Inertial Labs Knowledge Base


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      Will Dillingham

      Now graduated from Virginia Polytechnic Institute with a degree in Engineering Science and Mechanics, Will Dillingham is fully equipped to tackle all problems involving fundamental mechanics. During his time at Inertial Labs, Will has established himself as a jack-of-all-trades. From managing production projects, to maintaining and updating the website, to providing customer support, Will is a great authority on all things Inertial Labs. His main work priorities lie as an Application Engineer at Inertial Labs but in his side time he has nurtured a passion for rocketry and has experimented and tested composite propellants.
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      Recent Posts

      How to Update Firmware on the RESEPI

      Posted by Will Dillingham on Jun 3, 2021 5:20:41 AM

      Purpose: To understand how to find your current firmware version and update the firmware to the latest firmware version (if needed).

      Last Updated: May 2021

      Periodically, the Inertial Labs support team will send out new firmware updates.

      To see your current firmware version, look in the upper right portion of the interface if you are on desktop like shown below.

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      Topics: update, Firmware, RESEPI

      RESEPI Camera is Not Shown in Interface

      Posted by Will Dillingham on May 21, 2021 3:32:20 AM

      Purpose: To provide solutions for why the RESEPI GUI is not displaying the camera.

      Last Updated: May 2021

      Before a flight, it is best to check the “Status” page of the RESEPI web GUI where the user should note that the LiDAR and camera are present like shown below.

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      Topics: LiDAR, GUI, RESEPI

      IMU-P Characteristic Determination Method Used for ARW, VRW and Bias Instability for Gyroscopes and Accelerometers in IMU-P

      Posted by Will Dillingham on Aug 19, 2020 3:18:48 PM

      Purpose: The purpose of this Knowledge Base document is to inform end-users of the methods that are used by Inertial Labs for determining Angular Random Walk, Velocity Random Walk and Bias Instability for the MEMS-based Accelerometers and Gyroscopes used by Inertial Labs in the IMU-P.

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      Topics: IMU-P, Velocity, ARW, Angular, Random, Walk, VRW, Bias, Instability

      Coning and Sculling Integration Methods

      Posted by Will Dillingham on Aug 19, 2020 2:33:54 PM

      Purpose: The purpose of this knowledge base article is to explain the method of integration known as Coning and Sculling used by Inertial Labs.

      Updated: March, 2020

      For strap-down based inertial sensors, the method of integration known as sculling (for linear accelerations) and coning (for angular rates) has been implemented for all Inertial Labs sensing components to reduce the erroneous build up of seemingly valid measurements of accelerations and angular rates. These errors, if left unaccounted for then produce further errors in calculations for velocity and attitude in inertial based navigation systems and attitude and heading reference units.

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      Topics: Coning, Integration, Methods, Sculling

      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

      Inertial Navigation System Data Flow Chart

      Posted by Will Dillingham on Aug 19, 2020 2:25:00 PM

      Purpose: The purpose of this Knowledge Base article is to show how information is used from respective sensors inside the Inertial Navigation System. Although a complex product, this diagram breaks down the different functions and explains how data is used and how it can be accessed on the device.

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      Topics: INS, Data, Flowchart, Flow, Communication, Ports, COM

      Device is Not Seeing Proper Number of Satellites

      Posted by Will Dillingham on Aug 19, 2020 2:19:59 PM

      Purpose: The purpose of the this knowledge base document is to explain the potential interference caused by ports such as USB3.0 in interfering with satellite line of sight (LOS).

      Last Updated: March, 2020

      High-frequency devices, like high-speed processors or high-speed communication buses (say, USB3 or PCIExpress) are known to produce electromagnetic interference (EMI) in the 1.2 – 1.5 GHz range, where all GNSS signals reside.

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      Topics: USB, INS, Interference, Satellite, EMI

      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

      LabVIEW Driver for IMU-P, MRU and INS

      Posted by Will Dillingham on Aug 19, 2020 2:02:14 PM

      Purpose: To direct product users to the LabVIEW drivers for the Inertial Labs IMU-P, MRU and INS.

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      Topics: MRU, IMU, INS, Driver, LabVIEW

      Support Thread: Connecting to Windows 10 works, but not for Windows 7? Unit does not appear in "Device Manager" on host-PC?

      Posted by Will Dillingham on Aug 19, 2020 1:58:19 PM

      Purpose: To diagnose the common issue of a user being able to connect to an Inertial Labs Inertial Navigation System using Windows 10 but when using a different operating system, such as Windows 7, the unit will not connect.

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      Topics: INS, Driver, FT230x, Error, Windows, 7, 10

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