Teledyne PATHFINDER - Page 4

Page iv
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Beam Clearance ................................................................................................................................... 37
Mounting the Instrument ..................................................................................................................... 37
Pitch & Roll ........................................................................................................................................... 37
Routing Cables...................................................................................................................................... 38
Electrical Integration Considerations ........................................................................................................... 39
Grounding Issues .................................................................................................................................. 39
Electrical and Grounding Testing Best Practices .................................................................................. 40
Electro-Magnetic Interference (EMI) ................................................................................................... 41
EMI Coupling Through Cables .............................................................................................................. 41
Power Consumption ............................................................................................................................. 42
Inrush Currents..................................................................................................................................... 42
Acoustic Integration Considerations ............................................................................................................ 43
Flow Noise ............................................................................................................................................ 43
Cavitation ............................................................................................................................................. 43
Ringing.................................................................................................................................................. 43
Mounting Considerations ..................................................................................................................... 44
Windows Use Considerations ............................................................................................................... 44
Recommended Practices for Window Use ..................................................................................... 45
SONAR Interference Considerations .................................................................................................... 46
Interference Detection and Mitigation ................................................................................................ 46
Reference, Data & Timing Considerations ................................................................................................... 47
Coordinate Frames ............................................................................................................................... 47
Data Screening ..................................................................................................................................... 47
Three-Beam Solution............................................................................................................................ 48
Ping Timing ........................................................................................................................................... 48
System Synchronization ....................................................................................................................... 49
Operational and Setup Considerations ........................................................................................................ 49
Unfavorable Environments .................................................................................................................. 49
Triggering ............................................................................................................................................. 50
Design Considerations & Bench Test .................................................................................................... 50
Troubleshooting ........................................................................................................................................... 51
Communications Issues ........................................................................................................................ 51
Initial Shakedown Deployment .................................................................................................................... 51
Troubleshooting Checklist .................................................................................................................... 51
Identify Unit ................................................................................................................................... 51
Run Built-In Tests ........................................................................................................................... 51
Provide Unit Setup ......................................................................................................................... 52
Describe Deployment Environment & Operational Conditions ..................................................... 53
Describe the System Installation .................................................................................................... 53
Provide Raw Data & Describe Issue for Analysis by TRDI ............................................................... 53
Provide Additional Data for Analysis by TRDI ................................................................................ 53
Record Engineering Data for Analysis by TRDI ............................................................................... 53
Identifying EMI ............................................................................................................................................. 55
Purpose ................................................................................................................................................ 55
Adjustments ......................................................................................................................................... 55
Operation ............................................................................................................................................. 55
Install the NGSPFFT Software ........................................................................................................ 56
Connecting to the Pathfinder DVL ................................................................................................. 56
Check the Adjustments .................................................................................................................. 57
Zoom .............................................................................................................................................. 57
Mouse-Over: .................................................................................................................................. 57
Examples of Clean FFT Plots, No Interference ...................................................................................... 57
Examples of Interference ..................................................................................................................... 58
Alternative FFT Tool for Virtual Comports ........................................................................................... 60
Matlab Output Variable Definitions ............................................................................................................. 61
CHAPTER 3 – COLLECTING DATA ............................................................................................................................63
Pathfinder General Deployment Flow .......................................................................................................... 64