UWB Differential First-Path Power for Reliable Relative Location
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Solution Overview
Problem
Conventional systems for determining the location of a portable device relative to an object, such as a vehicle, suffer from inaccuracies due to factors like physical boundaries, external objects, and moving aspects, which affect the reliability of location estimation.
Innovation Solution
A system utilizing ultra-wideband (UWB) communication protocols between fixed devices positioned relative to the object and the portable device to determine differential first path power, enabling precise location estimation by calculating the difference in power characteristics between these devices, thereby minimizing the impact of variations in portable device antenna gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional systems use signal strength measurement with directional antenna to determine relative distance and position, then the system can establish basic location capability, but location accuracy deteriorates due to physical boundaries, external objects, and moving aspects
Solution Approach 1:
The system divides the location determination task into multiple independent measurements by using multiple fixed devices at different positions. Each device independently measures signal characteristics, and the controller combines these segmented measurements to determine location, thereby reducing the impact of any single problematic measurement path
Solution Approach 2:
The controller acts as an intermediary that receives raw signal strength measurements from multiple fixed devices and processes them through differential calculation. This intermediary processing step eliminates the need for each individual measurement to be perfectly accurate, as the differential approach cancels out common errors
2Measurement precision
If the system uses multiple fixed devices to improve location accuracy through differential measurement, then location precision improves, but device complexity increases
Solution Approach 1:
Each fixed device performs multiple functions: it serves as both a signal transmitter and a measurement receiver. The same hardware infrastructure supports both the communication protocol and the location determination, eliminating the need for separate dedicated measurement equipment and reducing overall system complexity
Solution Approach 2:
The system merges the communication function and location measurement function into a single integrated process. The ultra-wideband communication signals serve dual purposes: data transmission and location determination, combining what could have been separate systems into one unified approach
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 provides accurate and reliable location information for portable devices relative to objects, unaffected by variations in portable device types, ensuring precise control operations like vehicle access or command.
Implementation Method 1
capable of communicating with the portable device in accordance with an ultra-wideband communication protocol
Data Source
AI summary
Location information of a portable device with respect to an object is determined based on UWB communications and using a first path power. A differential first path power may also be determined based on first and second first path power values obtained respectively by first and second devices via UWB communications with the portable device.