王亚许,张艳,张蓉竹.起始波长误差对合成孔径激光雷达成像的影响[J].光电子激光,2018,29(5):479~484 |
起始波长误差对合成孔径激光雷达成像的影响 |
Influence of starting wavelength error on imaging of SAL |
投稿时间:2017-09-29 |
DOI: |
中文关键词: 合成孔径激光雷达 可调谐激光器 起始波长误差 成像质量 非线性 |
英文关键词:synthetic apeture laser (SAL) tunable laser starting wavelength error imaging quality,nonlinearity |
基金项目:国家自然科学基金(61505036)和贵州省科技厅基金项目(黔科合J字[2015]2009号)资助项目 (1.四川大学 电子信息学院,四川 成都 610064; 2.贵阳学院电子与通信工程学院,贵州 贵阳 550005) |
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中文摘要: |
合成孔径激光雷达采用的可调谐激光器通常不够 稳定,导致存在起始波长误差。本文研究可调谐激光器起始 波长误差对合成孔径激光雷达成像的影响。建立了具有起始波长误差的可调谐激光器输出信 号经合成孔径激光雷达 系统后的成像模型,利用Matlab进行模拟仿真,详细讨论了起始波长误差对合成孔径激光 雷达在方位向和距离向成 像的影响。结果表明,起始波长误差对合成孔径图像的距离向分辨率没有影响,但是恶化了 方位向成像质量。起始 波长误差对方位向成像的主瓣强度影响不大,主要影响了点目标的旁瓣从而造成方位向成像 质量恶化。起始波长误差在(0,2λc)和(0,λc)内服从均匀分 布时主瓣宽度分别约为理想情况下的2倍和1.5倍;起始波长误差在(0,0.1λc) 内服从均匀分布时,对主瓣宽度的影响可以忽略,对旁瓣仍有较明显的影响;起始波 长误差在(0,0.02λc)内服从均匀分布时,对旁瓣的影响可以忽略。可调谐激光 器起始波长为1550nm时,起始波 长误差控制在0.02个波长,方位向成像的质量比较高。对起始波长误 差恶化方位向分辨率的本质进 行了探讨,得出起始波长 误差恶化方位向分辨率的本质是导致了多普勒频率的非线性。 |
英文摘要: |
The tunable source used in the synthetic aperture laser (SAL) radar is not s ufficiently stable while stable sources are not broadly tunable,leading to the fluctuations in the wavelength at the start of the scan,namely the starting wav elength error.In this paper,the effect of the starting wavelength error of the tunable source on the imaging of SAL is studied.An ima ging model of tunable laser output signal with starting wavelength errors is established.Th e simulation is carried out using MATLAB. The results show that the starting wavelength error deteriorates the azimuth ima ging but has no effect on the range resolution.The starting wavelength error has little e ffect on the main lobe amplitude of the azimuthal imaging.The main lobe is 2times and 1.5times of the ideal main lobe under uniform distributions of (0,2λc)and(0,λc) respectively.When less than (0,0,1λc),the effect of the main lobe wi dth can be negligible.There is still a significant effect on the side lobe.If less than (0,0.02λ c),the effect on the side lobe can be negligible.Furthermore,the nonlinearity of Doppler frequency caused by starting wavelength error is the reason that the azimuth imaging is de teriorated. |
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