Map Data Fusion Without Coordinate Offset Error Accumulation
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Solution Overview
Problem
Current autonomous driving systems face low positioning accuracy due to accumulated errors from the conversion between the WGS84 and GCJ-02 coordinate systems, which are not eliminable and disrupt continuous positioning data, making them unreliable for long distances.
Innovation Solution
The system processes map data by avoiding offset processing in the data fusing unit, ensuring that fused positioning data remains in the WGS84 coordinate system, and only performs offset processing after fusion is complete, thereby eliminating accumulated errors and improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset processing is performed in the data fusing unit during coordinate system conversion, then positioning data can be processed, but accumulated errors are generated and transmitted, degrading positioning accuracy
Solution Approach 1:
The patent segments the positioning system into two distinct processing paths: one for WGS84 coordinate data (used for data fusion and positioning calculation) and another for GCJ-02 coordinate data (used only for map display). The data fusing unit processes only WGS84 coordinates without offset conversion, eliminating the source of accumulated errors while still enabling positioning functionality.
Solution Approach 2:
The patent introduces an intermediary coordinate system (WGS84) that serves as a neutral processing layer between the satellite positioning system and the encrypted map system. By performing all positioning calculations in WGS84 coordinates and only converting to GCJ-02 for final map display, the system avoids introducing offset errors into the positioning calculation chain.
2Ease of operation
If coordinate system conversion with offset is performed continuously, then map data can be displayed, but non-linear random errors are introduced, disrupting continuous positioning data
Solution Approach 1:
The patent separates map display functionality from positioning calculation functionality. Map display uses GCJ-02 coordinates with offset processing, while positioning calculations use WGS84 coordinates without offset. This segmentation allows map display to proceed independently without introducing errors into the positioning data stream, maintaining continuity and reliability of positioning information.
Data Source
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AI summary
The present application discloses a method and an apparatus for processing map data, which relate to autonomous driving technologies in the field of data processing. The specific implementation is that: a controlling unit inputs initial positioning data collected by a data collecting unit to a data fusing unit to obtain fused positioning data, where the initial positioning data and the fused positioning data are data in a first coordinate system; the controlling unit obtains target positioning data according to the fused positioning data, where the target positioning data is data in a second coordinate system, and the second coordinate system is a coordinate system obtained by offsetting the first coordinate system; and the controlling unit performs a positioning operation on the target positioning data through at least one positioning unit, to determine a position of a vehicle corresponding to an autonomous driving system. By calculating the fused positioning data in the first coordinate system without offset, the generation and accumulation of errors can be effectively avoided, so as to ensure that the accuracy of positioning is effectively improved on the basis of compliance with regulations.