星载雷达杂波图景的建模与仿真
发布时间：2019-06-19 15:23
【摘要】：星载雷达(SBR)在现代生产生活中扮演的角色越来越重要,它克服了地面雷达、舰载雷达和机载雷达的诸多缺点,有着全天候、探测空域非常大、预警时间长、不受领空限制等优点,在民用和军事领域发挥着不可替代的作用。星载雷达也有种种难以解决的问题,其中之一便是其杂波的处理比地面、机载和舰载雷达的杂波处理要复杂。星载雷达发射的电磁波会覆盖地面或海洋一个巨大的区域,从而产生大量的杂波。同时,雷达平台和地球无时无刻不处于快速移动当中,所以还会产生不可忽视的多普勒效应。波束脚印越大,影响雷达性能的干扰源就越多,这使得照射区域产生的杂波信号会严重的污染目标信号。要从被污染过的回波信号中准确的检测出目标,就必须先对杂波做有效的处理。因此关于星载雷达杂波的研究就变得非常有意义。在不用实测的情况下、仅借助计算机平台就得到杂波信号,被称为杂波的模拟。它与地面/机载等雷达的杂波的模拟有相近或相同之处,但由于星载雷达自身的特点,所以也大量不同的地方。本文所做的研究工作主要是星载雷达杂波的模拟和仿真,采取方法为:利用雷达回波与发射波形的一般关系,根据波束所覆盖的实际区域建立杂波模型。仿真中用到的特定地区的各种参数、地球转动的数据、地物特性、高程数据由地理信息系统(GIS)提供;杂波的后向散射系数、多普勒频移、天线增益等数据来自于星载雷达本身的工作参数。本文所做的主要工作如下:1.分析星载雷达杂波模拟的意义和前人所做的工作,介绍常用的模拟方法以及杂波的概率分布,讨论基于地理信息系统建立的杂波模型思路和优势;2.通过计算和作图,推导星载雷达杂波的研究中所涉及的关键参数。其中包括卫星平台的参数、波束的参数、照射区域的参数等;3.建立星载雷达杂波模型。运用矩形网格映像法,将雷达波束照射的实际区域进行分块,利用地理信息系统提供的参数,计算出各杂波小块的各个参数;4.对实际的波束照射区域进行杂波仿真、生成最终杂波。利用雷达方程,推导出杂波小块回波信号与发射信号的关系,并利用实际地面的各个参数模拟出杂波;5.对杂波的性能进行分析、总结,探讨存在的问题。
[Abstract]:Space-borne radar (SBR) plays a more and more important role in modern production and life. It overcomes many shortcomings of ground radar, shipborne radar and airborne radar. It has the advantages of all-weather, very large airspace detection, long early warning time, no airspace restriction and so on. It plays an irreplaceable role in civil and military fields. There are also many difficult problems to be solved in space-borne radar, one of which is that the clutter processing is more complex than that of ground, airborne and shipborne radar. The electromagnetic waves emitted by space-borne radar will cover a large area of the ground or ocean, resulting in a large number of clutters. At the same time, the radar platform and the earth are moving rapidly all the time, so they will also produce Doppler effect that can not be ignored. The larger the beam footprint, the more interference sources affect the radar performance, which makes the clutter signal generated in the irradiated area seriously pollute the target signal. In order to detect the target accurately from the contaminated echo signal, it is necessary to deal with the clutter effectively. Therefore, the research on the clutter of space-borne radar becomes very meaningful. In the absence of actual measurement, the clutter signal is obtained only with the help of computer platform, which is called the simulation of clutter. It is similar to or similar to the simulation of ground / airborne radar, but because of the characteristics of space-borne radar, there are a lot of different places. The research work done in this paper is mainly the simulation and simulation of space-borne radar clutter. the method is as follows: using the general relationship between radar echo and transmit waveform, the clutter model is established according to the actual area covered by beam. The parameters used in the simulation, the data of earth rotation, the characteristics of ground objects and the elevation data are provided by Geographic Information system (GIS). The data of backscattering coefficient, Doppler frequency shift and antenna gain of clutter come from the working parameters of space-borne radar itself. The main work done in this paper is as follows: 1. This paper analyzes the significance of space-borne radar clutter simulation and the work done by its predecessor, introduces the commonly used simulation methods and the probability distribution of clutter, and discusses the ideas and advantages of the clutter model based on geographic information system (GIS). 2. Through calculation and mapping, the key parameters involved in the research of space-borne radar clutter are derived. These include the parameters of the satellite platform, the parameters of the beam, the parameters of the irradiation area, etc. The clutter model of space-borne radar is established. By using the rectangular grid image method, the actual area irradiated by radar beam is divided into blocks, and the parameters of each clutter block are calculated by using the parameters provided by geographic information system (GIS). 4. The actual beam irradiation area is simulated to generate the final clutter. The relationship between the echo signal and the transmitted signal is derived by using the radar equation, and the clutters are simulated by using the parameters of the actual ground. The performance of clutter is analyzed, summarized and the existing problems are discussed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.52
本文编号：2502441
[Abstract]:Space-borne radar (SBR) plays a more and more important role in modern production and life. It overcomes many shortcomings of ground radar, shipborne radar and airborne radar. It has the advantages of all-weather, very large airspace detection, long early warning time, no airspace restriction and so on. It plays an irreplaceable role in civil and military fields. There are also many difficult problems to be solved in space-borne radar, one of which is that the clutter processing is more complex than that of ground, airborne and shipborne radar. The electromagnetic waves emitted by space-borne radar will cover a large area of the ground or ocean, resulting in a large number of clutters. At the same time, the radar platform and the earth are moving rapidly all the time, so they will also produce Doppler effect that can not be ignored. The larger the beam footprint, the more interference sources affect the radar performance, which makes the clutter signal generated in the irradiated area seriously pollute the target signal. In order to detect the target accurately from the contaminated echo signal, it is necessary to deal with the clutter effectively. Therefore, the research on the clutter of space-borne radar becomes very meaningful. In the absence of actual measurement, the clutter signal is obtained only with the help of computer platform, which is called the simulation of clutter. It is similar to or similar to the simulation of ground / airborne radar, but because of the characteristics of space-borne radar, there are a lot of different places. The research work done in this paper is mainly the simulation and simulation of space-borne radar clutter. the method is as follows: using the general relationship between radar echo and transmit waveform, the clutter model is established according to the actual area covered by beam. The parameters used in the simulation, the data of earth rotation, the characteristics of ground objects and the elevation data are provided by Geographic Information system (GIS). The data of backscattering coefficient, Doppler frequency shift and antenna gain of clutter come from the working parameters of space-borne radar itself. The main work done in this paper is as follows: 1. This paper analyzes the significance of space-borne radar clutter simulation and the work done by its predecessor, introduces the commonly used simulation methods and the probability distribution of clutter, and discusses the ideas and advantages of the clutter model based on geographic information system (GIS). 2. Through calculation and mapping, the key parameters involved in the research of space-borne radar clutter are derived. These include the parameters of the satellite platform, the parameters of the beam, the parameters of the irradiation area, etc. The clutter model of space-borne radar is established. By using the rectangular grid image method, the actual area irradiated by radar beam is divided into blocks, and the parameters of each clutter block are calculated by using the parameters provided by geographic information system (GIS). 4. The actual beam irradiation area is simulated to generate the final clutter. The relationship between the echo signal and the transmitted signal is derived by using the radar equation, and the clutters are simulated by using the parameters of the actual ground. The performance of clutter is analyzed, summarized and the existing problems are discussed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.52
【参考文献】
相关期刊论文 前1条
1 张长隆;雷达信号模拟器中的杂波仿真模型[J];航天电子对抗;2003年06期
，本文编号：2502441
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