Ionosonde
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United States of America Patent
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Nov 23, 2004
Grant Date -
Apr 24, 2003
app pub date -
Oct 22, 2002
filing date -
Oct 22, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ionosonde includes a signal-transmitting section for transmitting to an ionosphere pulsed radio waves whose frequency is scanned; a signal-receiving section that includes a loop antenna system for measuring intensity of a magnetic field Hz of pulsed radio waves reflected by the ionosphere, a first dipole antenna system for measuring intensity of an electric field Ex orthogonal to the magnetic field Hz and a second dipole antenna system for measuring intensity of an electric field Ey orthogonal to the magnetic field Hz and electric field Ex; and a signal-processing section using values obtained at the signal-receiving section to obtain a cosine (n.sub.x, n.sub.y) of an arrival direction n of the reflected radio waves in accordance with relationship n.sub.x =(HzNx*-ExHz*)Z/(ExEy*-EyEx*) and relationship n.sub.y =(HzEy*-EyHz*)Z/(ExEy*-EyEx*), wherein Z stands for intrinsic impedance.
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