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The Study of Moving Target Detection of Human on UWB Through-the-wall Radar

Author: LiPengFei
Tutor: ZhuGuoFu
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: UWB TWR moving target detection of human clutter suppression RFI suppression
CLC: TN957.51
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 1
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Abstract


As an emerging field of study, UWB TWR has attracted more and more attention. Because it could penetrate wall or other media to detect target behind the wall, UWB TWR could be widely used both in military and civilian areas. This paper deep analyzes several problems in detecting through the wall via the study of moving target detection of human on UWB TWR.First, this paper introduces the situation of study of UWB TWR at home and abroad. Two existing UWB TWR systems are concretely introduced. Then the main problems in detecting through the wall are proposed, and the main work of this paper is specified.As for signal dispersion result form UWB antenna, this paper analyses concrete cause of UWB antenna dispersion. Antenna dispersion causes the echoes broadening, energy dispersion, extremely detrimental to target detection. As for dispersion compensation data, we use a new test method that could accurately determine the validityAs for clutter interference in detecting through the wall, this paper analyses main components of the background clutter. For the relatively static characteristics of the background clutter, we establish the Gaussian probability distribution model. Then we study the advantages and disadvantages of different typical clutter suppression algorithm, and indicate the relationship between the target motion states with the performance of clutter suppression to determine the use environment of different clutter suppression algorithm. As for target detection, this paper proposes a recursive formula for the threshold update. The new formula combines threshold calculation with background subtraction, greatly reducing the computation of threshold calculation, and make a real-time threshold calculation.As for RFI in detecting through the wall, this paper analyses and indicates that for detecting through the wall or other close range detecting RFI mainly represent as the second class of unknown time-variable RFI. Through the study the effect of RFI to echoes, we indicate its representation in the time domain and frequency domain. We analyses the advantage and disadvantage of the general algorithm. For time-frequency characteristic of RFI, a new RFI suppression algorithm with adaptive selection is proposed, and its validity is certified by experimental data.

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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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