Inertial Labs Knowledge Base


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      Luke Wilson

      Applications Engineering Intern at Inertial Labs.

      Recent Posts

      How Can I Estimate the LiDAR Point Density for My Flight?

      Posted by Luke Wilson on May 13, 2021 11:41:02 AM

      Purpose: To get a better understanding of the necessary distance between flight passes for your project.

      Last Updated: May 2021

      Firstly, it is important to note that the point density of a project is dependent on the following listed factors.

      • LiDAR scanner field of view
      • Flight AGL (Above Ground Level)
      • Flight Speed
      • LiDAR Scan Rate
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      GNSS Correction Services for INS-DU

      Posted by Luke Wilson on Oct 5, 2020 2:15:15 PM

      Purpose: To understand the different GNSS correction services that can be used to enhance the performance and precision of the INS-DU.

      Last Updated: October 2020

      There are 2 different categories of GNSS correction services. These categories are based on either the State Space Representation (SSR) or Observation State Representations (OSR) of the errors. Both categories solve the same problem, but each use different techniques, delivery mechanisms, and core technologies to do so. Both SSR and OSR correction services are used to mitigate key GNSS errors (i.e. orbits, biases, clocks, etc.) in order to enable high precision GNSS performance.

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      Topics: INS, GNSS, receiver, Service, Correction, INS-DU

      GNSS Signal, Correction, and Constellations

      Posted by Luke Wilson on Sep 23, 2020 5:43:55 PM

      Purpose: Global Navigation Satellite Systems (GNSS) such as GPS or BeiDou can sometimes have confusing terminology. This knowledge base document will explain some of the most commonly used terms regrading GNSS

      Last Updated: September 2020

      Constellation: A constellation is the collection of satellites that make up a particular system. Some examples of constellations are: GPS, BeiDou, Galileo, and GLONASS.

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      Topics: Constellation, GPS, GNSS, BeiDou, GLONASS, Galileo, Signals, Frequencies, Correction

      Grounding of Your Device With a GNSS Receiver

      Posted by Luke Wilson on Aug 21, 2020 1:23:19 PM

      Purpose: To understand the grounding of an Inertial Labs device with a GNSS receiver and to understand the configuration of the TNC antenna cable shield.

      Last Updated: July 2020

      The shield of the TNC antenna cable is connected to the chassis of the device, and on the GNSS receiver this shield is connected to the power return potential. Since that is the case, the whole enclosure is under the same potential. We recommend users to isolate the chassis from the power return potential if it is required in their application, as we have not had any problems related to chassis isolation in any application.

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      Topics: GNSS, receiver, TNC, Antenna

      Manually Converting a .flash File to a .prm File

      Posted by Luke Wilson on Aug 20, 2020 1:49:29 PM

      Purpose: To understand how to convert a .flash file to .prm file.

      Last Updated: August 2020

      First, the user should open their .flash file in notepad++.

      Then, they should install “Hex-editor” plugin by going to the “Plugins” menu, then select “Plugins Admin”, then navigate to the “Available” tab, then click “Install”.

      Read More

      Topics: Parameters, Flash, File, Converting, PRM

      Support Thread: The Window of the GUI is Smaller than Normal?

      Posted by Luke Wilson on Aug 20, 2020 1:25:19 PM

      Purpose: To provide a solution to bug that makes the toolbar containing icons smaller than it is supposed to be.

      Last Updated: July 2020

      When using the IMU GUI, it is possible that your window may appear as below. Note how the icon toolbar at the top is much smaller than it typically appears. The difference in the two windows can be seen in the image below.

      Read More

      Topics: IMU, Windows, GUI, Sizing, Icon, Small

      What is the Initial Alignment and How Does it Improve the Device's Performance?

      Posted by Luke Wilson on Aug 20, 2020 11:52:05 AM

      Purpose: To understand how the initial alignment improves the performance of the INS.

      Last Updated: June 2020


      What is it?

      During the Initial Alignment time, the INS estimates biases of the gyroscopes by measuring the current condition it is in (which should be static). The device can use these estimated biases in the Kalman Filter to help the device recognize the difference between when the unit is moving and when the gyroscopes are drifting. As a result, the initial alignment helps to improve the INS dynamic accuracy.

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      Topics: Bias, Increase, Alignment, Performance, Initial, Gyroscope, Gyro, Estimation

      How to Setup RTK Corrections for INS

      Posted by Luke Wilson on Aug 20, 2020 11:46:57 AM

      Purpose: To understand how to arrange RTK corrections for an INS with included RTK.
      Last Updated: July 2020

      For Using Physical Base Station

      To receive the observation data of a remote base station at the rover receiver of the INS and get the RTK solution, the user can use the STRSVR tool from the RTKLIB package.

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      Topics: INS, GNSS, Input, RTCM, Correction, RTK

      Can I Use Dual Antenna INS as Single Antenna System?

      Posted by Luke Wilson on Aug 20, 2020 11:36:23 AM

      Purpose: To understand how to use dual antenna INS as a single antenna INS.

      Last Updated: June 2020

      The user should unplug the second antenna and leave the primary plugged in. For reference the primary antenna port is labeled as “A1” on the device, and the secondary antenna port is labeled as “A2”. Then, change the heading correction type in the Graphic User Interface (GUI) from “Dual GNSS” to the one that fits your application. To do so, go to the “Options” tab and then select “Correction options” and then change the correction type.

      Read More

      Topics: INS, GNSS, Heading, Correction, Dual, Single

      Understanding When to Use the Barometer

      Posted by Luke Wilson on Aug 20, 2020 11:31:09 AM

      Purpose: To understand in what cases the barometer should be turned ON and what cases it should be OFF.

      Last Updated: June 2020

      Case 1: In completely GPS-Denied environment, the pressure sensor should be set to primary altitude sensor as shown below.

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      Topics: INS, GPS, Sensor, Barometer, Baro-Altimeter

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