天发舰收高频雷达一阶海杂波电磁散射研究
发布时间：2019-07-06 09:07
【摘要】：天发舰收高频雷达是对传统固定平台条件下天地波雷达系统的进一步延伸和发展,相比于天发岸收体制提高了雷达的机动性,然而由于舰载平台运动的影响,使得作为海面状态参数反演信息来源和海上目标检测背景的一阶海杂波呈现出更多特点,因此研究一阶海面回波谱有助于天发舰收高频雷达在目标检测和海洋遥感领域的理论和应用研究。本文从信号处理角度分析了一阶海杂波的空时分布及展宽特性,从电磁散射理论的角度,研究了混合传播路径下高频雷达系统逐渐复杂的一阶海杂波雷达截面积方程。首先,建立了天发舰收高频雷达混合传播路径的几何模型,说明了固定群距离下海面散射轨迹的椭圆分布,推导了一阶海杂波多普勒频率公式,并分析了系统布局对空时分布曲线的影响。此外,在两种阵列布局下,针对单根天线、均匀线性阵列,分别研究了擦地角和双基地角、舰船运动及电离层相位污染影响下的一阶海杂波展宽效应,最后分析了多因素复合作用下的一阶海杂波展宽效应。接下来从电磁散射的角度,由混合传播路径的几何关系,推导了电偶极子作为激励源通过混合路径传播后位于接收天线处的频域电场方程;随后根据Walsh的电磁散射理论,假设电离层和海面为随机过程,推导了单基地、双基地高频雷达混合传播路径下的一阶海杂波RCS方程,并仿真分析了不同电离层扰动状态、系统布局、风向及雷达工作频率对一阶谱的影响。最后通过双基地天发岸收高频雷达实验平台采集的实测数据对建立的一阶海杂波模型进行了验证。最后,根据舰载平台运动的几何运动位移关系,修正了混合传播路径的电场方程,并推导了舰载平台匀速直线运动时天发舰收高频雷达一阶海杂波RCS方程,通过仿真实验研究了不同参数对一阶海杂波谱的影响;由于海面的复杂环境,舰载平台在匀速运动过程中必然存在着舰船的六维运动,由舰船六维运动的定义及六维运动模型,分析了六维运动对海面回波散射路径的影响;在以上工作基础上,分别推导了六维运动作用下的一阶海杂波RCS方程,表明六维运动使得一阶海杂波产生了调制谱,并分析了海态对一阶谱的影响。
文内图片：
图片说明：天发舰收高频雷达系统布局示意图
[Abstract]:Tianfa ship receiving high frequency radar is a further extension and development of heaven and earth wave radar system under the condition of traditional fixed platform. Compared with Tianfa receiving system, it improves the maneuverability of radar. However, due to the influence of shipborne platform motion, the first order sea clutter, which is the source of inversion information of sea surface state parameters and the background of marine target detection, shows more characteristics. Therefore, the study of first-order sea surface echo spectrum is helpful to the theoretical and applied research of Tianfa ship receiving high frequency radar in the field of target detection and marine remote sensing. In this paper, the space-time distribution and broadening characteristics of first-order sea clutter are analyzed from the point of view of signal processing. From the point of view of electromagnetic scattering theory, the cross-section area equation of first-order sea clutter radar system under mixed propagation path is studied. Firstly, the geometric model of the hybrid propagation path of the receiving high frequency radar is established, the elliptical distribution of the sea surface scattering trajectory at a fixed group distance is explained, the Doppler frequency formula of the first order sea miscellaneous wave is derived, and the influence of the system layout on the space-time distribution curve is analyzed. In addition, under two kinds of array layouts, for a single antenna and a uniform linear array, the broadening effects of first-order sea clutters under the influence of erasing angle and bistatic angle, ship motion and ionosphere phase pollution are studied respectively. finally, the broadening effect of first-order sea clutters under the action of multi-factor combination is analyzed. Then, from the point of view of electromagnetic scattering, from the geometric relationship of the mixed propagation path, the frequency domain electric field equation at the receiving antenna after the electric dipole is propagated through the mixed path as the excitation source is derived. Then, according to Walsh's electromagnetic scattering theory, assuming that the ionosphere and sea surface are random processes, the first-order sea clutter RCS equation under the mixed propagation path of unistatic and bistatic high frequency radar is derived, and the effects of different ionosphere disturbance states, system layout, wind direction and radar frequency on the first-order spectrum are simulated and analyzed. Finally, the first-order sea clutter model is verified by the measured data collected by bistatic Tianfa receiving HF radar experimental platform. Finally, according to the geometric motion displacement relationship of shipborne platform motion, the electric field equation of hybrid propagation path is modified, and the RCS equation of first-order sea clutter of shipborne platform with uniform linear motion is derived. the influence of different parameters on the first-order sea clutter spectrum is studied by simulation experiments. Because of the complex environment of the sea surface, there must be the six-dimensional motion of the ship in the process of uniform motion of the shipborne platform. according to the definition of the six-dimensional motion of the ship and the six-dimensional motion model, the influence of the six-dimensional motion on the scattering path of the sea surface echo is analyzed. On the basis of the above work, the first-order sea clutter RCS equation under the action of six-dimensional motion is derived, which shows that the six-dimensional motion makes the first-order sea clutter produce modulation spectrum, and analyzes the influence of sea state on the first-order spectrum.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958
本文编号：2510913
文内图片：
图片说明：天发舰收高频雷达系统布局示意图
[Abstract]:Tianfa ship receiving high frequency radar is a further extension and development of heaven and earth wave radar system under the condition of traditional fixed platform. Compared with Tianfa receiving system, it improves the maneuverability of radar. However, due to the influence of shipborne platform motion, the first order sea clutter, which is the source of inversion information of sea surface state parameters and the background of marine target detection, shows more characteristics. Therefore, the study of first-order sea surface echo spectrum is helpful to the theoretical and applied research of Tianfa ship receiving high frequency radar in the field of target detection and marine remote sensing. In this paper, the space-time distribution and broadening characteristics of first-order sea clutter are analyzed from the point of view of signal processing. From the point of view of electromagnetic scattering theory, the cross-section area equation of first-order sea clutter radar system under mixed propagation path is studied. Firstly, the geometric model of the hybrid propagation path of the receiving high frequency radar is established, the elliptical distribution of the sea surface scattering trajectory at a fixed group distance is explained, the Doppler frequency formula of the first order sea miscellaneous wave is derived, and the influence of the system layout on the space-time distribution curve is analyzed. In addition, under two kinds of array layouts, for a single antenna and a uniform linear array, the broadening effects of first-order sea clutters under the influence of erasing angle and bistatic angle, ship motion and ionosphere phase pollution are studied respectively. finally, the broadening effect of first-order sea clutters under the action of multi-factor combination is analyzed. Then, from the point of view of electromagnetic scattering, from the geometric relationship of the mixed propagation path, the frequency domain electric field equation at the receiving antenna after the electric dipole is propagated through the mixed path as the excitation source is derived. Then, according to Walsh's electromagnetic scattering theory, assuming that the ionosphere and sea surface are random processes, the first-order sea clutter RCS equation under the mixed propagation path of unistatic and bistatic high frequency radar is derived, and the effects of different ionosphere disturbance states, system layout, wind direction and radar frequency on the first-order spectrum are simulated and analyzed. Finally, the first-order sea clutter model is verified by the measured data collected by bistatic Tianfa receiving HF radar experimental platform. Finally, according to the geometric motion displacement relationship of shipborne platform motion, the electric field equation of hybrid propagation path is modified, and the RCS equation of first-order sea clutter of shipborne platform with uniform linear motion is derived. the influence of different parameters on the first-order sea clutter spectrum is studied by simulation experiments. Because of the complex environment of the sea surface, there must be the six-dimensional motion of the ship in the process of uniform motion of the shipborne platform. according to the definition of the six-dimensional motion of the ship and the six-dimensional motion model, the influence of the six-dimensional motion on the scattering path of the sea surface echo is analyzed. On the basis of the above work, the first-order sea clutter RCS equation under the action of six-dimensional motion is derived, which shows that the six-dimensional motion makes the first-order sea clutter produce modulation spectrum, and analyzes the influence of sea state on the first-order spectrum.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958
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