph of measurement errors and signal-to-noise ratio was given.Compared with FFT arithmetic,the method evidently improves the precision of speed measurement.

关 键 词：弹丸 转速测量 刻槽 状态空间 多普勒雷达 

分 类 号：TN958[电子电信—信号与信息处理]