Paper Info
Title
Regularized 2-D complex-log spectral analysis and subspace reliability analysis of micro-Doppler signature for UAV detection.
Abstract
The proposed 2-D regularized complex-log-Fourier transform better represents mDS.The proposed subspace reliability analysis better removes unreliable dimensions.The proposed approach demonstrates superior performance for UAV detection. Unmanned aerial vehicle (UAV) has become an important radar target recently because of its wide applications and potential security threats. Traditionally, visual features such as spectrogram were often extracted for human operators to identify the micro-Doppler signature (mDS) of UAVs, i.e. sinusoidal modulation. In this paper, the authors aim to design a system for machine automatic classification of UAVs from other targets, particularly from birds as both UAVs and birds are small and slow-moving radar targets. Most existing mDS representations such as spectrogram, cepstrogram and cadence velocity diagram discard the phase spectrum, and only make use of the magnitude spectrum. Whats more, people often take the logarithm of the spectrum to enlarge the weak mDS but without sufficient care, as noise may be enlarged at the same time. The authors thus propose a regularized 2-D complex-log-Fourier transform to address these problems. Furthermore, the authors propose an object-oriented dimension-reduction technique: subspace reliability analysis, which directly removes the unreliable feature dimensions of two class-conditional covariance matrices in two separate subspaces. On the benchmark dataset, the proposed approach demonstrates better performance than the state-of-the-art approaches. More specifically, the proposed approach significantly reduces the equal error rate of the second best approach, cadence velocity diagram, from 6.68% to 3.27%.
Year
DOI
Venue
2017
10.1016/j.patcog.2017.04.024
Pattern Recognition
Keywords
Field
DocType
UAV detection,Radar,Micro-Doppler signature,2-D regularized complex-log-Fourier transform,Subspace reliability analysis
Radar,Complex logarithm,Subspace topology,Pattern recognition,Spectrogram,Word error rate,Linear subspace,Artificial intelligence,Logarithm,Machine learning,Mathematics,Covariance
Journal
Volume
Issue
ISSN
69
C
0031-3203
Citations 
PageRank 
References 
1
0.35
30
Authors
2
Name
Order
Citations
PageRank
Jianfeng Ren129116.97
Xudong Jiang21885117.85