【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。更多还原

【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 on the velocity measurement precision,frequency spectrum analysis based on fast Fourier transform is used.A linear adjustment method of frequency estimation is proposed according to the ascending or descending principle of target exterior trajectory.The 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 resolution.The frequency estimation precision is improved using the frequency spectrum phase information of adjacent continuous truncation of the signal.The simulation and practical result show that high frequency estimation precision can be obtained even at a low signal noise ratio.更多还原