摘要
基于FFT频谱分析方法的数字比相技术相对模拟比相技术而言,具有精度高、对信号信噪比要求低、能同时测定多个目标距离等优点,运用频域比相测距的基本原理,分析了相差的极大似然估计,导出了测距误差的卡拉-美罗下界(CRLB),最后通过仿真验证了频域比相测距算法的有效性.
Digital phase comparison based upon FFT has many advantages such as high accuracy, low signal to noise ratio （SNR） and range measurement of many targets at one time. Basic principle of ranging by frequency domain phase comparison is applied, maximum likelihood （ML） estimation of phase difference analyzed, and Cramer-Rao lower bound （CRLB） to ranging error examined. Finally simulation results verify the effectiveness of the algorithm of ranging by frequency domain phase comparison.
出处
《空军雷达学院学报》
2005年第2期9-11,共3页
Journal of Air Force Radar Academy
关键词
离散观测
频域比相
极大似然估计
卡拉-美罗下界
discrete-time observation
frequency domain phase comparison
ML estimation
CRLB
