摘要
在远程通信时,由于单阵元接收信噪比低,导致通信误码率较高,为了提高接收信噪比,设计了用于水下无人航行器的小型声接收基阵;给出了一种改进的波束综合方法,并通过该方法设计了接收多波束系统;针对远程通信中,时域波束切换算法无法跟踪信源方位的缺点,给出了适用于MFSK调制方式的频域波束切换算法。利用计算机对实验结果进行分析,该基阵可以提供5dB左右的信噪比增益。25km通信距离下采用设计的多波束系统接收信号,解码无误码。
In long range circumstance, the performance of the communication system is limited by the low receiving SNR. In order to increase the SNR of the received signal, a small array composed of four sensors which can be used in UUV underwater communication system is designed. An enhanced beam synthesis algorithm which can be used to synthesize the multi-beams is proposed. A frequency domain switching beam algorithm is used in the designed multi-beams receiving system. The lake test data are analyzed by computer. The resuhs show that there is 5 dB SNR increase by using the designed array. And in MFSK（Multiple Frequency-Shift Keying） communication tests, there is no error occurred during the communication period.
出处
《电声技术》
2008年第10期72-74,81,共4页
Audio Engineering
基金
国家自然科学基金(60572098)
关键词
水声通信
基阵
多波束
underwater acoustic communication
array
multi-beam
