發(fā)布時間：2018-08-18 07:36

【摘要】：為適應未來戰(zhàn)爭環(huán)境,電子戰(zhàn)平臺常配備了多種不同功能的電磁設備,這可能會導致作戰(zhàn)平臺機械性能受損,降低其生存能力,同時各個電子設備間也可能存在電磁干擾。為解決上述問題,綜合一體化裝備應運而生。因此,實現(xiàn)作為電子戰(zhàn)平臺的基本組成的雷達與通信系統(tǒng)的一體化,其意義十分重大。此外,在民用方面,出于安全性的考慮,車與車間互相交換安全相關信息。而一些安全設備,比如自適應巡航控制或制動輔助系統(tǒng)都離不開雷達技術。故感知通信一體化系統(tǒng)也可以用于民用場景,如車載系統(tǒng)。本文針對基于chirp與OFDM信號的感知通信一體化波形進行了研究。在系統(tǒng)中,雷達與通信共享發(fā)射端但具備各自的接收端。本文的主要內(nèi)容如下。第一、二章簡要介紹了感知通信一體化的研究背景與基礎知識。在通信方面,本文討論了分析chirp信號的重要工具——分數(shù)階傅里葉變換(Fractional Fourier Transform,FRFT)。在雷達方面,本文給出了雷達方程的簡單形式、雷達波形匹配濾波以及波形模糊函數(shù)的概念,其中模糊函數(shù)由于能刻畫波形與對應匹配濾波器的特征而在本文中被用來分析一體化波形的雷達感知性能。在基于chirp信號的一體化波形研究中,本文在第三章針對通過updown chirp信號正交和頻率正交混合的方式實現(xiàn)的感知通信一體化波形,研究了相干檢測算法和基于FRFT的非相干檢測算法,并通過仿真比較了不同檢測算法之間的性能。在雷達感知性能方面,第三章對比了單一雷達信號與兩種混合信號的模糊函數(shù),得出結論信號混合對雷達感知性能基本無影響。第三章討論的混合波形雖然對信號的通信誤碼率與雷達感知性能影響不大,但兩種信號同時發(fā)射影響了雷達信號發(fā)射功率,從而減小了雷達作用距離。因此,第四章研究了兩種僅用一個chirp信號實現(xiàn)一體化的波形——基于chirp擴頻(Chirped Spectrum Spread,CSS)的一體化波形和基于不同初始頻率的chirp一體化波形。但是,這兩種波形的使用都存在一個明顯的問題,即通信數(shù)據(jù)率過低。為解決此問題,本文在第五章中以車聯(lián)網(wǎng)(Vehicle-to-Vehicle,V2V)為背景,研究了基于OFDM的感知通信一體化系統(tǒng)的模型和參數(shù)設計,并推導和仿真了該參數(shù)下OFDM信號的模糊函數(shù),給出了該信號通過24GHz ISM信道后的通信性能,結果顯示該參數(shù)取值下的OFDM信號是一種車聯(lián)網(wǎng)環(huán)境下良好的感知通信一體化信號。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN957.51

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本文編號：2188778