Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent
1979-05-09
1981-11-24
Birmiel, Howard A.
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
340857, 455 40, 455 41, 370 21, 375 6, 375 24, 375 39, G01V 140
Patent
active
043027571
ABSTRACT:
Apparatus and method for signaling within a drill hole without disturbing an ongoing drilling operation. High data rates are achieved by using phase and/or amplitude modulation techniques which enable information transfer rates well in excess of the data bit rates being transmitted. The modulation technique provides a multi-level signal which makes optimum use of the amplitude/phase space available. The ability of the invention to substantially increase the carrying capacity of the communication channel is based upon the dispersive characteristics of electromagnetic propagation in a bore hole, wherein the lower frequencies propagate at a slower velocity, and with less attenuation than the higher frequencies. The relative effects of losses over the path length and the added signal-to-noise ratio required for the modulation techniques disclosed in this invention are balanced against each other in such a manner that data rates otherwise achievable only at higher frequencies can be obtained at lower frequencies with a net increase in usable path lengths for equivalent available signal powers and data rates. In accordance with this invention the number of signal states, e.g. phase levels and amplitude levels, for a given signal frequency are selected so as to maximize either the signal path length for a given carrying capacity of the signal channel, or the carrying capacity of the channel for a given path length.
REFERENCES:
patent: 3079549 (1963-02-01), Martin
patent: 3588702 (1971-06-01), Tisi et al.
patent: 3967201 (1976-06-01), Rorden
patent: 4057781 (1977-11-01), Scherbatskoy
patent: 4087781 (1978-05-01), Grossi et al.
patent: 4123710 (1978-10-01), Stuart et al.
Aerospace Industrial Associates, Inc.
Birmiel Howard A.
Nixon Larry S.
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