| 引用本文: | 唐殿皓，陈章友，易先洲. 提高干涉法反演横向速度准确度研究[J]. 雷达科学与技术, 2022, 20(3): 328-334.[点击复制] |
| TANG Dianhao, CHEN Zhangyou, YI Xianzhou. Study on Improving Accuracy of Lateral Velocity Inversion by Interference Method[J]. Radar Science and Technology, 2022, 20(3): 328-334.[点击复制] |
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| 摘要: |
| 针对高频地波雷达使用双通道干涉法反演横向速度时，如果目标回波信噪比较低，反演得到的横向速度误差大的问题，提出将通道中多帧信号进行积累后提取通道间相位差时间变化率来反演横向速度的方法。从公式推导出发证明了其可行性，并通过仿真验证了该方法可以提高目标信号信噪比，从而得到准确的目标回波相位差变化率，进而能够有效提取低信噪比目标信号的横向速度。通过实测数据处理验证了相干积累用于高频地波雷达反演横向速度的有效性。最后对本方法实际应用的局限性进行了分析，指出了观测时间和目标加速度对提取结果的影响。 |
| 关键词: 高频地波雷达 横向速度 电波干涉 相干积累 |
| DOI：DOI:10.3969/j.issn.1672-2337.2022.03.012 |
| 分类号:TN951 |
| 基金项目: |
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| Study on Improving Accuracy of Lateral Velocity Inversion by Interference Method |
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TANG Dianhao, CHEN Zhangyou, YI Xianzhou
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School of Electronic Information, Wuhan University, Wuhan 430072, China
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| Abstract: |
| When the high-frequency surface wave radar(HFSWR) uses the two-channel interference method to retrieve the lateral velocity, large error exists in the obtained lateral velocity under low signal-to-noise ration(SNR) of target echo. In order to solve this problem, coherent integration is adopted to extract the time change rate of phase difference between channels.The feasibility of the method is proved from the derivation of the formula. The simulation proves that the method can improve the SNR of the target signal,so as to get the accurate change rate of the phase difference of the target echo,and then effectively extract the lateral velocity of the target signal with low SNR.The effectiveness of coherent accumulation for lateral velocity inversion of HFSWR is verified by the measured data processing.In the end, the limitation of this method is analyzed, the influences of observation time and target acceleration on the extraction results are pointed out. |
| Key words: high-frequency surface wave radar (HFSWR) lateral velocity radio wave interferometry coherent integration |
