Cooperating Nodes Geolocation Using Wireless Signal Measurements
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Solution Overview
Problem
Current geolocation methods rely on passive reference transmitters and lack efficient means to determine the position of a target node in cooperative relay networks, especially in dynamic environments where precise localization is required without computational means at the reference transmitters.
Innovation Solution
A method and device utilizing a group of cooperating nodes to determine the position of a target node by calculating distances and directions from wireless signal measurements, employing a common reference position and iterative algorithms to refine the target node's position with low complexity and improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive reference transmitters are used for geolocation, then the system complexity is reduced, but the measurement precision and adaptability in dynamic environments deteriorate
Solution Approach 1:
Cooperating nodes perform self-localization by computing their positions using wireless signal measurements exchanged among themselves, eliminating the need for external passive reference transmitters. Each node actively participates in the localization process, computing distances based on signal propagation time and determining its position relative to other nodes in the network.
Solution Approach 2:
The system transitions from static passive reference transmitters to dynamic cooperating nodes that can move and adapt their positions. The network maintains localization capability in dynamic environments where nodes may change positions, as each node continuously computes its position based on current signal measurements from other cooperating nodes.
2Adaptability or versatility
If cooperative relay networks are used for target positioning, then the adaptability in dynamic environments is improved, but the device complexity increases
Solution Approach 1:
The localization function is segmented and distributed across multiple cooperating nodes rather than concentrated in a single complex system. Each node performs localized computations using measurements from its neighbors, dividing the overall computational task into smaller, manageable segments that can be executed independently by each node.
Solution Approach 2:
Wireless signal measurements serve as intermediaries that carry position information between cooperating nodes. Nodes exchange signal propagation time data, which acts as a mediator to convey spatial relationship information without requiring direct computational coordination or complex communication protocols.
3Productivity
If distributed computation is used among cooperating nodes, then the productivity and efficiency of geolocation are improved, but the measurement and detection difficulty increases
Solution Approach 1:
Multiple wireless signal measurements from different cooperating nodes are merged to compute the position of the target node. The system combines distance measurements from multiple sources to determine the target's location, merging redundant information to improve accuracy and efficiency while managing measurement complexity through aggregation.
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
Enables accurate and efficient geolocation of a target node in various applications, including moving devices and stationary objects, by leveraging wireless signal measurements and distributed computation, enhancing precision and adaptability in dynamic scenarios.
Implementation Method 1
the position of the target node is determined by determining a first estimate of the position of the target node using the determined distances, optimizing the first estimate using the determined direction, and determining the position of the target node using the optimized first estimate
Implementation Method 2
each cooperating node measures the reception time of messages broadcasted by the target node in order to determine a distance with the target node
Data Source
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AI summary
The present invention concerns a method for determining, by at least a cooperating node of a group of cooperating nodes, a position of a target node. The method comprises the steps of: - determining the position of other cooperating nodes, - determining the position of a common reference position for the cooperating nodes, - obtaining information related to measurements on wireless signals exchanged between the target node and the cooperating nodes, - determining, from the obtained information, an information representative of the distance between the target node and said common reference position or representative of the direction of the target node relative to the common reference, - determining, from information related to measurements and from the information representative of the distance between the target node and said common reference position or representative of the direction of the target node relative to the common reference, the position of the target node.