本文選題：三角波調(diào)頻　切入點：測距測速　出處：《南京理工大學》2017年碩士論文

【摘要】：線性調(diào)頻近程探測系統(tǒng)具有無距離盲區(qū)、低發(fā)射功率、結(jié)構(gòu)簡單等特點,廣泛應用于各個領域,尤其是軍事領域�，F(xiàn)代戰(zhàn)場電磁環(huán)境復雜,人為干擾下的系統(tǒng)性能和抗干擾方法成為研究重點。本文主要包括三角波調(diào)頻近程探測系統(tǒng)干擾分析與抗干擾信號處理技術(shù)研究。首先理論分析了三角波調(diào)頻探測系統(tǒng)的差頻信號,研究了基于線性調(diào)頻Z變換(Chirp Z Transform,CZT)的測距和基于動目標檢測(Moving Target Detection,MTD)的測速算法,通過仿真對算法進行了驗證。其次研究了調(diào)幅干擾和調(diào)頻干擾對系統(tǒng)的干擾機理,仿真結(jié)果表明調(diào)幅干擾和調(diào)頻干擾在特定參數(shù)下均會使系統(tǒng)測距測速性能惡化。根據(jù)干擾信號特性提出基于分數(shù)階傅里葉變換(Fractional Fourier Transform,FrFT)的抗干擾算法,仿真結(jié)果表明在信干比達到-10dB時仍可以有效抑制噪聲調(diào)幅干擾、三角波調(diào)幅干擾和部分噪聲調(diào)頻干擾。然后根據(jù)指標要求完成系統(tǒng)信號處理軟硬件設計,硬件設計包括信號處理板的設計、加工、焊接和調(diào)試。軟件設計為信號處理整體方案的可編程邏輯陣列(Field Programmable Gate Array,FPGA)實現(xiàn),包括算法離散形式推導、程序編寫編譯和功能驗證。最后將信號處理電路和前端射頻天線構(gòu)成完整系統(tǒng),完成外場測距測速實驗和抗干擾實驗。無干擾條件下,外場實測測距和測速誤差均在系統(tǒng)指標允許范圍內(nèi)。施加干擾后通過抗干擾算法大大降低測距測速誤差,達到系統(tǒng)指標要求。
[Abstract]:The linear frequency modulation (LFM) short-range detection system is widely used in various fields, especially in military field, because of its characteristics of no blind area, low transmitting power, simple structure, etc. The electromagnetic environment of modern battlefield is complex. The system performance and anti-jamming methods under artificial interference have become the focus of research. This paper mainly includes interference analysis and anti-jamming signal processing technology of triangular wave FM short-range detection system. Firstly, the theory analysis of triangular wave FM detection is given. The differential frequency signal of the measuring system, The algorithm of ranging based on Chirp Z transform and moving Target detection based on moving target is studied. The algorithm is verified by simulation. Secondly, the interference mechanism of AM jamming and FM jamming to the system is studied. The simulation results show that both AM jamming and FM jamming can worsen the range measurement performance of the system under certain parameters. According to the characteristics of the jamming signal, an anti-jamming algorithm based on fractional Fourier transform (Fractional Fourier transform) is proposed. The simulation results show that noise AM interference, triangular wave AM interference and partial noise FM interference can be effectively suppressed when the signal-to-interference ratio reaches -10dB, and then the hardware and software design of the system signal processing is completed according to the requirements of the index. The hardware design includes the design, processing, welding and debugging of the signal processing board. Finally, the signal processing circuit and the front-end RF antenna are formed into a complete system to complete the field ranging and velocity measurement experiment and anti-jamming experiment. The error of ranging and velocity measurement in the field is within the allowable range of the system index, and the anti-jamming algorithm can greatly reduce the error of ranging and velocimetry after the interference is applied, so as to meet the requirements of the system.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN911.7

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