Semi-sequential transmission method and system using simultaneou

Details Semi-sequential transmission method and system using simultaneou Semi-sequential transmission method and system using simultaneou

1989-02-21

1990-03-13

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

455 56, G01V 122

Patent

active

049088033

ABSTRACT:
A semi-sequential transmission method and system are provided making it possible for successive groups of seismic acquisition apparatus to communicate simultaneously, using several transmission frequencies, with a central seismic laboratory. Each of said apparatus comprises a frequency synthesizer capable, by means of switches, of setting itself to any one of different frequencies, and means for automatic distribution of the frequencies between the apparatus of the same group. Each of the apparatus, being given an order number dependent on its position along a seismic profile to be studied, determines the difference between its own order number and an order number which it receives by radio and which is that assigned to the first acquisition apparatus of its group. Depending on the difference measured and respecting certain limitations, each acquisition apparatus attributes to itself its own transmission frequency.

REFERENCES:
patent: 4042906 (1977-08-01), Ezell

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