Variable Voxel Shielding Rate Calculation for Radio Wave Assessment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for evaluating the shielding rate of radio waves using point group data are inaccurate due to varying point group density with distance and movement speed, leading to incorrect assessments of Fresnel zone shielding objects.
Innovation Solution
A shielding rate calculation device and method that divides the Fresnel zone into voxels of varying sizes based on acquisition conditions, calculating the shielding rate using the position, shape, and size of voxels indicated by point group data, allowing for accurate evaluation of radio wave shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform voxel size is used for line-of-sight determination in the Fresnel zone, then the calculation process is simple, but the shielding rate evaluation accuracy deteriorates due to varying point group density with distance and movement speed
Solution Approach 1:
The patent applies local quality by making the voxel size variable rather than uniform. Specifically, the voxel size is adjusted according to the distance from the moving body and the acquisition conditions of the point group data. This means that regions closer to the moving body (where point group density is higher) use smaller voxels, while regions farther away (where point group density is lower) use larger voxels. This local adaptation of voxel size to the local data density resolves the contradiction between calculation simplicity and evaluation accuracy.
Solution Approach 2:
The patent implements dynamics by making the voxel size adaptive and variable based on acquisition conditions such as distance and movement speed. Rather than using a fixed uniform grid, the voxel dimensions are dynamically determined according to the local point group data density. This dynamic approach allows the calculation method to adapt to varying measurement conditions while maintaining reasonable computational complexity.
2Productivity
If point group data is acquired by a mobile mapping system, then data collection is efficient and covers large areas, but the point group density varies with distance and movement speed, causing incorrect shielding object assessment
Solution Approach 1:
The patent applies parameter changes by adjusting the voxel size parameter according to the acquisition conditions of the point group data. Specifically, the voxel size is modified based on the distance from the moving body and the movement speed during data acquisition. This parameter adaptation ensures that the evaluation accuracy is maintained across varying data densities while preserving the efficiency benefits of mobile mapping systems.
Data Source
AI summary
One aspect of the present invention is a shielding rate calculation device including a voxel division unit for dividing a Fresnel zone into a plurality of voxels each having a size corresponding to acquisition conditions at the time of acquiring point group data indicating a shielding object in an inter-wireless-station space between a transmission station and a reception station, and a calculation unit for calculating a shielding rate against a radio wave traveling from the transmission station toward the reception station on the basis of a position, a shape, and a size of a shielding voxel, which is a voxel at a position indicated by the point group data, among the plurality of voxels.