DocumentCode :
26439
Title :
Suppression of Cross-Channel Interference Based on the Fractional Fourier Transform in Polarimetric Radar
Author :
Mi He ; Yongjian Nian ; Yongzhen Li ; Shunping Xiao ; Zhihui Liu
Author_Institution :
Sch. of Biomed. Eng., Third Mil. Med. Univ., Chongqing, China
Volume :
10
Issue :
6
fYear :
2013
fDate :
Nov. 2013
Firstpage :
1473
Lastpage :
1477
Abstract :
A new cross-channel interference suppression method based on the fractional Fourier transform (FRFT) is proposed to eliminate the effect due to cross-channel interference when a full-polarimetric radar adopts the opposite-slope linear frequency modulation transmit signals and de-ramping processing in the simultaneous measurement mode. The FRFT with an appropriate order is operated on the signals in the cross-interference interval. Such order is obtained via the calculation of the frequency-modulation slope of transmitted signals. The cross-channel interference is changed into sinc functions that are detected by a designed threshold and filtered out in the FRFT domain to suppress the cross-channel interference. The simulations show that the proposed method can obviously reduce the peak sidelobe levels and the integrated sidelobe levels of targets in range profiles compared with the traditional method, which is benefit to improve the detection and measurement performances of weak polarimetric scattering components. The proposed method is suitable for stable or slow-moving targets.
Keywords :
Fourier transforms; frequency modulation; interference suppression; radar interference; radar polarimetry; radar signal processing; remote sensing by radar; FRFT domain; cross-channel interference suppression method; cross-interference interval; de-ramping processing; fractional Fourier transform; frequency-modulation slope calculation; full-polarimetric radar; integrated sidelobe levels; opposite-slope linear frequency modulation; peak sidelobe level reduction; range profile targets; signal transmission; simultaneous measurement mode; sinc functions; slow-moving target; stable target; traditional method; weak polarimetric scattering component detection performance; weak polarimetric scattering component measurement performance; Fourier transforms; Interference; Noise; Radar measurements; Radar polarimetry; Radar signal processing; Cross-channel interference suppression; fractional Fourier transform (FRFT); radar polarimetry; simultaneous measurement;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
Publisher :
ieee
ISSN :
1545-598X
Type :
jour
DOI :
10.1109/LGRS.2013.2260525
Filename :
6553577
Link To Document :
بازگشت