Dual-Polarized Receiver for Accurate Field Entry and Exit Detection
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Solution Overview
Problem
Current indoor positioning systems face reduced accuracy and increased costs due to interference from factors like multi-path reflections, leading to errors in personnel management and positioning.
Innovation Solution
A method and device using a single receiver with dual-polarized antennas to determine the signal strength indication (RSSI) and orientation information, such as phase differences and angles of arrival (AoA), to accurately detect people entering and leaving a field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receivers or complex antenna arrays are used to improve positioning accuracy, then measurement precision improves, but device complexity and hardware costs increase
Solution Approach 1:
The patent transitions from horizontal antenna array configuration to vertical antenna configuration. By placing antennas vertically above the entrance, the system achieves accurate entry/exit detection using signal strength variations and phase differences in the vertical dimension, eliminating the need for complex horizontal arrays while maintaining measurement precision.
Solution Approach 2:
The receiver system performs multiple functions: it detects both the presence of people at the entrance and determines their movement direction (entering or leaving). By using dual-polarized antennas that can receive signals from multiple orientations, a single receiver accomplishes what would traditionally require multiple specialized sensors, reducing system complexity while improving measurement capability.
2Measurement precision
If multiple receivers are deployed to accurately detect entry and exit, then measurement precision improves, but hardware costs and installation complexity increase
Solution Approach 1:
The patent combines multiple detection functions into a single receiver unit. By integrating dual-polarized antennas and implementing signal processing algorithms that analyze both signal strength and phase differences, one receiver performs the work of what would traditionally require multiple separate detection devices, reducing hardware quantity while maintaining detection accuracy.
Solution Approach 2:
The system changes the operational parameters of the receiver by using dual-polarized antennas that can detect signals from different orientations. This parameter change allows a single receiver to capture comprehensive spatial information about people's movement, eliminating the need for multiple receivers while maintaining accurate entry/exit detection.
3Reliability
If traditional radio frequency technologies are used, then system coverage is achieved, but measurement precision deteriorates due to multi-path reflections and interference
Solution Approach 1:
The patent converts the harmful effect of multi-path reflections into a beneficial signal characteristic. By using dual-polarized antennas, the system can distinguish between direct line-of-sight signals and reflected signals based on their polarization characteristics and phase relationships. This allows the system to filter out interference while maintaining comprehensive coverage, turning the previously harmful multi-path effect into a discriminable signal feature.
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 reduces hardware construction costs by using a simple system to accurately determine the moving direction and position of individuals, thereby enhancing personnel management and positioning accuracy.
Implementation Method 1
the orientation information includes phase differences of the measurement signals
Implementation Method 2
angles of arrival (AoAs) of the transmitter relative to the receiver
Implementation Method 3
obtaining, by the receiver, a signal strength indication (RSSI) of the transmitter
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, wherein the receiver has a first receiving antenna and a second receiving antenna, and the first receiving antenna and the second receiving antenna are dual-polarized antennas. The method includes obtaining a signal strength indication (RSSI) of the transmitter and orientation information according to the measurement signals by the receiver, wherein the orientation information includes phase differences of the measurement signals and/or angles of arrival (AoAs) of the transmitter relative to the receiver. The method includes receiving, by a main console, the RSSI and the orientation information from the receiver, and determining whether the person passes through or does not pass through the entrance according to a preset number of RSSIs and the orientation information.