高斯噪声下伪码-线性调频复合信号参数提取方法  

Parameter Extraction Method of Radar Signal Combined PRBC and LFM with Gaussian Noise

作　　者：沈伟[1,2] 赵拥军[1] 刘成城[1] 贾新海[2] 

机构地区：[1]解放军信息工程大学信息工程学院 [2]中国人民解放军95870部队

出　　处：《数据采集与处理》2012年第4期450-455,共6页Journal of Data Acquisition and Processing

基　　金：国家高技术研究发展计划("八六三"计划)(2009AA7034530)资助项目

摘　　要：针对目前雷达信号参数估计算法在某种环境中性能急剧下降,甚至失效的问题,提出一种基于多相滤波器组和高阶累积量联合处理的伪码-线性调频复合信号参数估计算法。该算法首先利用多相滤波器组实现信号在频域上快速均匀划分,然后对输出的每个子带信号进行三阶累积量对角切片的短时估计,有效抑制高斯噪声的干扰,并经过包络检波后得到复合信号完整的时频矩阵,最后通过时频图像的Radon变换和频率曲线的提取实现信号伪码数目、码元宽度、调频斜率、信号载频、带宽以及起止频率的提取。仿真结果表明,该方法在信噪比大于-11dB时的估计精度较高。To estimate the parameters of radar signals combined pseudo-random binary phase code （PRBC） and linear frequency modulation （LFM） in low SNR, a novel method is proposed based on the poly-phase filter bank and high-order cumulant. Firstly, it realizes rapid uniformtivision of signals in the frequency domain by the poly-phase filter bank. Then, the Gaussian noise can be suppressed by using the short-time estimate of the third-order cumulant on each narrow frequency band. The estimation of the whole time-frequency matrices can be obtained with envelope detection. Finally, the chirp rate, the code-width and the code-length of comp- site signal can be estimated by Radon transform of time-frequency images. At the same time, the carrier frequency, the band width, the start-stop frequency can also be estimated by extracting the frequency curves. Simulation results show that all parameters of the compsite signal can be precisely evaluated when SNR is more than --11 dB.

关 键 词：线性调频 伪随机二相编码 多相滤波器 三阶累积量 RADON变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]