Mobile Terminal Indoor-Outdoor Positioning via Direction-Finding Signals
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Solution Overview
Problem
Conventional positioning methods for mobile terminals are prone to errors due to non-line-of-sight transmission and environmental factors, particularly in urban areas where GNSS signals are obstructed, leading to incorrect determination of indoor or outdoor environments.
Innovation Solution
A method involving a multiple-antenna node in an indoor-outdoor critical area that receives and analyzes direction-finding signals to determine location relationship changes, allowing the mobile terminal to switch between indoor and outdoor positioning modes based on azimuth and elevation angle data, ensuring accurate environment detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positioning methods use GNSS satellite signals in urban areas, then positioning can be performed outdoors, but signal obstruction by high buildings causes large errors and incorrect environment determination
Solution Approach 1:
The patent introduces a multiple-antenna node as an intermediary between the mobile terminal and the positioning system. This node receives direction-finding signals from the mobile terminal and provides location relationship information, serving as a mediator that overcomes the limitation of direct GNSS signal reception in obstructed urban environments
Solution Approach 2:
The patent replaces reliance on electromagnetic GNSS satellite signals with a direction-finding signal system using multiple antennas. Instead of depending on satellite signals that are easily blocked, the system uses local direction-finding signals and location relationship changes to determine positioning mode, substituting a more reliable signal mechanism
2Ease of operation
If conventional positioning depends on signal reception, then positioning mode can be selected automatically, but environmental factors and NLOS transmission introduce large errors
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring location relationship changes between the mobile terminal and the multiple-antenna node. The system uses historical location relationship information to determine current positioning mode, creating a feedback loop that improves accuracy by considering temporal changes rather than relying on single-point signal measurements
Solution Approach 2:
The patent performs preliminary actions by collecting N direction-finding signals at N different moments before making the final positioning mode determination. This preliminary data collection and analysis of location relationship changes over time enables more accurate environment determination before selecting the positioning mode
3Adaptability or versatility
If GNSS signal strength is low in urban valleys, then outdoor positioning can still be attempted, but it is easy to erroneously determine indoor environment and switch to indoor positioning mode
Solution Approach 1:
The patent applies dynamics by considering the temporal evolution of location relationship information. Instead of making static environment determination based on single signal strength measurements, the system analyzes changes in location relationships over multiple time moments, enabling dynamic and accurate environment detection that adapts to varying signal conditions in urban valleys
Data Source
AI summary
A mobile terminal control method includes receiving N direction-finding signals that are respectively sent by a multiple-antenna node at N moments, where the multiple-antenna node is located in an indoor-outdoor critical area. The method includes obtaining N pieces of location relationship information between a mobile terminal and the multiple-antenna node at the N moments according to the N direction-finding signals, where the N moments and the N pieces of location relationship information are in a one-to-one correspondence. The method includes determining location relationship change information between the mobile terminal and the multiple-antenna node according to at least M of the N pieces of location relationship information, where 2≤M≤N. The method includes controlling the mobile terminal by matching the location relationship change information and according to the location relationship change information.