Wideband Waveform Design and Performance Analysis for Multiple Unmanned Underwater Vehicle Cooperative Detection Sonar
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摘要: 相比于空中的电磁波信号,水下的声波信号传播速度小、频率低,多普勒效应和窄带信号处理方法严重影响多无人水下航行器(multi-UUV)协同探测声呐对运动目标的探测性能。该文基于Costas序列和正交频分线性调频(OFD-LFM)波形,设计了离散频率编码非正交线性调频波形(DFCW-NOFD-LFM),并将该波形与二进制相移键控(BPSK)、离散频率编码波形(DFCW)等传统码分多址(CDMA)波形进行了性能比较。结果表明,所设计波形具有大多普勒容限、良好的自相关与互相关性能和优秀的抗混响能力,有望应用于多UUV协同探测声呐,以提高其运动目标探测性能。Abstract: The speed and frequency of underwater sound wave are much lower compared with the electromagnetic wave in the air. The moving target detection performance of multiple Unmanned Underwater Vehicle(multi-UUV) cooperative detection sonar is seriously influenced by the Doppler effect and narrowband signal processing. In this paper, the Discrete Frequency Coding Waveform of Non-Orthogonal Frequency Division Linear Frequency Modulation(DFCW-NOFD-LFM) based on Costas sequence and Orthogonal Frequency Division Linear Frequency Modulation(OFD-LFM) waveform is designed for multi-UUV cooperative detection sonar. The performance comparisons between the designed waveform and the traditional Code Division Multiple Access(CDMA) waveforms such as Binary Phase Shift Keying(BPSK), Discrete Frequency Coding Waveform(DFCW) are carried out. The results show that the designed DFCW-NOFD-LFM has large Doppler tolerance, good performance of auto-correlation, cross-correlation and reverberation suppression. It may be applied to the multi-UUV cooperative detection sonar to improve the relative moving target detection performance.
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表 1 各波形的自相关旁峰与互相关峰(dB)
波形 自相关旁峰ASP 互相关峰CP BPSK –15.24 –15.66 DFCW –0.90 –10.75 DFCW-OFD-LFM –17.72 –10.89 DFCW-NOFD-LFM –20.48 –10.92 表 2 不同多普勒速度时波形的PLSR值与ISLR值(dB)
波形 速度(kn) –40 –5 0 5 40 PLSR BPSK –6.02×10–4 –5.18×10–4 –15.24 –6.13×10–4 –1.27 DFCW –0.27 –0.09 –0.90 –0.09 –0.27 DFCW-OFD-LFM –0.62 –2.83 –17.72 –2.83 –0.62 DFCW-NOFD-LFM –2.02 –13.29 –20.48 –13.29 –2.02 ISLR BPSK 12.58 10.40 0.16 10.39 12.57 DFCW 13.36 14.96 8.17 14.96 13.36 DFCW-OFD-LFM 11.05 3.78 –1.16 3.78 11.05 DFCW-NOFD-LFM 9.82 4.01 –1.93 4.01 9.82 -
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