线性调频-伪码复合信号参数的快速估计  

Fast Parameter Estimation of LFM- PRBC Combined Signal

作　　者：刘勇[1] 张国毅[1] 田润澜[1] 齐兴龙[1] 

机构地区：[1]空军航空大学信息对抗系,长春130022

出　　处：《电子信息对抗技术》2015年第1期53-58,共6页Electronic Information Warfare Technology

摘　　要：针对目前算法中线性调频-伪码(LFM-PRBC)复合信号参数估计计算量较大的问题,提出了一种快速估计算法。该算法采用相关检测与解线调进行参数的估计。首先对信号进行平方以消除相位调制,然后由自相关的峰值距离估计出码元宽度,由互相关的正负恢复出编码规律,再根据延时直接对信号解线调,最终估计出调频斜率与起始频率。仿真结果表明,该算法在低信噪比(SNR)下具有较好的估计性能。To solve the problem that the parameter estimation of linear frequency modulation-pseudo random binary codes （ LFM-PRBC） combined signal requires a large amount of compu-tation in current algorithms, a fast parameter estimation algorithm which uses correlation detec-tion and dechirp is proposed. Firstly, the square of the received signal is computed to eliminate the phase modulation. Then, the width of the symbol is estimated from the peak distance of auto-correlation. The sign of the cross-correlation is used to recover the pseudo-code sequence. Fi-nally, dechirp is directly adopted to obtain chirp rate and the initial frequency according to the delay of the signal. The results of simulation show that this algorithm has a good performance un-der low Signal-to-Noise Ratio （ SNR） .

关 键 词：线性调频-伪码 相关检测 解线调 参数估计 

分 类 号：TN971.1[电子电信—信号与信息处理]