毕业设计（论文）-多普勒雷达的高精度测速弹道系数仿真研究.doc

摘要

针对连续波多普勒雷达外弹道测速的特点。为了解决频率分辨率与采样频率影响多普勒雷达速度测量精度的问题,提出应用快速傅里叶变换的频谱分析法。该方法基于目标弹道升、降规律对估计频率进行线性调整,能有效提高多普勒雷达的作用距离、测试精度和抗干扰能力,避免由于频率分辨率不够而出现连续相同的速度值。利用信号相邻两次截断后的频谱相位信息能提高频率估计精度。仿真结果和外场试验表明该方法在较低信噪比下,仍可以得到很高的频率估计精度。
利用多普勒雷达的高精度测速信息,对弹道系数进行了仿真研究,分析了雷达的测量精度对弹道系数估计误差的影响。仿真结果表明,引入测速信息能大幅度提高弹道系数的估计精度,在一定的雷达测量精度下,基于弹道系数特性的识别速度快,精度高,简单直观,具有现实价值。
关键词:多普勒;阻力系数;快速傅里叶变换;雷达测量;精度;
Abstract


According to the feature of exterior ballistic velocity measurement for continuous wave Doppler radar,in order to solve the problem that the frequency resolution and the sampling frequency may bring negative effects Oil the velocity measurement precision,frequency spectrum analysis based on fast Fourier transform is linear adjustment method of frequency estimation is proposed according to the ascending or descending principle of target exterior method improves the measuring distance and precision and the anti-jamming ability of the system and avoids the appearance of continuously same velocity from inadequate frequency frequency estimation precision is improved using the frequency spectrum phase information of adjacent continuous truncation of the simulmion and practical result show that high frequency estimation
precision can be obtained even at a low signal noise ratio.
Using the Doppler radar’S high precision velocity information,the ballistic coefficient’s characteristic of reentry process is emulated and effect of radar precision to the ballistic coefficient estimate is result shows that the precision of ballistic coefficient is highly advanced with the velocity information,and under a certain measurement precision of radar,it is fast,simple and intuitionistic to identify targets by using the ballistic coefficent is feasible to recognize the missile by the ballistic coefficient.
Key words:Doppler;drag coefficient; fast Fourier transform; measurement of radar;precision
目录
绪论··