Study on ionospheric plasma drift measurement technology

The ionospheric plasma drift measurement technique based on the vertical detection of the phased array ionosphere is improved to address the problems of phase ambiguity and directional errors caused by short-wave interference in the interferometer directional measurement in the plasma drift measurement technique. The beamforming direction finding method is used to determine the azimuth and zenith angle of the maximum peak signal, which is the actual direction of the incoming signal, to improve the robustness of the echo direction measurement. The time interpolation technique is used to increase the number of fixed frequency detection frequencies while shortening the fixed frequency detection time to increase the number of effective plasma reflection echoes. For the same frequency interference and "strip" interference, the interference avoidance technology is used to ensure that the disturbed signal does not participate in the subsequent directional processing, while the Doppler domain energy curve is used to determine the height range of the effective echoes and improve the accuracy of the plasma echo velocity estimation. The comparison with the measured results of DPS-4D ionosonde in Hainan verifies the progressiveness of the proposed method.