E-Spectrum Announces the Development of a Novel New Ultra-Low Frequency
Electro-Magnetic (ULF EM) Telemetry Receiver
San Antonio, TX · August 6, 2004 · E-Spectrum Technologies has developed a novel new ultra-low frequency electro-magnetic (ULF EM) telemetry receiver. This unique receiver is designed primarily for usage in recovering borehole telemetry signals within an energy exploration related drilling-rig environment and is specifically designed to facilitate such operations as measurement-while-drilling (MWD) or wireless well logging.
The new receiver is designed specifically for operation in a high-electromagnetic noise environment and employs a unique multiple-input, time-domain synthesis, data-fusion methodology for the detection and reconstruction of an arriving uplink transmission originating from a downhole tool.
This innovative receiver works by fusing multiple receive input sources to synthesize a decodable message packet from a noise corrupted telemetry message string. The receiver fuses the incoming EM-wave information, gathered from multiple receive inputs, into a multi-sensor observation set and then utilizes a suite of decision metrics to reconstruct the original, non noise-corrupted message from the observation set via the estimation of certain key signal characteristics.
Unlike other "state-of-the-art" multi-channel receivers, the new E-Spectrum data-fusion receiver does not rely on the direct real-time combinatorial manipulation of the raw carrier signal waveforms nor does it require the receive algorithms to discriminate between "noise" or "signal" channels. E-Spectrums usage of non-combinatorial algorithms which do not discriminate between the specific noise/signal characteristics of incoming receive channels provides a more robust and scalable noise rejection solution for ULF EM receive applications.
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