Dead Reckoning Step Length Correction via Satellite Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dead reckoning-based positioning systems suffer from significant errors in calculating step length, leading to inaccurate positioning, especially in environments where satellite signals are weak or unavailable.
Innovation Solution
An electronic device that corrects the estimated step length used in dead reckoning by comparing positioning results from satellite positioning and dead reckoning, using a step length correction process to adjust the step length based on satellite positioning data, thereby improving positioning accuracy without relying on map information or pre-known routes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dead reckoning-based positioning is used to calculate position without satellite signals, then positioning can be performed in areas with poor satellite coverage, but significant errors accumulate in step length calculation leading to inaccurate positioning
Solution Approach 1:
The system uses satellite positioning results as feedback to continuously correct the step length parameter in dead reckoning calculations. When satellite signals are available, the calculated position and step length are compared with satellite positioning results, and the step length is adjusted to reduce accumulated errors, thereby maintaining high positioning accuracy in both satellite-available and satellite-denied environments
Solution Approach 2:
The system dynamically changes the step length parameter based on feedback from satellite positioning data. By adjusting this key parameter using the ratio between dead reckoning distance and satellite positioning distance, the system adapts to varying walking conditions and reduces cumulative errors, resolving the contradiction between positioning availability and accuracy
2Measurement precision
If map information or pre-known routes are used to correct positioning errors, then positioning accuracy can be improved, but the system cannot be used in new or unknown areas
Solution Approach 1:
The system performs self-correction by using its own satellite positioning results to adjust its step length parameter. This self-service mechanism eliminates the need for external map information or pre-known routes, allowing the system to maintain high positioning accuracy in both familiar and new areas, thereby resolving the contradiction between positioning accuracy and adaptability
3Measurement precision
If satellite positioning alone is used, then positioning accuracy is high when signals are available, but positioning fails in areas with weak or unavailable satellite signals
Solution Approach 1:
The system merges satellite positioning and dead reckoning positioning into a hybrid system. Satellite positioning provides accurate position fixes when available, while dead reckoning continuously estimates position using step count and step length. The step length correction mechanism ensures the dead reckoning component remains accurate, and the system seamlessly switches between or combines both methods, achieving both high accuracy and reliability across all environments
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Correction of errors in dead reckoning includes: obtaining, without using map information, a first distance between a first location of a user and a second location of the user based on acquired GPS positional information of the first location and acquired GPS positional information of the second location; obtaining, without using map information, a second distance between the first location and the second location, by using dead reckoning based on a step count and a step length of the user as the user travelled from the first location to the second location; and correcting the step length of the user that is used in the dead reckoning on the basis of the first distance obtained by the first distance obtaining process and the second distance obtained by the second distance obtaining process.