Indoor Wi-Fi Positioning Using Radio Signal Flight Time Comparison
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Solution Overview
Problem
Existing Wi-Fi indoor positioning systems face inaccuracies due to unstable signal intensity and multipath measurement errors, leading to inconvenient user experiences.
Innovation Solution
A method involving a client sending position requests to multiple access points, receiving and comparing radio signal flight times to determine accurate positioning coordinates by calculating the minimum time difference with pre-measured sampling times, enhancing user convenience and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Wi-Fi access points are used for indoor positioning, then positioning coverage is expanded, but positioning accuracy deteriorates due to unstable signal intensity and multipath measurement errors
Solution Approach 1:
The patent performs preliminary actions by measuring and storing radio signal flight times between access points and multiple sampling points in advance before actual positioning occurs. This pre-measured data is stored in a database, allowing the system to compare actual measurements against known reference values during positioning operations, thereby improving accuracy without expanding coverage
Solution Approach 2:
The patent implements feedback by comparing the radio signal flight time measured during actual positioning with the pre-stored sampling time data from the database. The system calculates time differences and uses this feedback information to determine the client's position, correcting for measurement errors caused by multipath and wall penetration effects
2Ease of operation
If radio signal flight time measurement is performed, then positioning capability is enabled, but measurement error increases due to multipath and wall penetration
Solution Approach 1:
The patent introduces an intermediary approach by using pre-measured sampling time data as a reference mediator. Instead of relying solely on direct radio signal measurements that are prone to multipath errors, the system uses the stored sampling time information as a benchmark to evaluate and correct actual measurements, thereby reducing measurement error while maintaining positioning capability
Solution Approach 2:
The patent substitutes the direct mechanical measurement approach with a comparative calculation approach. Rather than relying purely on raw radio signal flight time measurements that are susceptible to multipath errors, the system replaces this with a computational method that compares measured times against pre-stored reference data, thereby reducing the impact of measurement errors
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
This solution enables accurate client positioning by comparing radio signal flight times with pre-measured sampling times, improving user convenience and reducing positioning errors.
Implementation Method 1
sending, by the client, a corresponding measurement report message to each access point, so that each access point obtains a radio signal flight time between itself and the client
Data Source
AI summary
An indoor positioning method includes: sending, by a client, a position request instruction to at least three access points; receiving, by the client, a response message sent by each access point in response to the request instruction; sending, by the client, a corresponding measurement report message to each access point, so that each access point obtains a radio signal flight time between itself and the client; and receiving, by the client, a position estimation result from a network side, where the network side performs a comparative calculation on the radio signal flight time received from each access point and a sampling time measured in advance between each access point and each of multiple sampling points, and the position estimation result is an obtained coordinate location of a sampling point whose corresponding sampling time has a minimum time difference from the radio signal flight time received from each access point.