Confined-Space Radio Localization Without RSSI Fingerprinting
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Solution Overview
Problem
Existing localization systems in confined environments suffer from signal noise due to multipath fading and require costly preliminary mapping and fingerprinting steps, leading to inefficiencies in accuracy and scalability.
Innovation Solution
A method using a localization infrastructure with transmitters and receivers, combined with signal filtering and multilateration techniques, including singular value decomposition and denoising autoencoders, to determine the position of mobile devices and objects by minimizing noise and eliminating the need for environmental mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerprinting technique is used for localization, then localization accuracy can be achieved, but preliminary mapping step is required which increases installation time and complexity
Solution Approach 1:
The patent applies preliminary action by pre-positioning transmitters at known locations in the environment before localization is needed. These transmitters broadcast identification signals that enable receivers to determine positions without requiring time-consuming preliminary mapping or fingerprinting processes. The transmitters are installed in predetermined locations with known coordinates, allowing immediate use for localization purposes.
2Reliability
If multiple propagation paths are present in confined environments, then signal coverage can be improved, but signal noise and multipath fading increase which deteriorates localization accuracy
Solution Approach 1:
The patent converts the harmful effect of multipath fading into a beneficial feature by using the received signal strength (RSSI) values from multiple propagation paths as input data for localization. Instead of trying to eliminate multipath effects, the system utilizes the signal strength information from these paths to calculate positions through trilateration, transforming the noise problem into a useful measurement approach.
Solution Approach 2:
The patent introduces an intermediary processing layer between signal reception and position calculation. The system collects RSSI values from multiple transmitters and uses these as intermediate data to compute distances and positions. This intermediary approach allows the system to work with the actual measured signal strengths despite multipath fading, rather than requiring perfect signal conditions.
3Ease of operation
If traditional localization systems are deployed, then localization function can be provided, but hardware complexity and installation costs increase
Solution Approach 1:
The patent employs inexpensive transmitters that can be easily deployed and removed, replacing complex and costly localization hardware. These simple transmitters broadcast identification signals and can be positioned at known locations without requiring sophisticated equipment. The system uses basic receivers that can detect signal strength, avoiding the need for expensive specialized localization devices.
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 approach enhances accuracy and scalability while reducing installation time and costs, minimizing energy consumption, and maintaining simplicity in hardware complexity.
Implementation Method 1
a plurality of electromagnetic signal transmitters installed in predetermined locations in the environment, the transmitters being each adapted to periodically broadcast a respective electromagnetic identification signal capable of being detected by the receiving means
Implementation Method 2
receiving means of the mobile radio communication device, arranged to determine a plurality of identification data indicative of a strength of the received identification signal
Data Source
AI summary
Methods are provided for locating a mobile radio communication device with a receiver detecting electromagnetic identification signals broadcast by transmitters in a confined environment, or an object with a transmitter periodically broadcasting an electromagnetic identification signal detectable by a plurality of receivers of a localization infrastructure. The receiver of the mobile radiocommunication device, or the plurality of receivers of the localization infrastructure, determine identification data indicative of strength of received identification signals, forming an identification data matrix which is processed to obtain an identification data matrix with reduced noise, from which a characteristic identification vector is extracted including a characteristic identification data element for each transmitter or receiver. Position coordinates of the mobile radio communication device or of the object are determined by minimizing an error in calculating distances between position of the mobile radio communication device, or of the object, and position of at least three transmitters, respectively receivers.