PROJECTOR ON-LINE MONITORING SYSTEMS (PROMS) DESIGN REPORT

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Authors
  1. Watson, D.
  2. Zelmer, W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Omnitech Electronics Inc, Dartmouth NS (CAN)
Abstract
The report details the design and construction of two Projector On-line Monitoring Systems (PROMS). Each system consists of a ship mounted receiver unit and a submersible sensor package that will be mounted on an acoustic projector tow body. The data from the submersible sensors unit must be transmitted on the same cable as the 2700 volt power that is being delivered to the projectors. This creates an electrically hazardous environment that has been overcome through the use of filters that include saturable core inductors. The sensor package measures pitch, roll, depth, sea temperature and tri-axial acceleration of the projector body. The data is digitized, formatted into packets then transmitted to the surface using high frequency FSK. The FSK signal is modulated onto the 120V, 60 cycle power signal that is transmitted from the surface to power the sensor package. The receiver unit in the tow ship decodes the data and provides output in three forms: a) visual display on an 80 character LCD; b) 7 channels of reconstructed analog signals; c) scaled RS-232 output. A 16 button keyboard on the receiver allows the user to select display modes and sensor calibration coefficients.
Keywords
PROMS (Projector On-Line Monitoring System);Submersible Sensor Package;Destructive interference;Signal- induced transients;Cable leakage characteristics;Tri-axial acceleration measurement
Report Number
DREA-CR-96-430 — Contractor Report
Date of publication
01 Mar 1996
Number of Pages
170
DSTKIM No
97-02669
CANDIS No
502896
Format(s):
Hardcopy;Document Image stored on Optical Disk

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