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      What is ZUPT and When Do I Use It?

      Posted by Luke Wilson on Aug 20, 2020 11:25:12 AM

      Purpose: To understand which cases ZUPT should be ON and which case ZUPT should be OFF.

      Last Updated: June 2020

      ZUPT - or Zero Update Position and Timing, is used to mitigate gyroscope bias drift and in turn mitigate heading drift in a GPS-Denied environment. It should be enabled when the user wants to reduce its accumulated orientation and position errors once a carrier object stops. If a completely motionless state is not achievable, then the user should disable the ZUPT option.

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      Topics: INS, Error, Position, ZUPT

      How to Improve Position Accuracy in GNSS Denied Environments

      Posted by Luke Wilson on Aug 20, 2020 11:13:22 AM

      Purpose: To explain what INS features improve position error in GNSS denied environments.

      Last Updated: June 2020

      When using the Inertial Navigation System (INS), position error accumulation is always a concern. One way a user can limit this error is by enabling the “Tunnel Guide” feature (only available for fixed-axle land vehicle).  When enabled, it allows the INS to reduce its accumulated errors during extended GNSS outages. Use this feature when external aiding data is unavailable. To do so, go to the “Correction options window of the “Options” tab and enable “Tunnel guide” as shown below.

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      Topics: GPS Denied Navigation, INS, Error, Position, Accuracy, Increase, ZUPT, Outage

      Mitigating Large Position Errors in INS/MRU/WS with GNSS Receiver

      Posted by Will Dillingham on Aug 19, 2020 2:29:16 PM

      Purpose: The purpose of this Knowledge Base article to is outline a few commonly seen issues and fixes that surround large GNSS position errors seen internationally. It is important to note that these issues are not at the fault of Inertial Labs products, but satellite line of sight issues, and satellite correction services.

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      Topics: MRU, INS, receiver, Error, Position, EGNOS, WS, SBAS, Correction

      Support Thread: Time Offset Between GPS Data and INS Data

      Posted by Will Dillingham on Aug 19, 2020 2:09:06 PM

      Purpose: To give insight for the potential user on a commonly seen misunderstanding in the difference between UTC and GPS timestamps.

      Last Updated: March, 2020



      I have found one issue that I am currently confused with. The timestamp recorded from COM1 of the INS is consistently 17-20 seconds fast. If I start recording at 00 seconds, the first timestamp is equal to 17+ seconds, however the location data that comes from the GPS receiver is correct for 00 seconds and not 17+ seconds. Any insights into this issue?

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      Topics: INS, GPS, Difference, UTC, Time, Offset, Position

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