Experimental study of cross-medium communication of millimeter wave radar on a wave tank
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摘要: 利用毫米波雷达探测由水下设备声波激励的水面微幅波有望实现水下设备对外无线跨介质通信。水面波动效应研究对实现基于毫米波雷达微幅波探测的跨介质通信具有重要价值。针对此, 文中在波浪水槽中对二进制相移键控和二进制频移键控调制信号跨介质通信开展了实验, 测试分析了不同幅度水面波动对跨介质通信的影响, 评估了基于空间分集技术的通信性能。实验结果表明, 中等水面波动对毫米波雷达跨介质通信性能的影响最小, 基于多通道合并的空间分集技术能提升波动水面上的跨介质通信质量。文中的研究可为基于毫米波雷达微幅波探测的跨介质通信技术在波动水面实际应用提供参考。Abstract: The wireless cross-domain communication technology for underwater equipment is an important challenge that urgently needs to be solved in marine technology. Millimeter wave radar could solve this problem by detecting the micro-wave vibration excited by sound waves on the water surface. Studying the impact of water surface waves is of great value for millimeter wave radar-based cross-medium communication. The recently introduced millimeter wave radar based cross-domain communication technology has not been extensively studied in terms of its impact on water surface waves. This article conducted cross-medium communication experiments on BPSK and BFSK modulation signals on a wave tank, tested and analyzed the impact of different amplitude water surface waves on cross-medium communication, and estimated the performance improvement of conventional spatial diversity technology. The experimental results show that moderate water surface waves have the least impact on the performance of millimeter wave radar-based cross-medium communication, and multi-channel data merging can improve cross-medium communication performance to a certain extent on wavy water surfaces. The research results of this article can provide a reference for practical applications of millimeter wave radar-based cross-medium communication on wavy water surfaces.
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Key words:
- millimeter wave radar /
- cross-medium /
- wireless communication /
- wave tank /
- micro-wave
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图 2 声源级为185 dB时不同频率不同深度微幅波振幅
Figure 2. The amplitude of micro-waves at different frequencies and depths for 185 dB/
$ \mathit{\mu } $ pa sound
图 3 微幅波在77 GHz雷达中产生的相位变化
Figure 3. Phase changes generated by micro-waves in 77 GHz radar
图 4 理想点声源(50 Hz)激励微幅波
Figure 4. Micro-wave excited by an ideal point sound source (50 Hz)
图 5 声波束激励的微幅波三维分布
Figure 5. Three-dimensional distribution of micro-waves excited by sound beam
图 6 声波在不同水深中衰减(假设为圆柱形传播衰减)
Figure 6. Sound wave attenuation in different water depths (assuming cylindrical propagation attenuation)
图 7 线性调频波形以及频率示意图
Figure 7. Linear frequency modulation waveform and frequency schematic diagram
图 10 信号处理流程图
Figure 10. Comparison of pitch angle velocity between simulation curves and experiment data
图 11 不同推程时波高仪记录的水面波动
Figure 11. The water surface fluctuations recorded by the wave height meter when the push plate stroke is 20 cm, 40 cm, and 70 cm
图 12 不同音量下振幅分布直方图
Figure 12. Histograms of amplitude distribution at different volumes
图 13 不同推程下SNR分布直方图
Figure 13. Histograms of SNR distribution under different push distances
图 14 不同推程下莱斯因子分布直方图
Figure 14. Histograms of Rice factor distribution under different push distances
图 15 不同推程下误码率分布直方图
Figure 15. Histograms of error rate distribution under different push distances
图 16 BFSK和BPSK各通道以及合并通道误码率
Figure 16. Error rate of BFSK and BPSK channels and joint channels
图 17 莱斯因子与水面波动对比
Figure 17. Comparison between Rice factor and water surface fluctuations
表 1 雷达参数列表
Table 1. Parameters of radar system
参数名称 数值 频率/GHz 77 带宽/GHz 3.06 脉冲采样点 256 脉冲周期/us 100 脉冲数 255×256 天线波束宽度 30°, 80° 
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表 2 不同推程下雷达数据统计表
Table 2. BFSK data statistics table
推程
/mm波高
/cmBFSK BPSK SNR
/dB莱斯
因子SNR
/dB莱斯
因子20 2 −12.1 1.8 −13.5 2.1 30 4 −2.3 6.4 −5.2 7.2 40 6 −5.5 21.1 −2.9 15.7 50 8 −5.7 3.2 −4.9 10.1 60 9 −6.5 2.8 −9.8 2.8 70 10 −7.4 3.3 −10.7 2.6
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