Single-Satellite RAT Triangulation for GPS-Free UE Location
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Solution Overview
Problem
Existing satellite radio access technology (sat RAT) systems do not specify how to determine the location of standard User Equipment (UE) without GPS or Wi-Fi, which is crucial for location-based services such as emergency calls, child tracking, and criminal tracking.
Innovation Solution
A system using satellite radio access technology (sat RAT) triangulates the location of UEs by measuring the uplink signal timing from a single satellite, leveraging satellite orbital dynamics and ground station processing to determine UE location without relying on GPS, achieving sub-meter accuracy in a few seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS or Wi-Fi is used for location determination, then location accuracy is improved, but device complexity and dependency on additional hardware increase
Solution Approach 1:
The patent extracts the location determination function from the UE and places it in the network side. The ground station processing device calculates UE location using uplink signal timing information and satellite ephemeris data, eliminating the need for GPS or Wi-Fi hardware in the UE while maintaining location accuracy.
Solution Approach 2:
The patent introduces a ground station processing device as an intermediary between the satellite and UE. This intermediary performs the location calculation by processing uplink signal timing information and combining it with satellite position data to determine UE location without requiring the UE to have location capabilities.
2Adaptability or versatility
If satellite-based location tracking is implemented, then location services are provided without GPS, but measurement precision requirements increase
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and storing satellite ephemeris data and orbital parameters in the ground station processing device before location determination is needed. This allows the system to quickly and accurately determine UE location using uplink signal timing without requiring complex real-time satellite tracking capabilities.
3Loss of time
If rapid location fixing is achieved, then response time is improved, but processing complexity increases
Solution Approach 1:
The patent replaces complex mechanical GPS receiver hardware with a software-based location calculation system. The ground station processing device uses signal processing and mathematical calculations based on uplink timing information and satellite ephemeris to rapidly determine location, achieving fast location fixes without the hardware complexity of GPS receivers.
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 system accurately determines UE location in real-time, even without GPS, using satellite orbital dynamics and ground station processing, providing rapid and precise location fixes for emergency and tracking services.
Implementation Method 1
The ground station processing device determines a first pathlength between the UE and the satellite when the satellite is at a first position, and a second pathlength between the UE and the satellite when the satellite is at a second position
Implementation Method 2
The ground station processing device triangulates an actual position of the UE based on the first pathlength and the second pathlength
Data Source
AI summary
A ground station determines a location of a user equipment (UE) by triangulating signals from a single satellite at different times and positions as it orbits the earth. The ground station processing device determines a first pathlength between the UE and the satellite when the satellite is at a first position, and a second pathlength between the UE and the satellite when the satellite is at a second position. The ground station processing device triangulates an actual position of the UE based on the first pathlength and the second pathlength.