Course Estimating Device Using Velocity Integration
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Solution Overview
Problem
Conventional navigation devices experience increased errors in estimated position and course due to noise components from observation errors and acceleration, leading to imprecise calculations.
Innovation Solution
A course estimating device that calculates horizontal ground speed and angular velocity, using integration operations when angular velocity exceeds a turning detection threshold, to determine the estimated position with high precision, reducing reliance on acceleration terms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the double integral of acceleration is used to calculate estimated position, then the estimated position can be obtained, but noise components from observation errors and acceleration increase, leading to increased errors in estimated position and course
Solution Approach 1:
The patent extracts and removes the problematic acceleration term from the position calculation process. Instead of using the double integral of acceleration (which amplifies noise), the invention uses only velocity and position data, effectively taking out the harmful acceleration component while retaining the useful motion information.
Solution Approach 2:
The patent introduces velocity as an intermediary parameter between position and acceleration. By integrating velocity over time to obtain position changes, the system avoids directly integrating acceleration twice, thereby preventing noise amplification while still capturing the essential motion dynamics.
2Loss of information
If acceleration data is integrated twice to calculate position, then position information can be obtained, but errors increase due to noise components
Solution Approach 1:
The patent extracts only the necessary velocity and position components from the motion data, discarding the acceleration term that causes noise amplification. This selective extraction maintains position information completeness while eliminating the source of measurement errors.
Solution Approach 2:
The patent segments the motion calculation into distinct components: position changes are calculated from velocity integration, while acceleration is excluded entirely. This segmentation allows the system to obtain position information without incorporating the noisy acceleration data that would otherwise degrade precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise calculation of the estimated position and course by minimizing errors caused by acceleration noise, resulting in improved accuracy compared to conventional methods.
Implementation Method 1
an angular velocity calculating part measuring or calculating an angular velocity of the movable body
Implementation Method 2
an estimated position calculating part calculating an estimated position based on a period of time from a current time point to an estimation time point, a horizontal ground speed, and an integration operation of the angular velocity when the angular velocity exceeds a turning detection threshold
Data Source
AI summary
The present disclosure is to calculate an estimated position with high precision. A course estimating device 10 includes an angular velocity calculating part 30, a horizontal ground speed calculating part 70 and an estimated position calculating part 80. The angular velocity calculating part 30 measures or calculates an angular velocity of a movable body. The horizontal ground speed calculating part 70 calculates a horizontal ground speed based on an attitude angle, a ground course, and a ground ship speed of the movable body. The estimated position calculating part 80 calculates an estimated position, based on a period of time from a current time point to an estimation time point, the horizontal ground speed, and an integration operation of the angular velocity.