An FSK telemetry module for vector measuring current meters
Fucile, Paul D.
Valdes, James R.
MetadataShow full item record
The EG&G Vector Measuring Current Meter (VMCM) used in mooring work provides a 20 ma Serial ASCII Instrumentation Loop (SAIL) communication system. A projected application of the VMCM is to have a surface mooring communicate with a series of VMCMs via a Frequency Shift Keying (FSK) link. While an FSK modem can communicate with the VMCM. a problem exists with the general operation of the VMCM. If the VMCM is addressed to dump data; it remains on until the unit is re-addressed. If a failure in the link occurs. then the VMCM stays on in . a higher power mode and the batteries will be depleted early. The insertion of a processing block between the modem the VMCM provides a way to look at incoming data. qualify it re-transmit it to the VMCM. The VMCM will reply and preprocessor can channel the data to the modem. In the event VMCM malfunction. the preprocessor has a timeout function will turn off the carrier keeping the line quiet.
Showing items related by title, author, creator and subject.
Thwaites, Fredrik T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-09)This thesis describes the analysis and development of an acoustic vorticity meter to measure shear in ocean-boundary layers over smaller measurement volumes than previously possible. A nonintrusive measurement of vorticity ...
McCullough, James R.; Tupper, George H. (Woods Hole Oceanographic Institution, 1969-03)This report describes work done with Geodyne current meters and wind recorders during 1968. Techniques for testing instruments prior to use at sea, instrument performance at sea and instrument changes evolved during the ...
Blumenthal, Martin Benno (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-01)Garrett and Munk use linear dynamics to synthesize frequency-wavenumber energy spectra for internal waves (GM72, GM75, GM79). The GM internal wave models are horizontally isotropic, vertically symmetric, purely propagating, ...