基于多相滤波的信道化DRFM系统设计

发布时间：2018-11-18 06:47

【摘要】：新体制雷达广泛采用相干处理技术和匹配接收技术，，使得传统的干扰方法干扰性能降低。数字射频存储器(DRFM)能够存储雷达信号，保持干扰信号与雷达信号的相参性，适应多变、快变和复杂时频调制的威胁信号环境，具有良好的干扰效果，已经成为电子对抗系统的核心部件。信道化技术作为软件无线电系统的关键技术之一，能够从宽频带内提取子带信号便于后续的基带处理，广泛应用于宽带接收机中。本文将信道化技术引入到DRFM系统中，只对有信号的子信道进行存储和转发，大大减小了存储容量。而基于多相滤波结构的信道化技术又能降低数据速率，便于对信号进行延时、频率调制。本文的研究内容包括以下几个方面： 1.从多速率信号处理理论入手，推导了抽取器和内插器的多相滤波结构。并将其应用于信道化接收机和发射机中，从理论上推导了多相滤波结构的信道化接收机和发射机的实现结构。 2.分析了DRFM的工作原理、实现结构、量化方式、存储方式和性能参数以及国内外发展现状。 3.设计了信道化的DRFM系统，给出了系统的原理框图，详细分析了各个模块功能和实现方法，并对多相滤波结构的信道化接收机和发射机进行了仿真。 4.使用Verilog HDL语言设计了多相滤波结构的两个关键模块：FIR滤波器和并行FFT模块，并使用Modelsim进行了仿真验证。
[Abstract]:Coherent processing and matching and receiving techniques are widely used in the new radar system, which makes the jamming performance of the traditional jamming methods degrade. Digital RF memory (DRFM) can store radar signal, keep the coherence between jamming signal and radar signal, adapt to the threat signal environment of changeable, fast change and complex time-frequency modulation, and have good jamming effect. It has become the core component of electronic countermeasure system. Channelization is one of the key technologies in software radio systems. It can extract subband signals from a wide frequency band for subsequent baseband processing and is widely used in wideband receivers. In this paper, the channelization technique is introduced into DRFM system, and only the signal subchannels are stored and forwarded, which greatly reduces the storage capacity. The channelization technology based on polyphase filter structure can reduce the data rate and facilitate the delay and frequency modulation of the signal. The research content of this paper includes the following aspects: 1. Based on the theory of multirate signal processing, the poly-phase filter structure of decimator and interpolator is deduced. It is applied to channelized receiver and transmitter, and the realization structure of channelized receiver and transmitter with polyphase filter structure is deduced theoretically. 2. The working principle, realization structure, quantization mode, storage mode and performance parameters of DRFM are analyzed. 3. The channelized DRFM system is designed, the principle block diagram of the system is given, the functions and implementation methods of each module are analyzed in detail, and the channelized receiver and transmitter with polyphase filter structure are simulated. 4. Two key modules of polyphase filter structure are designed with Verilog HDL language: FIR filter and parallel FFT module, and the simulation results are verified by Modelsim.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP333

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