Title :
Power line detection from synthetic aperture radar imagery using coherence of co-polarisation and cross-polarisation estimated in the hough domain
Author :
Deng, Shaozhi ; Li, Peng ; Zhang, Juyong ; Yang, Jian
Author_Institution :
State Key Lab. for Inf. Eng. in Surveying, Mapping & Remote Sensing, Wuhan Univ., Wuhan, China
fDate :
12/1/2012 12:00:00 AM
Abstract :
Power lines are an important target type in topographic mapping, as well as in post-disaster and post-strike damage detection. A method of detecting power lines from polarimetric synthetic aperture radar (POLSAR) data using the coherence between the co- and cross-polarisation is proposed based on the azimuth symmetry of the clutter. First, the scattering of power lines is analysed from the aspects of radar cross-section and polarimetric response. Next, the covariance and coherence between the co- and cross-polarisation of power lines and clutter are characterised, and a constant false-alarm rate detector based on the coherence statistics is proposed. In order to obtain a high accuracy, the coherence is estimated in the Hough domain, and the proposed method is improved by considering the sign of the polarimetric orientation angle and using only the real part of the coherence. In addition, the coherence in the special case of azimuth symmetrical power lines is estimated using rotated scattering matrix. Finally, the proposed detector is demonstrated using both simulated and real P-band POLSAR data.
Keywords :
Hough transforms; S-matrix theory; electromagnetic wave polarisation; power cables; radar clutter; radar cross-sections; radar detection; radar imaging; radar polarimetry; synthetic aperture radar; Hough transform domain; P-band POLSAR data; azimuth symmetrical power lines; clutter; coherence statistics; constant false-alarm rate detector; copolarisation coherence; cross-polarisation coherence; polarimetric orientation angle; polarimetric response; polarimetric synthetic aperture radar data; post-disaster; post-strike damage detection; power line detection; power line scattering; radar cross-section; rotated scattering matrix; synthetic aperture radar imagery; topographic mapping;
Journal_Title :
Radar, Sonar & Navigation, IET
DOI :
10.1049/iet-rsn.2011.0332