双基地MIMO雷达通信一体化中的处理与实现

发布时间：2018-02-23 01:21

本文关键词： 双基地MIMO雷达雷达/通信一体化信号共享时分复用信号设计　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：通信系统类似于双基地雷达的神经中枢,在双基地雷达制导体系中发挥着重要作用,如今将雷达与通信结合成雷达/通信一体化系统已是必然趋势,它主要通过对两系统的软、硬件资源进行合理分配,得到机动能力强、小型轻量化和多功能化的一体化系统。本文探讨了一体化系统的信号设计与处理。由于双基地雷达避免了单基地雷达的距离盲区问题,允许其平台上的通信系统采用半双工的通信方式,所以在工作方式上,双基地雷达与通信系统更兼容。MIMO技术应用在通信中能够增加信道容量;应用在雷达中,通过宽波束发射和宽波束接收的工作模式,能够获得覆盖范围广、搜索效率高、抗截获等优点。随着MIMO雷达、MIMO通信体制的发展,两者的系统结构和关键参数也越来越相似。选取MIMO雷达平台可以实现雷达和通信的优势互补。而双基地MIMO雷达可以使以上各优点集中在一个平台,考虑以双基地MIMO雷达为背景的雷达/通信一体化可以更高效地利用系统资源。本文主要开展的工作内容如下:(1)整合了雷达/通信一体化的硬件共享方式,探讨了一体化系统的分类和系统设计。根据雷达探测和数据传输的工作时间,研究了基于双基地MIMO雷达的两种一体化系统,分别是时分复用系统和共享系统,其中共享系统是研究重点。(2)在时分复用系统中,选择OFDM信号作为通信信号,并对定时同步算法和通信性能进行仿真,探讨了时间分配和通信系统工作流程问题。(3)在共享系统中,提出一种共享信号的设计方法:利用遗传算法优化出满足条件的正交二相码,再与扩频码编码方法结合就得到满足MIMO雷达要求的共享信号。在共享信号的同步处理中,采用滤波器对扩频码进行捕获和雷达中的多普勒频率估计方法进行频偏估计,再用扩频码解码方法提取通信信息。性能分析中,首先验证共享信号不会对雷达性能造成影响,然后仿真误信率并与常规MIMO通信信号对比,结果表明共享信号有很高的数据率,能够满足大批量的数据传输要求。
[Abstract]:The communication system is similar to the nerve center of bistatic radar and plays an important role in bistatic radar guidance system. Now it is an inevitable trend to combine radar with communication into an integrated radar / communication system. Reasonable allocation of hardware resources, strong mobility, This paper discusses the signal design and processing of the integrated system. The bistatic radar avoids the range blind area problem of the mono-static radar. In operation mode, bistatic radar is more compatible with communication system. MIMO technology can increase channel capacity in communication, and can be used in radar. With the development of MIMO radar communication system, it is possible to obtain the advantages of wide coverage, high search efficiency, anti-interception and so on through the operation mode of wide-beam transmission and wide-beam reception. The system structure and key parameters of the two systems are more and more similar. The MIMO radar platform can realize the complementary advantages of radar and communication, while the bistatic MIMO radar can make the above advantages concentrate on one platform. Considering that the radar / communication integration with bistatic MIMO radar background can make more efficient use of system resources. The main work of this paper is as follows: 1) integrating the hardware sharing mode of radar / communication integration. The classification and system design of integrated system are discussed. According to the working time of radar detection and data transmission, two integrated systems based on bistatic MIMO radar are studied, which are time-division multiplexing system and shared system, respectively. In the time division multiplexing system, the OFDM signal is selected as the communication signal, and the timing synchronization algorithm and communication performance are simulated, and the time allocation and communication system workflow problem. In this paper, a design method of shared signal is proposed: the orthogonal two-phase code satisfying the condition is optimized by genetic algorithm, and then the shared signal satisfying the requirements of MIMO radar is obtained by combining with the spread spectrum code coding method. In the synchronous processing of the shared signal, The filter is used to capture the spread spectrum code and the Doppler frequency estimation method in radar is used to estimate the frequency offset, and then the spread spectrum code decoding method is used to extract the communication information. In the performance analysis, it is first verified that the shared signal will not affect the radar performance. Then the error rate is simulated and compared with the conventional MIMO communication signal. The results show that the shared signal has a high data rate and can meet the requirements of mass data transmission.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN958

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