基于多相濾波的信道化DRFM系統(tǒng)設(shè)計(jì)
[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.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TP333
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