Dual-Polarization Weather Radar Data Composition via Earth Spherical Coordinates
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Solution Overview
Problem
Dual-polarization weather radar observation data conversion into an orthogonal coordinate system is complex and prone to errors due to the need for multiple projection processes, leading to inaccurate comparisons with numerical value model data and ground observing instrument data.
Innovation Solution
An apparatus and method that convert dual-polarization weather radar data into an orthogonal coordinate system using an earth spherical coordinate system through a single projection process, involving a coordinate system converting unit, CAPPI data generating unit, and CAPPI data compositing unit, which map and compose CAPPI data for each dual-polarization weather radar, reducing the complexity and error accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-polarization weather radar observation data is converted into CAPPI data for each altitude through multiple projection processes, then the data can be composed for national radar observation network region, but the calculation process becomes complicated and errors increase as distance from radar center increases
Solution Approach 1:
The patent segments the coordinate transformation process into two independent stages: first transforming radar spherical coordinates to Earth spherical coordinates, then to orthogonal coordinates. This segmentation allows each transformation to be handled separately, reducing complexity and error accumulation compared to multiple sequential projections through CAPPI data for each altitude.
Solution Approach 2:
The patent introduces Earth spherical coordinates as an intermediary coordinate system between the radar spherical coordinate system and the orthogonal coordinate system. This intermediary enables a more accurate and direct transformation path, avoiding the complex multiple projections required when converting through CAPPI data for each altitude.
2Adaptability or versatility
If multiple projection processes are applied to convert radar data to orthogonal coordinate system, then composition for national radar observation network region can be achieved, but errors are accumulated and comparison results with numerical value model data become inaccurate
Solution Approach 1:
The transformation is segmented into distinct coordinate systems (radar spherical → Earth spherical → orthogonal), with each segment handling a specific aspect of the transformation. This reduces error accumulation compared to applying multiple projection processes sequentially through CAPPI data for each altitude.
Solution Approach 2:
The patent changes the transformation parameters by using Earth spherical coordinates as the intermediate reference frame, which better represents the Earth's curvature and enables more accurate distance and angle calculations compared to repeated orthogonal projections.
3Productivity
If dual-polarization weather radar observation data is converted through multiple projection processes, then CAPPI data can be generated for each observation point, but the application location needs to be found by applying interpolation which increases error
Solution Approach 1:
The patent extracts the coordinate transformation into a separate, dedicated process that directly maps radar coordinates to orthogonal coordinates through Earth spherical coordinates. This eliminates the need to generate and process CAPPI data for each altitude separately, removing the interpolation step that introduces errors.
Solution Approach 2:
Earth spherical coordinates serve as an intermediary that enables direct transformation from radar coordinates to orthogonal coordinates, avoiding the need for intermediate CAPPI data generation and interpolation processes that reduce data accuracy.
Data Source
AI summary
An apparatus for composition for dual-polarization weather radar observation data includes: a coordinate system converting unit that converts a reference grid of an orthogonal coordinate system into a grid of a dual-polarization weather radar spherical coordinate system based on a latitudinal-longitudinal coordinate system for each individual dual-polarization weather radar by using an earth spherical coordinate system; a CAPPI data generating unit that generates CAPPI data based on the orthogonal coordinate system after mapping individual items of dual-polarization weather radar observation data on grid coordinates of the dual-polarization weather radar spherical coordinate system; and a CAPPI data compositing unit that performs composition of CAPPI data for each of the individual dual-polarization weather radars located at the same coordinate of the orthogonal coordinate system obtained by mapping the individual items of dual-polarization weather radar observation data thereon.