综合电子系统一体化技术研究

发布时间：2018-03-01 08:14

本文关键词： 综合电子系统一体化线性调频干扰多音干扰数字射频存储器快速独立分量分析　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：在信息化战争中，通信、雷达侦察一体化和干扰一体化属于综合电子系统范畴，通过一体化可以提高装备的效能。在一定的物理载荷限制条件下，一体化装备可以根据作战任务的改变，灵活地重配置和自适应，这具有很重要的实际意义。本文设计了一个综合电子系统，并对其一体化过程中的关键技术展开了研究，在此基础上完成该综合电子系统的一体化仿真。首先，结合本课题所针对的目标对象的特性，分析了通信系统、雷达系统及各自的干扰系统之间的异同，在硬件系统宽带设计的基础上，通过软件无线电和系统软硬件重构技术，论述了上述电子系统综合一体化的可能性。在此基础上，完成了综合电子系统的设计，为后文的研究奠定了基础。其次，选取了某通信数据链作为研究对象，搭建该通信系统，搭建后的系统可称为软扩频跳频系统。该通信系统在误比特率指标0.1的情况下，系统所能忍受的信噪比SNR在-20dB以下。针对该软扩频跳频通信系统，采用了基于线性调频干扰样式和多音干扰样式的宽带阻塞式干扰技术。实验结果表明，分频段瞄准线性调频干扰样式达到0.1的误比特率指标所需信干比SJR约-8dB；多音干扰样式达到0.1的误比特率指标所需信干比SJR约-10dB，并且干扰信道数为10左右的干扰性能最佳，干扰频偏应选为0.25MHz或1.25MHz。基于该软扩频跳频通信系统的宽带阻塞式干扰技术，综合电子系统可以实现对类似通信系统的有效对抗。然后，选取某线性调频脉冲压缩体制雷达作为研究对象，结合该雷达工作方式的特点，采用了基于数字射频存储器的移频转发干扰样式和间歇采样转发干扰样式。实验结果表明，经过幅度加权的移频转发干扰样式的幅度可识别特征得到了弱化，并可产生空间位置超前和滞后假目标；间歇采样转发干扰在不移频的情况下可在一定距离范围内产生空间位置超前和滞后假目标；两者结合，可产生大量逼真的空间位置超前和滞后假目标。该基于数字射频存储器的线性调频脉冲压缩体制雷达的干扰技术，作为综合电子系统关键技术之一，并为后续的一体化仿真提供了基础。最后，针对同频段信号分离问题，本文引入了基于快速独立分量分析算法的盲源分离技术。实验结果表明，该技术能很好地将硬件滤波器无法分离的同频段通信、雷达混合信号进行分离，算法收敛概率为92.3%；通过频谱偏斜度可以正确识别信号分离结果，解决了独立分量分析算法信号分离次序不唯一而带来的信号识别问题。在此基础上，进行了综合电子系统一体化综合仿真，，验证了本文所设计的综合电子系统的合理性和可行性。
[Abstract]:In the information war, the integration of communication, radar reconnaissance and jamming belongs to the category of integrated electronic system, through which the efficiency of equipment can be improved. Integrated equipment can be reconfigured and adapted flexibly according to the change of operational tasks, which is of great practical significance. In this paper, an integrated electronic system is designed, and the key technologies in the process of integration are studied. On this basis, the integrated simulation of the integrated electronic system is completed. Firstly, according to the characteristics of the target object, the similarities and differences among communication system, radar system and their jamming system are analyzed, and on the basis of the broadband design of hardware system, the paper analyzes the differences and similarities between the communication system, the radar system and their respective jamming systems. Through the software radio and software / hardware reconfiguration technology, the possibility of the integration of the electronic system mentioned above is discussed, and the design of the integrated electronic system is completed, which lays a foundation for the later research. Secondly, a communication data link is selected as the research object, and the communication system can be called soft spread spectrum frequency hopping system. The signal-to-noise ratio (SNR) of the system is below -20dB. For the soft spread spectrum hopping communication system, a wideband blocking jamming technique based on LFM jamming and multi-tone jamming is adopted. The experimental results show that, The signal-to-interference ratio (SJR) is about -8dB for aiming at the error bit rate (BER) of 0.1 and SJR is about -10dB for multi-tone jamming, and the interference performance is the best when the number of interference channels is about 10. The interference frequency offset should be chosen as 0.25 MHz or 1.25 MHz. Based on the wideband blocking jamming technology of the soft spread spectrum hopping communication system, the integrated electronic system can effectively resist the similar communication system. Then, a linear frequency modulation pulse compression radar is selected as the research object. The frequency shift and forward jamming mode based on digital RF memory and the intermittent sampling forward jamming mode are adopted. The experimental results show that the amplitude recognizable feature of the amplitude weighted frequency shift forward interference pattern is weakened. In addition, spatial position lead and lag false target can be produced, intermittent sampling and forwarding interference can produce space position lead and lag false target in a certain range of distance without frequency shift. The jamming technology of LFM pulse compression radar based on digital RF memory is one of the key technologies of integrated electronic system. And provides the foundation for the subsequent integrated simulation. Finally, a blind source separation technique based on fast independent component analysis (FICA) algorithm is introduced to solve the problem of signal separation in the same frequency band. The experimental results show that this technique can communicate well with the same frequency band where the hardware filter can not be separated. The convergence probability of radar mixed signal is 92.3. The result of signal separation can be correctly identified by spectrum deflection, which solves the problem of signal recognition caused by the non-unique signal separation order of independent component analysis (ICA) algorithm. The rationality and feasibility of the integrated electronic system designed in this paper are verified.
【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】：2014
【分类号】：TN972

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