摘要
为提高无人船的安全性、雷达目标探测精度和通信效率,提出一种在船舶间集成无线激光通信与激光雷达的正交频分复用-线性调频(Orthogonal Frequency Division Multiplexing-Linear Frequency Modulation,OFDM-LFM)一体化信号系统。运用比尔-朗伯定律、瑞利散射及菲涅耳公式对水面光学特性进行建模,分别考察了水面对光的吸收、散射以及水面起伏对光信号的影响。分析了16进制正交振幅调制(16-Quadrature Amplitude Modulation,16QAM)、正交相移键控(Quadrature Phase Shift Keying,QPSK)、二进制相移键控(Binary Phase Shift Keying,BPSK)以及最小频移键控(MinimumShiftKeying,MSK)4种调制方式下系统的通信误码性能,并在确保一体化系统雷达速度分辨率的条件下,引入脉冲压缩技术来提升雷达的距离分辨率。仿真结果表明,无人船OFDM-LFM激光雷达通信一体化信号系统在BPSK调制方式下具有最优性能,其误码率在信噪比为8dB时可达到10^(-5)以下,优于传统连续相位调制(ContinuousPhaseModulation,CPM)下的OFDM-LFM系统3.5dB;一体化信号系统经过脉冲压缩处理后,具有5.9m的最佳距离分辨率和2.04081m/s的速度分辨率。
The integration of optical wireless communication(OWC)and lidar is proposed in this study to enhance the safety,radar target detection accuracy,and communication efficiency of unmanned ships.The orthogonal frequency division multiplexing-linear frequency modulation(OFDM-LFM)system is utilized for this purpose.In order to examine absorption,scattering,and the impact of water surface fluctuations on optical signals,the optical characteristics of the water surface are modeled using the Beer-Lambert law,Rayleigh scattering,and the Fresnel formula.The bit error rate(BER)performance of the integrated system is analyzed under four modulation schemes:16-quadrature amplitude modulation(16QAM),quadrat-ure phase shift keying(QPSK),binary phase shift keying(BPSK),and minimum shift keying(MSK).Pulse compression technology is introduced in this study to enhance distance resolution while maintaining a radar velocity resolution for the in-tegrated system.Simulation results indicate that optimal performance is achieved by employing BPSK modulation with a BER below 10^(-5) at a signal-to-noise ratio of 8 dB.The performance achieved by employing BPSK modulation surpasses tra-ditional continuous phase modulation(CPM)modulation in OFDM-LFM systems by 3.5 dB.After pulse compression pro-cessing,the integrated signal system exhibits superior distance resolution of 5.9 m and velocity resolution of 2.04081 m/s.
作者
封斌
张凌雲
吕志胜
黄媛
曹明华
FENG Bin;ZHANG Lingyun;LV Zhisheng;HUANG Yuan;CAO Minghua(School of Information and Communication Engineering,Guangzhou Maritime University,Guangzhou 510725,China;School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《舰船科学技术》
北大核心
2024年第19期100-106,共7页
Ship Science and Technology
基金
国家自然科学基金资助项目(62265010,61875080)
广东省企业科技特派员项目(GDKTP2021041300)。
关键词
无人船
雷达通信一体化
无线光通信
OFDM-LFM
unmanned ship
lidar communication integration
optical wireless communication
OFDM-LFM
作者简介
封斌(1974-),男,博士,高级工程师,研究方向为船联网、船岸协同感知、航道感知。
