| 引用本文: | 吴 桐， 刘 祥， 江 舸. 脉间跳频雷达高度表回波相关性分析[J]. 雷达科学与技术, 2025, 23(6): 671-682.[点击复制] |
| WU Tong, LIU Xiang, JIANG Ge. Echo Correlation Analysis for Inter-Pulse Frequency Hopping Radar Altimeter[J]. Radar Science and Technology, 2025, 23(6): 671-682.[点击复制] |
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| 摘要: |
| 在雷达高度表系统设计中，为提高系统的信号非相参检测性能和测量精度，需要更低的回波脉间相关性。然而，在高脉冲重复频率下，固定载频的回波脉间相关性与脉冲重复频率呈正相关。本文引入了脉间跳频技术可以降低脉间相关性，但载频随机跳变使得固定载频下的相关性模型不再适用。本文建立雷达高度表照射场景，推导了脉间跳频下回波的脉间相关性模型。基于该模型，本文建立最小化非相参叠加波形方差的优化问题，并使用模拟退火算法进行求解。实验结果表明：当脉间跳频和脉冲重复频率越大时，脉间相关性越小；在高脉冲重复频率下，引入脉间跳频技术可以提高信号检测性能和测高精度。 |
| 关键词: 雷达高度表 脉间跳频 脉间相关性 非相参叠加 优化问题 |
| DOI：DOI:10.3969/j.issn.1672-2337.2025.06.009 |
| 分类号:TN958.6 |
| 基金项目:国家自然科学基金委员会-中国工程物理研究院NSAF联合基金（No.U2130202） |
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| Echo Correlation Analysis for Inter-Pulse Frequency Hopping Radar Altimeter |
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WU Tong, LIU Xiang, JIANG Ge
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Institute of Electronic Engineering, China Academy of Engineering Physics， Mianyang 621999, China
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| Abstract: |
| In the design of radar altimeter systems, in order to enhance the non-coherent signal detection performance and measurement accuracy, lower inter-pulse correlation of echoes is needed. However, at high pulse repetition frequency （PRF）, the echo inter-pulse correlation of fixed-carrier-frequency increases with the PRF. The inter-pulse frequency hopping technology is introduced to reduce the inter-pulse correlation, but the random hopping of carrier frequency makes the conventional correlation model under fixed-carrier-frequency inapplicable. A radar altimeter illumination scenario is established in the paper, and an inter-pulse correlation model for echoes under frequency hopping condition is derived. Based on this model, an optimization problem aimed to minimize the waveform variance in non-coherent superposition is formulated, using a simulated annealing algorithm to solve it. The experimental results show that, the inter-pulse correlation decreases when both the inter-pulse frequency hopping range and the pulse repetition frequency increase. Furthermore, under high PRF conditions, the incorporation of inter-pulse frequency hopping technology can improve signal detection performance and height measurement accuracy. |
| Key words: radar altimeter inter-pulse frequency hopping inter-pulse correlation non-coherent superposition optimization problem |
