融合感知的通信波形关键技术研究

发布时间：2018-08-18 07:36

【摘要】：为适应未来战争环境,电子战平台常配备了多种不同功能的电磁设备,这可能会导致作战平台机械性能受损,降低其生存能力,同时各个电子设备间也可能存在电磁干扰。为解决上述问题,综合一体化装备应运而生。因此,实现作为电子战平台的基本组成的雷达与通信系统的一体化,其意义十分重大。此外,在民用方面,出于安全性的考虑,车与车间互相交换安全相关信息。而一些安全设备,比如自适应巡航控制或制动辅助系统都离不开雷达技术。故感知通信一体化系统也可以用于民用场景,如车载系统。本文针对基于chirp与OFDM信号的感知通信一体化波形进行了研究。在系统中,雷达与通信共享发射端但具备各自的接收端。本文的主要内容如下。第一、二章简要介绍了感知通信一体化的研究背景与基础知识。在通信方面,本文讨论了分析chirp信号的重要工具——分数阶傅里叶变换(Fractional Fourier Transform,FRFT)。在雷达方面,本文给出了雷达方程的简单形式、雷达波形匹配滤波以及波形模糊函数的概念,其中模糊函数由于能刻画波形与对应匹配滤波器的特征而在本文中被用来分析一体化波形的雷达感知性能。在基于chirp信号的一体化波形研究中,本文在第三章针对通过updown chirp信号正交和频率正交混合的方式实现的感知通信一体化波形,研究了相干检测算法和基于FRFT的非相干检测算法,并通过仿真比较了不同检测算法之间的性能。在雷达感知性能方面,第三章对比了单一雷达信号与两种混合信号的模糊函数,得出结论信号混合对雷达感知性能基本无影响。第三章讨论的混合波形虽然对信号的通信误码率与雷达感知性能影响不大,但两种信号同时发射影响了雷达信号发射功率,从而减小了雷达作用距离。因此,第四章研究了两种仅用一个chirp信号实现一体化的波形——基于chirp扩频(Chirped Spectrum Spread,CSS)的一体化波形和基于不同初始频率的chirp一体化波形。但是,这两种波形的使用都存在一个明显的问题,即通信数据率过低。为解决此问题,本文在第五章中以车联网(Vehicle-to-Vehicle,V2V)为背景,研究了基于OFDM的感知通信一体化系统的模型和参数设计,并推导和仿真了该参数下OFDM信号的模糊函数,给出了该信号通过24GHz ISM信道后的通信性能,结果显示该参数取值下的OFDM信号是一种车联网环境下良好的感知通信一体化信号。
[Abstract]:In order to adapt to the future war environment, the EW platform is often equipped with many kinds of electromagnetic equipment with different functions, which may lead to the damage of the mechanical performance of the combat platform and reduce its survivability. At the same time, there may also be electromagnetic interference between the various electronic devices. In order to solve the above problems, integrated equipment emerged as the times require. Therefore, it is of great significance to realize the integration of radar and communication system as the basic component of electronic warfare platform. In addition, in civil, for safety considerations, the car and workshop exchange safety related information. Some safety devices, such as adaptive cruise control or braking auxiliary systems, are inseparable from radar technology. Therefore, the integrated perceptual communication system can also be used in civil scenarios, such as vehicular systems. In this paper, the integrated waveform of perceptual communication based on chirp and OFDM signal is studied. In the system, radar and communication share the transmitter but have their own receiver. The main contents of this paper are as follows. The first and second chapters briefly introduce the research background and basic knowledge of perceptual communication integration. In the field of communication, an important tool for analyzing chirp signals, the fractional Fourier transform (Fractional Fourier transform), is discussed in this paper. In the aspect of radar, this paper gives the simple form of radar equation, the concept of radar waveform matching filter and waveform ambiguity function. The ambiguity function is used in this paper to analyze the radar sensing performance of the integrated waveform because it can describe the characteristics of the waveform and the corresponding matched filter. In the research of integrated waveform based on chirp signal, in the third chapter, we study the coherent detection algorithm and the non-coherent detection algorithm based on FRFT, aiming at the integrated waveform of perceptual communication realized by the way of quadrature of updown chirp signal and quadrature of frequency. The performance of different detection algorithms is compared by simulation. In the aspect of radar sensing performance, the third chapter compares the ambiguity function between the single radar signal and the two mixed signals, and draws the conclusion that the signal mixing has no effect on the radar sensing performance. The hybrid waveform discussed in Chapter 3 has little effect on the communication bit error rate and radar sensing performance, but the transmission power of the two signals simultaneously affects the transmitting power of the radar signal, thus reducing the radar operating range. Therefore, in chapter 4, two kinds of integrated waveforms based on chirp spread spectrum (Chirped Spectrum (Chirped Spectrum) and chirp integrated waveforms based on different initial frequencies are studied. However, there is an obvious problem in the use of these two waveforms, that is, the communication data rate is too low. In order to solve this problem, in the fifth chapter, based on the background of Vehicle-to-Vehiclev (V2V), the model and parameter design of the integrated system of perceptual communication based on OFDM are studied, and the ambiguity function of OFDM signal under this parameter is deduced and simulated. The communication performance of the signal through the 24GHz ISM channel is given. The results show that the OFDM signal with the selected parameters is a good integrated signal of perceptual communication under the environment of vehicle networking.
【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】：TN957.51

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