Single-Receiver Entry Detection Using RSSI and AoA Positioning
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Solution Overview
Problem
Current indoor positioning systems face reduced accuracy and increased costs due to interference and complexity, leading to errors in personnel management and positioning.
Innovation Solution
A method and device using a single receiver to determine the moving direction and position of a person by analyzing signal strength indication (RSSI) and phase information, calculating arrival angle (AoA), and determining entry or exit based on positional data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receivers or complex radio frequency technologies are used to improve positioning accuracy, then measurement precision improves, but device complexity and installation costs increase
Solution Approach 1:
The system divides the positioning function into two parts: a simple single receiver at the entrance for detection, and a transmitter on the person carrying identification information. This segmentation allows accurate entry/exit detection without requiring complex multi-receiver infrastructure throughout the space.
Solution Approach 2:
The patent introduces a wireless transmitter as an intermediary device carried by the person, which communicates with the fixed receiver. This mediator enables accurate positioning and entry/exit detection through wireless signals, avoiding the need for complex physical infrastructure or multiple receivers.
2Measurement precision
If multiple receivers are deployed to accurately detect entry and exit, then measurement precision improves, but manufacturing and installation costs increase
Solution Approach 1:
The system segments the detection function to a single strategic receiver positioned at the entrance rather than deploying multiple receivers throughout the space. This single receiver, combined with the transmitter on the person, achieves accurate entry/exit detection while minimizing hardware quantity and installation cost.
Solution Approach 2:
The single receiver performs multiple functions: detecting the presence of the transmitter, determining entry/exit events, and providing positioning information. This multi-functionality eliminates the need for multiple specialized receivers, reducing both manufacturing and installation costs.
3Measurement precision
If complex positioning systems are implemented, then measurement precision improves, but system maintenance costs increase
Solution Approach 1:
The system separates the permanent infrastructure (single receiver) from the portable component (transmitter on person). This segmentation simplifies maintenance: the fixed receiver requires minimal maintenance, and the portable transmitter can be easily replaced or recharged, reducing overall system maintenance complexity and cost.
Solution Approach 2:
The transmitter on the person serves as a self-contained unit with its own power source and identification information, requiring no external infrastructure for maintenance. This self-service capability reduces the maintenance burden on the fixed receiver system.
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
Accurately detects entry and exit with reduced hardware costs by utilizing a single receiver to analyze RSSI and AoA, enhancing system precision and reducing installation and maintenance expenses.
Implementation Method 1
obtaining an arrival angle (AoA) of the transmitter relative to the receiver based on the phase information
Implementation Method 2
obtains a signal strength indication (RSSI) of the transmitter and phase information of the transmitter according to the measurement signals by the receiver
Data Source
AI summary
A method for detecting people entering and leaving a field is provided. The method includes receiving, by a receiver arranged above an entrance, measurement signals transmitted by a transmitter equipped on a person. The method includes obtaining a signal strength indication (RSSI) of the transmitter and phase information of the transmitter according to the measurement signals by the receiver. The method includes receiving the RSSI and the phase information from the receiver by a main console, obtaining an arrival angle (AoA) of the transmitter relative to the receiver based on the phase information, and obtaining a position of the person based on the RSSI and the AoA. The method includes determining whether the person passes through or does not pass through the entrance according to all positions obtained within a time interval by the main console.