Radio frequency seismic gathering system employing an airborne b

Details Radio frequency seismic gathering system employing an airborne b Radio frequency seismic gathering system employing an airborne b

1979-07-25

1980-11-25

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 14, 343706, 455 97, G01V 122

Patent

active

042362342

ABSTRACT:
The central station of a radio-connected seismic surveying system uses a tethered blimp carrying an antenna and an electronics package including a dc voltage/rf decoupler, a variable dc controlled preamplifier, a P-I-N diode switch for changing the antenna from receive to transmit operation, a transmitter and modulator and a battery. An rf coaxial cable to ground provides means for controlling the preamplifier gain and for switching the central station to the transmit mode by using appropriate dc signals. In the receive mode, the cable carries detected field unit seismic signals, which are detected by the blimp-carried antenna and preamplified by the blimp preamplifier, to the ground for suitable recording and further processing in the ground portion of the central station. An audio channel can also be modulated onto the transmit carrier of approximately 70 MHz to provide voice communications via the blimp electronics, if desired. Both the ground portion and the blimp portion of the central station are packaged for helicopter transporting.

REFERENCES:
patent: 465971 (1891-12-01), Edison
patent: 651361 (1900-06-01), Kitsee
patent: 1375675 (1921-04-01), Colpitts
patent: 1492300 (1924-04-01), Lawy
patent: 3030500 (1962-04-01), Katzen
patent: 3062315 (1962-11-01), Herzok
patent: 3514749 (1976-05-01), Padberg
patent: 3555502 (1971-01-01), Davis et al.
patent: 3979753 (1976-09-01), Underwood
patent: 4016951 (1977-04-01), Dick et al.
Fleming, "Skyhooks for Antenna", Jul. 1, 1976, Telephone Engineer & Management, vol. 80, #13, pp. 42-43.

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