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Research on the Key Technique of Ultrawideband Radar

Author: LiHaiTao
Tutor: XuJiZuo
School: University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: Ultra-wideband radar Goal modeling High range resolution Signal processing Frequency step Wavelet Transform Target detection Radar Equation RF interference suppression Wideband digital receiver Ultra-wideband communications
CLC: TN951
Type: PhD thesis
Year: 2000
Downloads: 2039
Quote: 25
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Abstract


Ultra-wideband (UWB) radar is a new radar system, it's very wide signal bandwidth, high range resolution (HRR) radar detection, imaging, precise positioning, target recognition technology has been widely applied. In this paper, ultra-wideband technology for clues around ultra-wideband radar research areas of some of the key technologies, such as goal modeling, signal processing, receiver design, as well as ultra-wideband signals in communication applications to commence the study achieved the outcome of the application value. 1. Establish a complete ultra-wideband radar echo model type and the echo signal simulation. Imperfect modeling for UWB radar target echo modeling of UWB radar. In the the UWB signals irradiation, the scattering intensity and frequency of the different types of scattering centers related target impulse response in the time domain, in addition to performance shock pulse, there are other functional form. UWB radar model type promotion literature, get the general expression of the model, the model-type fully reflect the characteristics of ultra-wideband radar scattering. On this basis, the target echo UWB chirp signal simulation. Get early response echoes. Approximate description of the mathematical literature on the impact of the UWB radar target response, the distribution of the set of conditions in the target scattering centers, linear FM, the target echo Modeling phase encoding and the shock pulse three types of commonly used ultra-wideband radar signal. 2. Derivation the surplus broadband radar equation and study the different signal processing on the signal resolution. These two aspects are related to the performance of the UWB radar system. Radar range and radar equation is closely related to each component such as UWB radar equation the antenna directivity factor, the goal of effective scattering area and receiving antenna effective area and so are a function of frequency, narrow-band radar equation UWB radar is no longer applicable, this article from equation of surplus wideband radar theoretically. From the signal bandwidth perspective, the same bandwidth, time domain, frequency domain, the ultra-wideband signal having the same distance resolution. However, due to the different signal processing method, the actual resolving power of the obtained target is not the same. The results show that the time domain signal obtained by direct sampling processing surrounding strength target resolution than the pulse pressure signal correlation processing higher. The work of these two aspects of UWB radar theory more perfect. 3. Ultra-wideband radar signal processing technology, the following research work. The ultra-wideband frequency step signal is a research hotspot in recent years, this paper first analyzes the rectangular, linear frequency modulation (LFM) imaging characteristics of the sub-pulse frequency step signal composed works, still and movement. Then, based on one-dimensional the stepping frequency radar target distance output as a target detection method, the method outperforms traditional detection techniques, and the method can be extended to one-dimensional distance of any high-resolution radar images target detection. The rise in recent years, high-resolution wavelet transform with time-frequency characteristics, very suitable for processing nonstationary ultra-wideband radar target echo. UWB radar signal processing research, the rationale Chinese milk analysis shows that the equivalent of the broadband signal processing based on the time scales of the wavelet domain matched filtering: thus, the proposed use of the continuous wavelet transform from the target in the distance like to be on the extract scattering centers, it is superior to the traditional Fourier transform method. Finally, the study of a UWB radar, radio interference suppression problem proposed based on the LMS adaptive interference suppression method, the method has the advantages of a simple, efficient. 4. The ultra-wideband radar digital receiver experimental prototype RF front-end development work. Wide signal bandwidth and performance limitations of high-speed devices, broadband digital receiver development work faces some challenges. Developed by proposing a reasonable system design to solve the practical problems encountered in the experiment, the receiver front-end, it is successfully used for ultra-wideband radar receiver in the experimental system. Analyzed theoretically produce analog I / Q down-conversion receiver channel amplitude and phase errors, amplitude and phase error correction scheme applies to a broadband receiver receiver 1, Q channel imbalance. 5. Ultra-wideband signals in wireless communication applications. By analyzing the UWB signal the principle of time-hopping spread-spectrum multiple access communication research UWB communication signal processing, as well as the performance of these two aspects of the system bit error rate and channel capacity analysis, simulation proved in dense multipath the feasibility of achieving ultra-wideband communications environment.

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