将不同长度线性调频(Linear Frequency Modulation,LFM)信号装入矢量信号源,其载波频率设置为中频,分别采样其输出的不同长度的LFM信号,对输出的LFM信号进行脉冲压缩Matlab仿真处理.实验表明,在采样频率及输出幅度相同的条件下,102.00 μs脉冲内LFM信号仿真处理后的信噪比和旁瓣抑制比,相较3.00 μs的指标提高了13.35 dB和4.61dB.进一步说明了由组合脉冲组成的LFM发射波形信号,其脉压体制雷达存在近距离回波比远距离回波差问题.提出了一种复杂海洋环境下多目标探测方法,对海用脉压体制雷达真实回波性能进行了改善和提升.
Research on Multi-target Detection of Linear Frequency Modulation Signal in Complex Marine Environment
The Linear Frequency Modulation(LFM)signals with different lengths are loaded into the vector signal source,and its carrier frequency is set as intermediate frequency.The LFM signals with different lengths are sampled respectively,and the pulse com-pression simulation processing is carried out through Matlab.Experiments show that under the same sampling frequency and output am-plitude,the signal-to-noise ratio and sidelobe rejection ratio of 102.00 μs pulse internal LFM signal after simulation processing are 13.35 dB and 4.61 dB higher than 3.00 μs respectively.It is further explained that the pulse compression radar has the problem that the short-range echo is worse than the long-range echo.Finally,multi-target detection method in complex marine environment is proposed to improve the real echo performance of marine pulse compression radar.
vector signal sourceLFMpulse compressionMatlab simulationmulti-target detection
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