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Research on Digital Down Conversion Techniques in Digital Signal Processor

Author: YanBin
Tutor: QiaoXiaoLin
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Digitized Radar Wideband digital receiver Digital Down Conversion GC5016
CLC: TN957.51
Type: Master's thesis
Year: 2010
Downloads: 250
Quote: 0
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Abstract


With the continuous development of radar technology, digital radar and software radar will be an inevitable trend for future radar development. Wideband digital receiver as an important element in the radar digitization process, will directly affect the performance of the radar system. Therefore, applications in radar signal processor the IF digital technology, radar signal digital conversion process has important theoretical significance and application value. GC5016 TI produced specifically for digital conversion chip with high-speed multi-channel programmable ability. This article attempts to be applied to the design of the radar signal processing extension, made good use of effects. Basic theory of digital downconversion process, the first to study the bandpass sampling theorem, and in accordance with the specific conditions of the application, no cepstrum sampling theorem, General sampling theorem, zero-IF sampling theorem three bandpass sampling mode; Second, the study of multirate digital signal processing technology, focus on the CIC filter and FIR filter both digital down-conversion process used filter, while research and analysis of multi-stage filter decimation factor allocation formula; Finally, analysis of the basic principle of the orthogonal demodulation of the signal, given the advantages of the orthogonal demodulation, and the IQ imbalance of the channel appears in the orthogonal demodulation process do research. Based on the results of the analysis combined with specific engineering requirements, application Simulink software to simulate the entire digital signal processing extension inverter system, the simulation results are consistent with the conclusions of the theoretical analysis and provide technical support for subsequent engineering practice. Based on theoretical analysis and simulation results, the design of the signal processor digital down conversion system, the system includes a signal conditioning module, the IF sampling function module, digital down conversion function modules and baseband signal processing function modules. Work requirements for the system, focusing on analysis method of digital frequency conversion technology in the design of key parameters, and gives the design of a dedicated chip GC5016 use in radar signal processing extension configuration parameters. The use of the design program, design and complete the the digital downconversion signal processing extension. Signal processing extension order to verify the performance of the system, the performance of the tests, including frequency detection, synchronization analysis test, amplitude and phase consistency analysis testing and signal-to-noise ratio analysis test. The test results showed that the completion of the next signal of the digital signal processor that can be preferably designed in this paper conversion processing, and the the IQ channel having a good amplitude and phase coherence, has a high output SNR.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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