公开(公告)号：US08127138B1

公开(公告)日：2012-02-28

申请号：US12287156

申请日：2008-09-29

申请人： Robert S. Lynch ,  G. Clifford Carter ,  Bijan Mobasseri

发明人： Robert S. Lynch ,  G. Clifford Carter ,  Bijan Mobasseri

IPC分类号： H04L9/32 ,  H04L9/00 ,  G01S15/00 ,  G01S3/80 ,  G01R25/00 ,  G01R23/00 ,  G01R23/16 ,  G01R13/00

CPC分类号： G01S7/52001 ,  G01S7/536 ,  G01S15/325 ,  G01S15/50

摘要： The invention as disclosed is of a method to authenticate identify and trace sonar transmissions and echoes by embedding transparent, secure and robust digital watermarks in signal space, where the additional information incurs no cost in bandwidth. The complex short time Fourier transform is selected as the domain for embedding the digital watermark, secured by a secret key, in the time frequency representation of the signal. The watermark is designed through an iterative optimization step. This step insures that the watermarked sonar is also realizable. Selection of the time frequency region for watermarking is driven by avoidance of interference with the sonar itself, or in case of network operation, other watermarks. In addition, the selected time-frequency region remains robust to sound channel and other transmission effects. Sonar echoes are authenticated in the time-frequency plane by a correlation receiver tuned to the watermarked region using the secret key.

摘要翻译： 所公开的本发明是通过在信号空间中嵌入透明，安全和鲁棒的数字水印来鉴别和跟踪声纳传输和回波的方法，其中附加信息不带宽带来成本。 选择复杂的短时傅立叶变换作为用于嵌入由密钥保护的数字水印在信号的时间频率表示中的域。 通过迭代优化步骤设计水印。 此步骤确保水印的声纳也可实现。 用于水印的时间频率区域的选择是通过避免与声纳本身的干扰，或在网络操作的情况下，其他水印来驱动的。 另外，所选择的时间 - 频率区域对于声道和其它传输效果保持稳健。 声纳回波通过使用秘密密钥调谐到水印区域的相关接收机在时频平面中进行认证。