Acoustic Indoor Positioning via RF Enhancement
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Solution Overview
Problem
Existing acoustic positioning systems face challenges in achieving wide-area coverage, accuracy, and reliability due to limited acoustic bandwidth, slow signal propagation, and interference in complex indoor environments, making it difficult to meet large-scale multi-area indoor positioning requirements.
Innovation Solution
A method for wide-area acoustic indoor positioning based on RF enhancement, which involves designing an acoustic signal, hybrid multiple access transmission, acoustic measurement using RF enhancement, and robust fusion positioning with inertial sensors and multi-source measurements, including TOA estimation and area identification using Bluetooth RSS, to overcome bandwidth limitations and environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic positioning technology is used for indoor positioning, then positioning accuracy and compatibility are improved, but coverage area is limited due to slow signal propagation speed
Solution Approach 1:
The patent combines acoustic positioning technology with RF (Radio Frequency) enhancement to create a hybrid positioning system. The RF component provides fast signal propagation for wide-area coverage while the acoustic component delivers high-precision positioning measurements, resolving the contradiction between coverage area and positioning accuracy.
Solution Approach 2:
The patent introduces RF signals as an intermediary to assist acoustic positioning. The RF component acts as a mediator that provides initial position estimates and helps track acoustic signals across wide areas, enabling the acoustic system to achieve both wide coverage and high precision simultaneously.
2Adaptability or versatility
If acoustic signals are transmitted in complex indoor environments, then positioning functionality is achieved, but measurement accuracy deteriorates due to multipath interference
Solution Approach 1:
The patent uses RF signals as an intermediary to assist in tracking and identifying acoustic signals in complex environments. The RF component provides robust signal tracking that is less susceptible to multipath interference, helping the acoustic system maintain measurement accuracy in challenging indoor environments.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously refines its position estimates using both acoustic and RF measurements. This feedback loop allows the system to adapt to environmental conditions and compensate for multipath interference, maintaining accuracy in complex indoor settings.
3Area of stationary object
If more acoustic signals are transmitted to cover wide areas, then coverage is improved, but signal identification becomes difficult due to limited bandwidth
Solution Approach 1:
The patent merges acoustic positioning with RF enhancement to solve the bandwidth limitation problem. The RF component provides additional measurement channels that are not constrained by acoustic bandwidth limits, enabling the system to track multiple users and signals simultaneously across wide areas without signal identification difficulties.
4Adaptability or versatility
If acoustic positioning is implemented without hardware changes, then compatibility and cost are improved, but positioning accuracy deteriorates in large-scale environments
Solution Approach 1:
The patent leverages the universality of existing smartphone hardware by using both the microphone (for acoustic signals) and RF components (for radio frequency signals) that are already present in modern smartphones. This multi-functional approach enables accurate large-scale positioning without requiring any hardware modifications, as the system uses existing sensors for dual purposes.
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 solution enables accurate and scalable wide-area acoustic positioning, achieving sub-meter accuracy and reliable coverage in complex indoor environments without requiring changes to existing smartphone hardware, making it suitable for large-scale applications like exhibition centers and transportation hubs.
Implementation Method 1
acoustic positioning technology is a positioning technology for calculating the distance between the transmitter and the receiver by measuring the acoustic propagation time
Implementation Method 2
acoustic measurement based on RF enhancement
Implementation Method 3
area identification based on low-power Bluetooth RSS
Data Source
AI summary
The present disclosure belongs to technical field of indoor positioning, and discloses a method and system for wide-area acoustic indoor positioning based on RF enhancement, comprising: design of an acoustic signal, using Blackman window function to control the amplitude of acoustic signal entering and leaving channel; a mixed multiple access transmission of the acoustic signal, combining three multiple access schemes of time, space and frequency, assisting a small amount of BLE signals, and constructing a wide-area coverage capability of the acoustic positioning signal; acoustic measurement based on RF enhancement, including TOA estimation of an acoustic signal and area identification based on low-power Bluetooth RSS; robust fusion positioning of an inertial sensor and multi-source measurement, including pedestrian walking speed estimation, multi-source heterogeneous measurement, acoustic measurement compensation and correction, measurement quality evaluation and control.