Position Calculating Device Using Dynamic Kalman Filter Coefficients
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Solution Overview
Problem
The accuracy of position calculation using inertial navigation systems (INS) is compromised due to errors in inertial sensor detection results, and correcting these with GPS results is hindered by GPS signal intensity, reception environment, and satellite arrangement issues, leading to decreased overall position calculation accuracy.
Innovation Solution
A method that combines the use of inertial positioning units and satellite positioning units through a two-step process: first, calculating the position using inertial measurements, and second, refining this with satellite data, while adjusting operational coefficients based on the results of both processes to enhance accuracy, employing Kalman filtering and weighted averaging to estimate and correct for errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS operation result is used to correct INS operation result, then position calculation accuracy can be improved, but the accuracy is lowered when GPS signal intensity is weak, reception environment is poor, or satellite arrangement is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the INS operation result is used to evaluate GPS quality, and this evaluation feeds back to adjust the correction process. Specifically, the system calculates a quality indicator based on the difference between INS and GPS results, and uses this feedback to dynamically adjust the weight or application of GPS correction, preventing degradation when GPS quality is poor
Solution Approach 2:
The patent applies dynamic adjustment of the correction process based on real-time GPS signal quality. The system continuously monitors GPS signal intensity, satellite arrangement, and the consistency between INS and GPS results, dynamically adjusting the correction parameters or weight factors to optimize position calculation accuracy under varying environmental conditions
2Measurement precision
If GPS correction is applied to INS operation result, then position accuracy can be enhanced, but overall accuracy decreases when GPS measurement quality is poor
Solution Approach 1:
The patent converts the harmful effect of GPS errors into a beneficial quality evaluation metric. By analyzing the discrepancy between INS and GPS results, the system identifies GPS quality issues and uses this information to adjust the correction process, thereby preventing harmful GPS errors from degrading the overall position accuracy
Solution Approach 2:
The patent introduces a quality evaluation mechanism as an intermediary between GPS correction and INS results. This intermediary assesses GPS signal quality and determines the appropriate level of correction application, acting as a buffer that prevents poor-quality GPS data from directly degrading the position calculation
Data Source
AI summary
In a position calculating device, a first operational process of calculating at least a position of a moving object using the measurement result of an inertial positioning unit disposed in the moving object is performed by a first operation processing unit. A second operational process of calculating the position of the moving object using the result of the first operational process and the measurement result of a satellite positioning unit disposed in the moving object is performed by a second operation processing unit. An operational coefficient of the first operational process is adjusted using the result of the first operational process and the result of the second operational process by an operational coefficient adjusting unit.