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Research on Key Technology of Broadband Radar

Author: TianRui
Tutor: QiaoXiaoLin
School: Harbin Institute of Technology
Course: Signal and Information Processing
Keywords: Synthetic wideband radar HRRP Frequency step signal Inverse Discrete Fourier Transform Doppler effect
CLC: TN957.51
Type: Master's thesis
Year: 2008
Downloads: 28
Quote: 0
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Abstract


Synthetic wideband radar only to achieve a high range resolution , reducing the digital signal processing when the high speed requirements on the A / D conversion or the transmitter high power requirements , and in the work within the bandwidth of the frequency agile , so that against repressive interference , chaff , with the frequency of asynchronous interference , the answer jamming good results , and the source of interference is not easy to achieve the distance towing speed towing . Because of the advantages of this series , the large bandwidth signal required radiation missile-borne radar synthesis broadband technology to become mainstream technology . Wherein the stepped frequency signal for a typical synthesis of wideband signals . First, the article describes the design principles of the stepped frequency signal performance parameters and waveform parameters , calculation and analysis of the radar signal ambiguity function of frequency stepping , stepping frequency radar signal waveform analysis . Then a brief analysis of high-resolution imaging principle Stepped Frequency Radar . Due to the Doppler effect, distance makes the one-dimensional high-resolution image distortion . In this paper, for this case . Study several traditional speed compensation technology in order to obtain a high-precision HRRP , respectively analyzes each scope of the relationship between the parameters , precision and parameters , each algorithm simulation analysis of its anti- noise performance . And in accordance with the requirements of the project focus to research and select it . In - depth understanding of the algorithm on the basis of further proposed a new compensation algorithm based on two-step speed estimated speed . Abandoned before algorithm to the time-domain cross-correlation method in the optimization of the process mean speed rough estimation value , within a small range , the fine estimation of the minimum pulse group error method so that in order to consume coherent processing time is sacrificed to improve the velocity measurement accuracy method and instead propose a new adaptive search range . Simulation results show that the method not only meet the speed accuracy , and also greatly reduce the amount of computation . Finally, a new one-dimensional distance image correction technology (phase cancellation ) analysis , it is small in order to calculate the amount of anti-noise performance and a significant advantage , but changes in the relative velocity of a great influence on the effectiveness of the algorithm .

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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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