| Radar target identification(RTI)is an important developing field of modern radar technology. Modern radar technology become mature day by day makes it possible to develop a practical RTI system. In this paper, the problem of recognition of radar target using High Resolution Range Profiles(HRRP) is mainly studied by the means of techniques in modern signal process and in modern pattern recognition. Because High Resolution Range Profile can provide more accurate target structure and shape information,research on RTI based on one-dimensional range profile is significance for both theory and practice. In this thesis, its content and originality are synthesized as follows:First, the basic concepts of radar target recognition and the basic method of recognition of range profiles are surveied. The status quo of radar target identification is analyzed. The paper introduce the concept of radar target cross section and broadband target RCS characteristics, RCS pre-estimating method. The concept of multi-target scattering center and Range profile model are bewrited. The characteristics of typical aircraft electromagnetic scattering that vary with aspect are analyzed deeply. In particular , the principle and simulation method of High Hesolution Range Profiles is studied. After the mathematical model of the Range Profile features which is based on the multi-scattering Center, analysis have been made on echo characteristics of a single range profile and cross-range profile. Research has also been made on key techniques of recognition of one-dimensional range profile in which aspect sensitivity,translation sensitivity and amplitude sensitivity should deal with pretreatment.Studying of linear frequency modulation, step frequency, no-load binary phase coded ultra-wideband radar imaging algorithm based on . Analysis of the echo characteristics of multi-objective and multi-scattering centers are distributed one-dimensional range profile.Under the wide-band digital pulse compression of linear frequency modulation (LFM) signal both for receiving and transmitting, the target recognition problem forming the one-dimension range profile in high-resolution radar stretch processing range is analyzed. The radar-echo model for multi-target of wideband linear frequency modulated signal Stretch processing is derived, and the multi-target identification according to one-dimension range profile is analyzed. The received pulse width expanding and center frequency shifting due to range-doppler coupling of moving target are discussed, and a radial velocity compensation method is proposed.Secondly, this paper firstly introduces the mathematical model of stepped frequency and one dimensional range imaging technique. The mathematical model of one dimensional range imaging for high range resolution radar target when there is relative motion between the radar and the target is given. Using this mathematical model, the influence of target relative motion on one dimensional range imaging is investigated by computer simulation.Finally, the value of the compensation error of this relative motion between the radar and the target is derived. when one dimensional range imaging technique is used for target identification. By comparison with two kinds of radar systems, the received pulse width expanding and center frequency shifting due to range-doppler coupling, the impact of the doppler effect on the stepped frequency and linear frequency from one-dimensional range profile of moving target are discussed,in which analyze of velocity estimation and compensation methods . Computer simulation shows that the method of speed estimation and compensation has been validated。In the paper, a method is presented which gets radar target high dimensional structure information from one dimensional range Profiles based on pattern-matching recognition. When doing dimension reduction of the Range Profile features, two kinds of common linear data dimensional reduction methods is principle component analysis and canonical component analysis would contributed greatly to it.In conclusion, the main works of the dissertation are summarized and the future research areas are pointed out. |
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