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ROV Locator
ROV Locator
  • ROV Locator
  • Overview
  • General Specifications Mk II
  • General Specifications Mk III
  • System Variants
  • Fundamentals Useful to System Designers
    • Sound Reflection and Absorption
    • Multipath
    • Ping Length
    • What to Do About Multipath and Other Issues
    • Clock Drift Expectations
    • Accuracy Expectations
      • Accuracy Test: Topside GPS
      • Accuracy Test: 110 Meter Slant Range
      • Accuracy Test: 295 Meter Slant Range
    • Operation in a Pool
  • Autosync Option (Mk II Only)
    • Autosync Mission Scenarios and Mission Suitability
    • Autosync Availability
    • Autosync GPS/GNSS Output
  • ROVL Channels (Autosync only; Operating Multiple Units in Proximity)
  • ROVL Coordinate Systems and Angles
    • Definitions
    • NED or “Compass” vs. ENU or “Math” Angles
    • Math to Compass Frame Conversions
    • Transducer Down Orientation
    • Transducer Up Orientation
    • Receiver/Transceiver Orientation Frames
    • Best Operating Envelope
  • Communicating With the ROVL
    • Serial Parameters
    • Packet Format
    • Messages from ROVL to Host
      • $USRTH Receiver-Transmitter Relative Angles Message
      • $USINF Information Message
      • $USERR Error Message
    • Messages from Host to ROVL
      • NMEA-Format Messages to Receiver
      • Valid Commands from Host to ROVL
  • Inertial Measurement Unit (IMU)
    • How To Tell Which IMU is Active
    • Mk II IMU Modes and Calibration
      • Mk II IMU Calibration Background
      • Mk II IMU Calibration General Procedures
    • CIMU Calibration Background
      • CIMU Magnetometer Calibration
      • CIMU Accelerometer Calibration
      • CIMU Gyro Calibration
  • Operating and Accuracy Considerations
  • Multi-Unit Operation (Swarms)
    • Multi-Unit 1:1
    • Multi-Unit 1:2
    • Multi-Unit 2x1:1
    • Multi-Unit n:1 (fixed transmitter)
    • Multi-Unit n:1 (mobile transmitter)
  • ROVL Mounting and Wiring
    • ROV/Deepside Mounting
    • Topside Mounting
    • Simple Topside Deployment Fixture
    • Wiring Notes
    • Electrical Noise
    • USB Interface using Blue Robotics BLUART Board
  • Mechanical Drawings
    • Mounting Footprint and Envelope, "S" Package
    • Mounting Footprint ("P" Package Mk II and Mk III)
    • Envelope Drawing. "P" Package ROVL Mk II Transmitter and Receiver, Mk III Transponder
  • Appendix: Math for Computing Remote Latitude/Longitude
    • Receiver & GPS at Topside and Transmitter Deepside
    • Transmitter & GPS Topside and Receiver Deepside
  • Appendix: Factory Usage Command Set
  • Troubleshooting
    • How to Tell if Your Mk II Receiver is Working
    • How to tell if your Mk II Transmitter is working
    • What to do when you find an unresolvable problem when troubleshooting
  • Copyright
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  1. Multi-Unit Operation (Swarms)

Multi-Unit n:1 (mobile transmitter)

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Last updated 6 months ago

The Multi-Unit n:1 (mobile transmitter) case has any number of receivers on AUVs, ROVs or divers, with a single transmitter also on an AUV, ROV or diver.

The position of each receiver relative to the transmitter is updated at 1 Hz.

If swarming, the best vertical results will be had by also using a pressure sensor for calculating depth.

The Mk II model is the only ROVL model that can operate in this configuration. The receivers and transmitter must periodically address the relative clock drift (every hour or two) by periodically surfacing and re-acquiring the GPS signal.

This configuration is mostly useful for coordinating a swarm of AUVs or ROVs. The lead AUV or ROV carries the transmitter. The followers carry receivers, from which they can calculate their positions relative to the lead AUV or ROV (e.g., "I'm 50 meters southeast of the lead AUV"). The lead AUV or ROV can use its transmitted ping ID payload to send a four-bit value to everyone in the swarm. This payload could be used to select predefined mission segments (e.g., "Hey everyone, we should be in phase 10 of the mission, which you already know means we all want to be heading at 272 degrees at 10 knots"), or it could be used to directly select one of 16 different headings, or whatever other clever ideas you can come up with.

If using only Cerulean-supplied equipment, the AUV/ROV/diver position is known only to the individual receiver. If you need to supply a follower AUV/ROV/diver position to the other units or to a topside monitoring system, then you must supply your own communication links and software support.

It is possible to run two independent sets of autosync-capable ROVLs in a single operating area, by running one set on channel A and one set on channel B.

CeruleanTracker and CeruleanMap softwares do not support the n:1 configuration. Users must write their own software to make use of the positional information supplied.

n Receivers tracking a single transmitter on a mobile platform, with optional receiver (dotted box) also tracking the transmitter