有色噪声背景下的水声跳频信号参数估计  

Parameter estimation of underwater acoustic frequency-hopping signals in colored noise

作　　者：姚帅[1] 方世良[1] 王晓燕[1] 

机构地区：[1]东南大学水声信号处理教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2014年第1期12-18,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11104141;11104029);中央高校基本科研业务费专项资金资助项目(3204003301);声纳技术国防科技重点实验室开放基金资助项目(KF201201)

摘　　要：针对现有跳频信号参数估计方法未考虑有色噪声的影响,且估计精度与速度难以兼得的问题,提出了一种有色噪声背景下的水声跳频信号参数估计方法.该方法首先根据水声信号有色噪声背景的特点,对有色噪声进行白化处理;然后,在详细推导分析跳频信号短时傅里叶变换时频脊线的特征的基础上,给出了跳频信号跳周期和起跳时间的估计方法;最后,基于估计得到的跳周期和起跳时间,进一步估计跳频频率.理论分析和仿真结果表明,该方法计算量小,工程实用性强,在有色噪声背景下可以实现跳频信号参数的快速稳健估计.For the existing parameter estimation methods of the frequency-hopping （FH） signals, colored noise is without consideration and the estimation accuracy and speed are mutually exclusive. To solve these problems, a method is proposed for the parameter estimation of underwater acoustic FH signals in colored noise. The colored noise is first whitened according to the features of underwa- ter acoustic colored noise. Then, based on detailed derivation and analysis for the characteristics of the short time Fourier transform time-frequency distribution maxima of the FH signals, methods for estimating the hop duration and hop timing are given. Finally, the hopping frequencies are estimated using the estimated hop duration and hop timing. The theoretical analysis and simulation results show that the proposed method has a small amount of computation amount and can be easily realized in practice. The parameters of underwater acoustic FH signals in colored noise can be estimated fast and robustly by the proposed method.

关 键 词：有色噪声 短时傅里叶变换 时频脊线 峰均功率比 跳频信号 

分 类 号：TN911.72[电子电信—通信与信息系统]