IMU & GNSS
Antenna height measurements and vertical reference points
Antenna height connects a surveyed ground mark to the reference point used by the GNSS processing model.
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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
Base station coordinates: the reference error every rover can inherit
A relative rover solution is tied to the coordinates assigned to its reference station.
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IMU & GNSS
RTK baseline length and the limits of common error cancellation
Relative GNSS positioning benefits when reference and rover observations share similar error components.
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IMU & GNSS
Correction age and communication gaps in RTK acquisition
RTK relies on reference information associated with observation times.
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IMU & GNSS
RTK fixed and float: interpreting a status without overclaiming accuracy
An RTK float solution estimates carrier ambiguities as real valued parameters, while a fixed solution accepts a set of integer ambiguities under the processing model.
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IMU & GNSS
Cycle slips in carrier phase data: finding the discontinuity
A carrier phase cycle slip is a discontinuity in the tracked whole cycle count, commonly associated with loss of lock or signal interruption.
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IMU & GNSS
GNSS multipath near buildings, vehicles, and water
Multipath occurs when a receiver observes reflected signals in addition to, or instead of, the direct path.
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IMU & GNSS
Satellite geometry and dilution of precision in mapping logs
Dilution of precision describes how satellite geometry amplifies measurement uncertainty under a stated estimation model.
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IMU & GNSS
Code and carrier phase GNSS observations: what changes in the workflow
GNSS code observations estimate signal travel time through a recognizable transmitted pattern.
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IMU & GNSS
Clock synchronization between camera, GNSS, and inertial logs
Synchronization establishes how timestamps from different devices refer to the same physical instant.
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IMU & GNSS
GNSS outages and inertial coasting: mapping the uncertain interval
When GNSS aiding becomes unavailable, an integrated solution may continue by propagating its inertial state.
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IMU & GNSS
INS initialization and alignment before a mapping mission
An inertial navigation solution needs an initial position, velocity, and attitude.
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