伪码-线性调频信号快速参数估计算法  

A Fast Parameter Estimation Approach for Multiplicative Signal Combined PRBC and LFM

作　　者：张佳芬[1] 和小冬[1] 唐斌[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《电讯技术》2009年第12期100-104,共5页Telecommunication Engineering

摘　　要：现有复杂调制雷达信号参数估计算法计算量较大,且要求部分先验信息已知,针对此缺点,提出了一种伪码-线性调频乘性复合信号的快速参数估计算法。通过建立基于循环自相关函数的统计量,估计信号的码速率;采用平方法消除相位突变后快速解线调,估计信号的起始频率和调制斜率。算法求解没有先后顺序,不存在传递误差。仿真结果表明信噪比大于等于1 dB时,算法已能精确估计出信号各参数且实时性较好。The existing complex modulated radar signal parameters estimation algorithms have high computational complexity and require some prior informations. To solve these problems,a fast parameter estimation algorithm is proposed for a compound signal which is comprised of a pseudo- random binary phase code （PRBC） signal multiplied by a linear frequency modulation （LFM） signal. By establishing statistics based on cyclic autocorrelation function, the code rate of the compound signal can be estimated. While, after the PRBC component is removed from the compound signal with an amplitude- squared method, the initial frequency and chirp rate of the signal can be estimated by using a fast dechirp algorithm. The proposed algorithm has no error propagation and has lower computational complexity and higher accuracy, when SNR 〉 1dB, all parameters of the compound signal can be evaluated precisely.

关 键 词：低截获概率雷达 伪随机二相编码 线性调频 参数估计 

分 类 号：TN971.1[电子电信—信号与信息处理]