抗饱和自适应抗干扰技术
发布时间：2018-10-24 16:32
【摘要】：随着空间电磁环境的日益复杂,设备接收机极易受到干扰信号的影响,导致分析的结果出现误差,部分接收机甚至出现饱和现象,而无法正常工作,对日常的生活影响非常大。人们常用的导航GPS接收机或者北斗接收机由于需要高灵敏的感应微弱信号,在强干扰的情况下接收机由于功率放大器放大倍数较大的原因很容易出现饱和而无法进行定位和导航;手机基站或者移动基站附近的干扰源会使其无法正常获取用户的需求,同样手机客户端用户也没办法联络到基站,造成通信的间断和失联。同时工作在饱和状态的发射机因为功率放大器的非线性效应,会产生带外信号,对其他设备造成不必要的干扰。避免功率放大器的非线性效应,可以理解为发射机的抗饱和技术。所以,接收机抗饱和和抗干扰技术以及发射机的抗饱和技术在现在和未来都有很大的研究意义。本文首先介绍了抗干扰技术和抗饱和技术的研究现状。以天线阵列为主,详细介绍了空域滤波抗干扰技术的原理和波束形成的准则,同时对空时自适应抗干扰技术进行了阐述。空域滤波可以在波达方向角(DOA)已知和未知的情况下进行。对于DOA信息的估计和获取,第三章详细的分析了具有高分辨率的多重信号分类(MUSIC)估计算法,并进行了仿真实验。为了提高估计分辨率和降低硬件设计复杂度,提出了简单矢量阵列的DOA估计方法,同时给出了基于旋转阵列的DOA估计的解模糊方法。针对现有的功率放大器的非线性模型提出了基于稀疏时延的改进模型,并简要介绍了AGC的概况。AGC抗饱和方法有一个致命的缺陷,那就是其对有用信号的放大倍数会因强干扰的影响而变得很小,导致接收机无法正常分析信号。文中提出了基于射频端的幅相加权的抗饱和模块在抑制强干扰的同时,能够保证有用信号的增益不会受到严重的影响,并给出了一种基于两级等效阵列的抗饱和抗干扰方案。最后文章针对导航接收设备易因强干扰而出现饱和现象这一特定的情况,给出了整体抗饱和自适应抗干扰的系统方案,并在FPGA平台上对系统涉及的算法进行编程设计。分析解决了软件设计中存在的问题,最后通过在暗室的实验验证了算法的可行性。
[Abstract]:With the increasing complexity of the space electromagnetic environment, the equipment receiver is easily affected by the interference signal, which leads to the error of the analysis results, some receivers even appear saturation phenomenon, and can not work normally, which has a great impact on the daily life. The commonly used navigation GPS receivers or Beidou receivers require sensitive weak signals. In the case of strong interference, the receiver can not locate and navigate easily because of the high magnification of the power amplifier, and the interference source near the mobile phone base station or mobile base station will make it unable to obtain the user's demand normally. The same mobile phone client users can not contact the base station, resulting in communication interruption and loss of connection. Because of the nonlinear effect of the power amplifier, the transmitter operating in saturation state will produce out-of-band signals, which will cause unnecessary interference to other equipments. Avoiding the nonlinear effect of power amplifier can be understood as the anti-saturation technology of transmitter. Therefore, the anti-saturation and anti-jamming technology of receiver and the anti-saturation technology of transmitter have great significance in the present and future. This paper first introduces the research status of anti-jamming technology and anti-saturation technology. Based on antenna array, the principle of spatial filtering anti-jamming technology and the principle of beamforming are introduced in detail, and the space-time adaptive anti-jamming technology is also described. Spatial filtering can be performed when the DOA (DOA) is known and unknown. For the estimation and acquisition of DOA information, the (MUSIC) estimation algorithm with high resolution is analyzed in detail in chapter 3, and the simulation experiment is carried out. In order to improve the resolution and reduce the complexity of hardware design, the DOA estimation method of simple vector array is proposed, and the method of DOA estimation based on rotating array is presented. Based on the existing nonlinear model of power amplifier, an improved model based on sparse delay is proposed, and the general situation of AGC is briefly introduced. The anti-saturation method of AGC has a fatal defect. That is, the amplification of the useful signal becomes very small because of the strong interference, resulting in the receiver can not analyze the signal normally. In this paper, an anti-saturation module based on the amplitude additive weight of RF terminal is proposed, which can suppress the strong interference while ensuring that the gain of the useful signal will not be seriously affected. A new anti-saturation anti-jamming scheme based on the two-stage equivalent array is proposed. Finally, in view of the special situation that navigation receiving equipment is prone to saturation due to strong interference, the system scheme of anti-saturation adaptive anti-jamming is presented, and the algorithm involved in the system is programmed on FPGA platform. The problems in software design are analyzed and solved. Finally, the feasibility of the algorithm is verified by experiments in the darkroom.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN97
[Abstract]:With the increasing complexity of the space electromagnetic environment, the equipment receiver is easily affected by the interference signal, which leads to the error of the analysis results, some receivers even appear saturation phenomenon, and can not work normally, which has a great impact on the daily life. The commonly used navigation GPS receivers or Beidou receivers require sensitive weak signals. In the case of strong interference, the receiver can not locate and navigate easily because of the high magnification of the power amplifier, and the interference source near the mobile phone base station or mobile base station will make it unable to obtain the user's demand normally. The same mobile phone client users can not contact the base station, resulting in communication interruption and loss of connection. Because of the nonlinear effect of the power amplifier, the transmitter operating in saturation state will produce out-of-band signals, which will cause unnecessary interference to other equipments. Avoiding the nonlinear effect of power amplifier can be understood as the anti-saturation technology of transmitter. Therefore, the anti-saturation and anti-jamming technology of receiver and the anti-saturation technology of transmitter have great significance in the present and future. This paper first introduces the research status of anti-jamming technology and anti-saturation technology. Based on antenna array, the principle of spatial filtering anti-jamming technology and the principle of beamforming are introduced in detail, and the space-time adaptive anti-jamming technology is also described. Spatial filtering can be performed when the DOA (DOA) is known and unknown. For the estimation and acquisition of DOA information, the (MUSIC) estimation algorithm with high resolution is analyzed in detail in chapter 3, and the simulation experiment is carried out. In order to improve the resolution and reduce the complexity of hardware design, the DOA estimation method of simple vector array is proposed, and the method of DOA estimation based on rotating array is presented. Based on the existing nonlinear model of power amplifier, an improved model based on sparse delay is proposed, and the general situation of AGC is briefly introduced. The anti-saturation method of AGC has a fatal defect. That is, the amplification of the useful signal becomes very small because of the strong interference, resulting in the receiver can not analyze the signal normally. In this paper, an anti-saturation module based on the amplitude additive weight of RF terminal is proposed, which can suppress the strong interference while ensuring that the gain of the useful signal will not be seriously affected. A new anti-saturation anti-jamming scheme based on the two-stage equivalent array is proposed. Finally, in view of the special situation that navigation receiving equipment is prone to saturation due to strong interference, the system scheme of anti-saturation adaptive anti-jamming is presented, and the algorithm involved in the system is programmed on FPGA platform. The problems in software design are analyzed and solved. Finally, the feasibility of the algorithm is verified by experiments in the darkroom.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN97
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