摘要
针对高动态环境下接收机的接收信号含有较大多普勒频率及其变化率,传统捕获方法无法对多普勒频率变化率进行有效补偿的问题,提出了基于分段自相关分数阶傅里叶变换的高动态目标检测方法。该方法首先对接收信号进行载频预测,将接收信号调制到基带信号,然后利用分数阶傅里叶变换对线性调频信号在最优阶次具有能量聚集的特点,采用分段自相关与离散分数阶傅里叶变换相结合的处理方法,快速而准确的估计出多普勒频率及其变化率。仿真验证表明,该方法解决了传统方法在高动态环境下难以对信号多普勒变化率进行有效补偿的问题,并提高了检测信噪比和接收机捕获概率。
The received signal contained large Doppler frequency and its changing rate was high when the receiver in high dynamic environment,and traditional methods could not capture the changing rate of Doppler frequency for effective compensation.Aiming at this problem,a high dynamic target detection method based on fractional Fourier transform was proposed.This method first projected the receiving signals＇ carrier frequency,Then using fractional Fourier transform of linear frequency modulation signal of the characteristics of energy in the optimal order times.The method of segmented autocorrelation combined discrete fractional Fourier transform to process the signal quickly and accurately.The theoretical analysis and simulation showed that this method could solve the problem that the traditional methods could not capture the changing rate of Doppler frequency for effective compensation,and improved the detection SNR and receiver＇s capture probability.
出处
《探测与控制学报》
CSCD
北大核心
2016年第1期37-41,共5页
Journal of Detection & Control
基金
国家自然科学基金项目资助(61001111)
关键词
高动态
捕获
线性调频
分数阶傅里叶变换
检测
high dynamic
capture
linear？frequency？modulation
fractional Fourier transform
detection
