Collaborative Positioning Calibration for Urban Multipath Interference
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Solution Overview
Problem
Traditional Differential Global Positioning Systems (DGPS) face challenges in achieving meter-level accuracy in complex urban environments due to varying multipath interference, which affects positioning calibration.
Innovation Solution
A collaborative positioning calibration system that deploys reference stations to compute and broadcast pseudo-range differences, allowing clients to calibrate their pseudo-ranges based on area-specific correction values derived from signal-to-noise ratio analysis, thereby mitigating multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DGPS uses reference stations with known coordinates to compute pseudo-range differences, then positioning calibration can be achieved, but meter-level accuracy cannot be maintained in complex urban environments due to varying multipath interference
Solution Approach 1:
The patent applies local quality by computing area calibration data specific to each reference station's location rather than using a single universal calibration. Each reference station calculates pseudo-range differences based on its specific geographical position and environmental conditions, allowing clients in different areas to receive location-specific calibration corrections that account for local multipath interference patterns.
Solution Approach 2:
The patent segments the calibration process by dividing the service area into multiple regions, each with its own reference station and area calibration data. This segmentation allows each region to be calibrated independently based on its specific multipath interference characteristics, improving overall positioning accuracy in complex urban environments.
2Measurement precision
If reference stations are deployed to provide calibration data, then positioning accuracy improves, but system complexity increases
Solution Approach 1:
The patent implements self-service by enabling reference stations to autonomously compute their own area calibration data using their known coordinates and received satellite signals. The reference stations automatically calculate pseudo-range differences and broadcast calibration data without requiring manual configuration or external control, simplifying system operation while maintaining accuracy.
Solution Approach 2:
The patent applies universality by designing a system where reference stations serve multiple functions: they receive satellite signals, compute pseudo-range differences, generate area calibration data, and broadcast corrections to clients. This multi-functionality reduces the need for separate calibration devices and simplifies the overall system architecture.
3Measurement precision
If area calibration data is broadcast to clients, then multipath interference is mitigated, but signal transmission requirements increase
Solution Approach 1:
The patent implements feedback by having reference stations broadcast area calibration data back to clients based on their observed pseudo-range differences. This feedback mechanism allows clients to receive real-time correction information that compensates for multipath interference, improving positioning accuracy while using efficient broadcast transmission to minimize information loss.
Data Source
AI summary
An embodiment disclosed a system for collaborative positioning calibration, comprising at least one reference station and at least one client. The reference station uses a known position and a satellite signal transmitted by at least one satellite to compute a pseudo-range difference of the reference station position and the satellite position, and then broadcasts an area calibration data including at least one pseudo-range difference to at least one client. Based on the area calibration data, the client computes at least one pseudo-range calibration data and outputs a calibrated position of global positioning system.