IMU & GNSS
GNSS and IMU integration: understanding complementary information
GNSS and inertial measurements describe motion in complementary ways.
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THE DRONE COLLAB JOURNAL
Better drone maps start with better decisions.
Explore practical photogrammetry, GNSS, IMU, GIS and remote sensing methods. Technical explanations, worked examples and field checks for the people turning aerial photographs into usable maps.
1554 articles13 topics
Flight planning
Terrain-Following Capture for Coastal Settlement Corridors
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IMU & GNSS
Camera boresight alignment: separating angular offsets from position offsets
Boresight describes the angular relationship between a camera and a navigation or inertial frame.
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IMU & GNSS
Antenna to camera lever arms: measuring the right origin
A GNSS receiver estimates the position of a defined antenna reference while an image is formed around a camera perspective center.
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IMU & GNSS
Euler angles and quaternions in drone navigation exports
Euler angles describe orientation through an ordered set of rotations.
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IMU & GNSS
Sensor axes and mounting frames: preventing sign errors before processing
A sensor body frame, an aircraft frame, a camera frame, and an earth frame can all use different axis directions.
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IMU & GNSS
Temperature and inertial calibration: testing the conditions that matter
Inertial sensor offsets and sensitivities can vary with temperature, and the temperature measured inside an instrument may lag the surrounding air.
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IMU & GNSS
Allan deviation for IMU logs: useful evidence with clear limits
Allan deviation examines how the variability of averaged measurements changes with averaging time.
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IMU & GNSS
Vibration and inertial sensing: diagnosing motion that sampling can hide
Airframe vibration reaches an inertial sensor through its mount and can create more than obvious high frequency oscillations.
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IMU & GNSS
Accelerometer bias and the double integration problem
An accelerometer bias is an additive error in specific force.
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IMU & GNSS
Gyroscope bias: why small rate offsets become attitude errors
A gyroscope bias is a rate offset that remains after the true angular motion is removed.
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IMU & GNSS
IMU measurements and INS solutions: keeping the distinction clear
An inertial measurement unit supplies angular rate and specific force along its sensing axes.
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Photogrammetry
Combining Different Cameras only when the Evidence Supports It
When does mixing photographs from several camera systems strengthen a project, and when does it create avoidable uncertainty? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
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