Volume 34 Issue 2
Mar.  2014
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Wang Shun, Chen Ziwei, Zhang Feng, Gong Zhaoqian, Fang Guangyou, Wang Yungang. A method for separating O wave and X wave in digital ionosonde[J]. Journal of Space Science, 2014, 34(2): 186-193. doi: 10.11728/cjss2014.02.186
Citation: Wang Shun, Chen Ziwei, Zhang Feng, Gong Zhaoqian, Fang Guangyou, Wang Yungang. A method for separating O wave and X wave in digital ionosonde[J]. Journal of Space Science, 2014, 34(2): 186-193. doi: 10.11728/cjss2014.02.186

A method for separating O wave and X wave in digital ionosonde

doi: 10.11728/cjss2014.02.186
  • Received Date: 2013-03-26
  • Rev Recd Date: 2013-10-12
  • Publish Date: 2014-03-15
  • Separation for O wave and X wave is an important job in ionosphere detection. A new digital method for separating O wave and X wave is presented in this paper, being different from using image recognition technique to separate trace O and trace X in ionograms or electrical method to synthesize circularly polarized signals to separate O wave and X wave from echoes of the ionosphere. A numerical synthesizing method is employed in the new method. By introducing phase shifters of ±90° in digital domain, circularly polarized signals are synthesized digitally within the range of 1~ 30MHz, which eliminates the nonlinearity and expands the bandwidth of the ionosonde compared with DPS-4, and there is no need to switch the analog switches continuously. The new method has been successfully applied to CAS-DIS ionosonde and testing results show that the new digital method is capable of separating O wave and X wave well.

     

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