An improved time-frequency distribution method for ionosphere phase decontamination

ISAPE2012 ◽  
2012 ◽  
Author(s):  
Xue Li ◽  
Zhuan Xia Lu ◽  
Wen Ling Guo
Keyword(s):  
Frequency Distribution ◽  
Distribution Method ◽  
Time Frequency ◽  
Time Frequency Distribution

scholarly journals A Cascaded Approach for Correcting Ionospheric Contamination with Large Amplitude in HF Skywave Radars

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Yajun Li ◽  
Yinsheng Wei ◽  
Rujiang Guo ◽  
Rongqing Xu ◽  
Zhuoqun Wang ◽  
...  
Keyword(s):  
Frequency Distribution ◽  
Large Amplitude ◽  
Gradient Algorithm ◽  
Frequency Resolution ◽  
Good Effect ◽  
Distribution Method ◽  
Phase Gradient ◽  
Time Frequency ◽  
Phase Perturbation ◽  
Time Frequency Distribution

Ionospheric phase perturbation with large amplitude causes broadening sea clutter’s Bragg peaks to overlap each other; the performance of traditional decontamination methods about filtering Bragg peak is poor, which greatly limits the detection performance of HF skywave radars. In view of the ionospheric phase perturbation with large amplitude, this paper proposes a cascaded approach based on improved S-method to correct the ionospheric phase contamination. This approach consists of two correction steps. At the first step, a time-frequency distribution method based on improved S-method is adopted and an optimal detection method is designed to obtain a coarse ionospheric modulation estimation from the time-frequency distribution. At the second correction step, based on the phase gradient algorithm (PGA) is exploited to eliminate the residual contamination. Finally, use the measured data to verify the effectiveness of the method. Simulation results show the time-frequency resolution of this method is high and is not affected by the interference of the cross term; ionospheric phase perturbation with large amplitude can be corrected in low signal-to-noise (SNR); such a cascade correction method has a good effect.

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