Method and apparatus for calibrating the ionosphere and applicat

Details Method and apparatus for calibrating the ionosphere and applicat Method and apparatus for calibrating the ionosphere and applicat

1981-11-17

1984-07-31

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343352, 343 5W, G01S 302

Patent

active

044633572

ABSTRACT:
The columnar electron content of the ionosphere between a spacecraft (10) and a receiver (12, 14) is measured in realtime by cross correlating two coherently modulated signals transmitted at different frequencies (L.sub.1, L.sub.2) from the spacecraft to the receiver using a cross correlator (16). The time difference of arrival of the modulated signals is proportional to electron content of the ionosphere. A variable delay (21) is adjusted relative to a fixed delay (20) in the respective channels (L.sub.1, L.sub.2) to produce a maximum at the cross correlator output. The difference in delay required to produce this maximum is a measure of the columnar electron content of the ionosphere. A plurality of monitoring stations (31, 32, 33) and spacecrafts (GPS satellites 34, 35, 36) are employed to locate any terrestrial event that produces an ionospheric disturbance.

REFERENCES:
patent: 3727225 (1973-04-01), Adrian
patent: 3881154 (1975-04-01), Lewis et al.
patent: 3987445 (1976-10-01), Fales
Koehler, Radio Propagation Measurements of Pulsed Plasma Streams from the Sun Using Pioneer Spacecraft, J. Geophysical Research, Space Physics, vol. 73, No. 15, Aug. 1, 1968, pp. 4883-4894.

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