Inertial Labs Knowledge Base


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      What Heading Correction Type Do I Use for My Application?

      Posted by Luke Wilson on Aug 20, 2020 11:21:09 AM

      Purpose: To determine which type of heading correction is best for different applications of the INS.

      Last Updated: June 2020

      For INS-D/DL: The “Dual GNSS” type of heading correction can be used for any application that allows the installation of the INS and two GNSS antennas with a baseline of at least 1.5 m (it can be static, quasi-static, and slowly moving objects as well as objects with high dynamic). So, any application where two antennas can be installed with a clear view of the sky and less than 1.5 meters away from one each other. When Dual GNSS type is used, the algorithm starts as soon as the GNSS receiver provides a heading solution.

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      Topics: INS, INS-D, INS-DL, INS-B, INS-P, GNSS, Heading, Magnetometer, Correction

      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

      Configuring the INS to Output Data After Power is On (Auto-Start)

      Posted by Luke Wilson on Aug 20, 2020 11:03:57 AM

      Purpose: To understand how to configure the INS to start outputting data after power is on without any command from the host computer.

      Last Updated: June 2020

      There are two different auto start options in the Graphic User Interface (GUI). The first one gives the ability for the GUI to accept data from the INS when it is in auto start mode. This setting should only be used if the user plans on using the device in the GUI.

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      Topics: INS, Data, GUI, Auto, Auto-Start, Output, Power, Automatic

      How to Use Encoder with the INS

      Posted by Luke Wilson on Aug 20, 2020 10:56:53 AM

      Last Updated: June 2020

      Purpose: To show what steps to take in order to use the available encoder in the INS.

      There are two hardware options for encoder connections. Either the use can use encoder lines used to connect to Ethernet lines in the Multiport Development Kit (which connects to INS) or use encoder lines and connect them to the COM1 port on the Multiport Development Kit which is an RS-422 interface. You can contact Inertial Labs to order an INS unit with encoder input support and select the preferable connection option.

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      Topics: INS, COM, Hardware, encoder

      Useful Wave Sensor Equation and Parameter Definitions

      Posted by Luke Wilson on Aug 20, 2020 10:47:13 AM

      Last Updated: June 2020

      Purpose: To provide users with some of the commonly used equations for the Wave Sensor as well as provide other equations that may be helpful in implementing the sensor for the specific end-user application.

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      Topics: Sensor, Wave, Equations

      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

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