Target Detection beneath Canopy Using PolSAR Images
Polarization information is applied to detect target underneath forest by synthetic aperture imaging. At first, hard-in-loop PolSAR system is constructed in an anechoic chamber, then the resolution and sampling interval of system are analyzed. In order to obtain accurate polarization data, polarization scattering matrix measurement and calibration method are used. The data of echoes are processed by an improved back-projection algorithm. After comparing the difference of images, target beneath canopy is detected according to the best combination polarization information. In the experiment, a PNA transmits two signals by wide-band anten-nas, and another two antennas receive returned signals coming back to the PNA. The antennas maintain downward at an incident angle of 20 degrees with ground. The area of scene is 1m2, which consists of three fir trees and a scaled tank. The height of trees is about 1meter, and the scaled tank is located beneath trees. The frequency is working at L-band, and the frequency sampling interval is 12.5 MHz. Scanner moves 3 meters along the center of scene, and the spatial sampling interval is 1.5 cm. The resolutions of cross-range and ground-range are 0.17m and 0.15m respectively. The results show that HH polarization image has a good effect for target detection beneath canopy at L-band.
C.F.Hu J.D.Xu N.J.Li L.X.Zhang
Electronic Engineering Department,Northwestern Polytechnic University,China;National Key Laboratory Electronic Engineering Department,Northwestern Polytechnic University,China National Key Laboratory of UAV Specialty Technique Northwestern Polytechnic University,China
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
1216-1219
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）