Trajectory Smoothing for Mobile Mapping Virtual Level Differences
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Solution Overview
Problem
Mobile Mapping Systems (MMS) face issues with spatial discontinuities and local distortions in trajectory data due to changes in satellite signal reception and vehicle vibrations, leading to inaccuracies in three-dimensional point group data generation.
Innovation Solution
A data processing device and method that includes a trajectory calculating unit, virtual level difference detecting unit, and trajectory smoothing unit to identify and smooth virtual level differences in the trajectory, allowing for the generation of synthetic point group data with reduced errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite positioning data and inertial positioning data are used to calculate trajectory, then three-dimensional positional information can be acquired, but spatial discontinuity and virtual level differences occur due to signal reception changes and vehicle vibrations
Solution Approach 1:
The patent applies preliminary action by detecting virtual level differences in the trajectory before generating the final three-dimensional point group data. The trajectory correction unit pre-processes the trajectory data by identifying and correcting spatial discontinuities caused by signal reception changes and vehicle vibrations, ensuring that the subsequent synthesis with measurement point group data produces accurate and continuous three-dimensional positional information without propagating trajectory errors
Solution Approach 2:
The patent implements feedback by using the detected virtual level differences to continuously adjust and correct the trajectory data. The trajectory correction unit monitors the trajectory for spatial discontinuities and applies real-time corrections based on the detected anomalies, creating a closed-loop system that improves the reliability and continuity of the trajectory data while maintaining measurement precision
2Measurement precision
If trajectory smoothing is applied to correct virtual level differences, then accuracy of three-dimensional point group data is improved, but processing time and computational complexity increase
Solution Approach 1:
The patent applies local quality by focusing trajectory smoothing and correction operations only on specific sections of the trajectory where virtual level differences are detected, rather than processing the entire trajectory uniformly. The trajectory correction unit identifies localized spatial discontinuities and applies correction algorithms only to those affected segments, thereby improving the accuracy of three-dimensional point group data while minimizing the additional processing time and computational complexity that would result from global trajectory reprocessing
Data Source
AI summary
Provided is a data processing device including a trajectory calculating unit configured to calculate a trajectory of a mobile body that moves in a measurement section, based on measurement data acquired by the mobile body, a virtual level difference detecting unit configured to detect a virtual level difference occurring in the trajectory, a trajectory smoothing unit configured to smooth the trajectory in a section before and after the virtual level difference according to a magnitude of the virtual level difference, and a point group data generating unit configured to generate synthetic point group data by synthesizing the smoothed trajectory and point group data included in the measurement data.