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AB- V-MA-00650 

01 February 2021 

JF/RR 

15 

LD900 and INS 

Commissioning  Guide 

Configuration 

At this stage, the IMU is securely mounted with offsets determined, powered up and connected to a LD900 
COM port. The LD900 has been activated for PPP solution, which is converged and stable and the LD900 is 
ready for configuration. The LD900 can be configured via the MMI as detailed in the next section, or by using 

Quantum.

  

 

LD900 Configuration

 

Heading 

Accessing the menu 

Configuration > Heading

 within the LD900 MMI will allow for the LD900 heading to be 

set-up. 

State

 controls if heading is computed and available from the system. While 

Edit

 on the same row as 

State

 is 

selected, use tick to bring up the 

Heading State

 and using the arrow keys select 

Enabled

, followed by tick. 

Then use the arrow keys to select 

Apply

, right to select 

Yes

 and tick to apply: 

       

             

  

To configure the heading offset (C-O) select 

Edit

 for the 

Heading Offset

 row, followed by tick. Then use the 

arrow buttons and tick to enter the GNSS heading offset. Use the arrow keys to select 

Apply

, right to select 

Yes

 and tick to apply the change:  

       

             

 

 

 

 

 

 

Summary of Contents for VERIPOS INS

Page 1: ...terfacing Alignment Calibration Rotational Offset Adjustment Configuration Operation Troubleshooting Appendix A Equipment Required Appendix B IMU Performance The VERIPOS INS system consists of an LD90...

Page 2: ...ow the codes can be applied to the LD900 Note the INS authorisation code includes the GNSS heading functionality A simple way to check if the LD900 is authorised for INS operations is tocheck if INS i...

Page 3: ...S1 and GNSS2 can be installed across ship The offset would need to align the GNSS heading to the alignment of the actual vessel heading In the example below this will typically be around 90 off from t...

Page 4: ...l Reference Frame IMU Body Frame The definition of the IMU Body frame is given by the physical axes of the IMU and represents how the sensors are mounted inside the IMU Both the IMU Body frame axes an...

Page 5: ...ighlight the centre of navigation differences between the IMU ISA 100C and IMU IMU IC models The different IMU frameworks have pre configured rotational offsets applied by the system configuration whe...

Page 6: ...The installation engineer should endeavour to align the IMU axes as closely as possible with the vessel frame using a general arrangement diagram or by referencing available surfaces such as walls or...

Page 7: ...lied when the IMU is selected within the LD900 or Quantum aligning the IMU Frame with the Vessel Frame Any computed offsets should be added or subtracted from these pre set values The pre set rotation...

Page 8: ...for INS operations The diagram below provides an overview of the principal system component interconnections INS Schematic Example IMU DC Power A 2 metre long DC power supply cable is supplied with t...

Page 9: ...thing point in an equipment rack When checkingthe health of the IMU DC power the Power LED on the IMU can be used as reference RS422 Interfacing A 2 metre long interface cable is supplied with the IMU...

Page 10: ...ose to noisy power lines or other electrical noise sources When checkingthe IMU health the COM LED on the IMU can be used as a reference LED State Meaning Off No communication between IMU and LD900 On...

Page 11: ...e If the rotational offsets are greater than 1 accuracy the INS computations may still initialise but the solution will be negatively impacted and not maintain a converged solution once vessel motion...

Page 12: ...AB V MA 00650 01 February 2021 JF RR 12 LD900 and INS Commissioning Guide INS Translational Offsets...

Page 13: ...he X axis of the IMU is offset to starboard by angle a The Installation Rotation Z 90 value is reduced by the measured angle When the Y axis of the IMU is offset down to the starboard by angle a The I...

Page 14: ...an View When the Z axis of the IMU is offset to starboard by angle a The Installation Rotation Y 90 value is reduced by the measured angle If the measured value for a was 10 degrees the value would re...

Page 15: ...essing the menu Configuration Heading within the LD900 MMI will allow for the LD900 heading to be set up State controls if heading is computed and available from the system While Edit on the same row...

Page 16: ...or INS Operations The IMU Type can be selected within the menu Configuration INS While Edit is selected on the IMU Type row press tick and using the arrow keys select IMU ISA 100C or IMU IMU IC as req...

Page 17: ...tick to select Apply right to select Yesand tick to apply the change Repeat for the same process for the Y and Z offsets Antenna 1 Offset Lever Arm When entering the lever arm offset IMU to GNSS1 ant...

Page 18: ...d If no such areas are shown then request a Quantum Heading license from the VERIPOS Helpdesk Click on Edit found at the bottom right hand corner of the screen SETTINGS System Configuration Receiver M...

Page 19: ...on to the LD900 and IMU Type The two INS IMUs supported for use within Quantum are the IMU ISA 100C and the IMU IMU IC Port The LD900 COM port which the IMU is being interfaced on COM1 COM2 or COM3 sh...

Page 20: ...on is calculated the icon will turn Green and once there has been significant vessel motion an INS Aided notification will appear confirming a blended GNSS and INS solution If there is a problem with...

Page 21: ...NS Aided Message to the right of the Positioning status INS Solution not active or configured INS Solution aligning and converging INS Solution converged and active Within Quantum detailed INS informa...

Page 22: ...nd ZDA output sentences have fixed talker ID s of GP regardless of solution All other NMEA sentences will use a talker ID defined by the constellationin use for instance GN for multiple constellations...

Page 23: ...NSS1 cable and connectors are in a good state withno degradation or visible weathering INS indications remaining in a Red or Amber State Check LED indication on IMU refer to the tables for guidance Co...

Page 24: ...1 Antenna V560 Antenna Antennas providing GNSS Heading S10 16000 2 V86 Antenna Optional dedicated L band antenna if required adjust mounting bracket and cabling quantity appropriately S10 11000 1 Moun...

Page 25: ...0 15 0 008 0 008 0 006 0 006 0 010 10 0 12 0 20 0 013 0 013 0 008 0 008 0 013 60 0 96 0 65 0 048 0 023 0 009 0 009 0 018 IMU IMU IC GNSS Outage Performance Outage Duration Secs Position Accuracy M RM...

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