Position Measurement System Using Satellite Visibility Switching
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Solution Overview
Problem
Conventional GPS systems face challenges in accurately measuring the position of a moving object in areas with high building density or signal interference, leading to reduced accuracy and increased power consumption due to the need for complex calculations and reliance on multiple satellite signals.
Innovation Solution
The system determines GPS satellite visible and invisible areas based on real-world height information and satellite orbit data, switching between primary and secondary position measurement schemes depending on satellite visibility, using Ephemeris information and alternative methods like Wi-Fi or image comparison when satellites are not visible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS triangulation scheme is used to measure position, then position measurement capability is achieved, but measurement precision deteriorates in areas with high buildings or signal interference
Solution Approach 1:
The system dynamically determines whether the moving object is in a GPS satellite visible area or invisible area, and switches between different position measurement schemes accordingly. In visible areas, GPS triangulation is used for high precision, while in invisible areas, alternative schemes (Wi-Fi, image comparison, inertial navigation) are employed to maintain reliability
Solution Approach 2:
The system changes the measurement parameters and methods based on the GPS signal quality and satellite visibility. When GPS signals are strong and satellites are visible, standard GPS parameters are used. When signals are weak or blocked, the system transitions to alternative measurement parameters such as Wi-Fi signal strength, image feature matching, or inertial navigation data
2Measurement precision
If GPS position measurement is performed using multiple satellite signals and complex calculations, then position accuracy is maintained, but power consumption increases
Solution Approach 1:
The system performs GPS position measurement only partially or selectively - using full GPS processing only when satellites are visible and signal quality is good. In GPS-invisible areas, it uses alternative measurement schemes that consume less power, avoiding the excessive power consumption of continuous full GPS processing
Solution Approach 2:
The system periodically checks GPS satellite visibility and signal quality, and only activates the power-intensive GPS calculation process when conditions are favorable. Between GPS measurements, it may use lower-power alternative methods or maintain position through prediction algorithms
3Measurement precision
If conventional GPS scheme is used in GPS invisible areas, then position measurement is attempted, but measurement precision deteriorates due to signal noise and errors
Solution Approach 1:
The system identifies GPS-invisible areas where signal noise and interference are harmful, and converts this situation into a benefit by switching to alternative measurement schemes that are not affected by GPS signal quality. The harmful GPS signal condition triggers the use of complementary methods (Wi-Fi positioning, image recognition, inertial navigation) that thrive in such environments
Data Source
AI summary
Disclosed herein is a method for measuring a position. The method for measuring a position includes: determining a GPS satellite visible area and a GPS satellite invisible area depending on whether or not an area is an area in which a predetermined number or more of GPS satellites are observable; measuring a position of a moving object on the basis of a first position measuring scheme using GPS satellites in the case in which the moving object enters the GPS satellite visible area; and measuring the position of the moving object on the basis of at least one of the first position measuring scheme and a second position measuring scheme other than the first position measuring scheme in the case in which the moving object enters the GPS satellite invisible area.