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Radar automatic target recognition based on feature extraction for complex HRRP

Science in China(Series F) 2008年第8期51卷 1138-1153页

作者： du lan liu hongwei bao zheng zhang junying National Laboratory of Radar Signal Processing Xidian University Xi'an 710071 China

Radar high-resolution range profile （HRRP） has received intensive attention from the radar automatic target recognition （RATR） community. Usually, since the initial phase of a complex HRRP is strongly sensitive to target position variation, which is referred to as the initial phase sensitivity in this paper, only the amplitude information in the complex HRRP, called the real HRRP in this paper, is used for RATR, whereas the phase information is discarded. However, the remaining phase information except for initial phases in the complex HRRP also contains valuable target discriminant information. This paper proposes a novel feature extraction method for the complex HRRP. The extracted complex feature vector, referred to as the complex feature vector with difference phases, contains the difference phase information between range cells but no initial phase information in the complex HRRR According to the scattering center model, the physical mechanism of the proposed complex feature vector is similar to that of the real HRRP, except for reserving some phase information independent of the initial phase in the complex HRRP. The recognition algorithms, frame-template establishment methods and preprocessing methods used in the real HRRP-based RATR can also be applied to the proposed complex feature vector-based RATR. Moreover, the components in the complex feature vector with difference phases approximate to follow Gaussian distribution, which make it simple to perform the statistical recognition by such complex feature vector. The recognition experiments based on measured data show that the proposed complex feature vector can obtain better recognition performance than the real HRRP if only the cell interval parameters are properly selected.

关键词： complex high-resolution range profile (HRRP) radar automatic target recognition (RATR) feature extraction minimum Euclidean distance classifier adaptive Gaussian classifier (AGC)

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A WEIGHTED FEATURE REduCTION METHOD FOR POWER SPECTRA OF RADAR HRRPS

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Journal of Electronics(China) 2006年第3期23卷 365-369页

作者： du lan liu hongwei bao zheng zhang junying National Laboratory of Radar Signal Processing Xidian University Xi＇an 710071 China

Feature reduction is a key process in pattern recognition. This paper deals with the feature reduction methods for a time-shift invariant feature, power spectrum, in Radar Automatic Target Recognition (RATR) using High-Resolution Range Profiles (HRRPs). Several existing feature reduction methods in pattern recognition are analyzed, and a weighted feature reduction method based on Fisher's Discriminant Ratio (FDR) is proposed in this paper. According to the characteristics of radar HRRP target recognition, this proposed method searches the optimal weight vector for power spectra of HRRPs by means of an iterative algorithm, and thus reduces feature dimensionality. Compared with the method of using raw power spectra and some existing feature reduction methods, the weighted feature reduction method can not only reduce feature dimensionality, but also improve recognition performance with low computation complexity. In the recognition experiments based on measured data, the proposed method is robust to different test data and achieves good recognition results.

关键词： Radar Automatic Target Recognition (RATR) High-Resolution Range Profile (HRRP) Power spectrum Feature reduction Fisher's Discriminant Ratio (FDR)

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