RSSI-Based Target Location Inference via Geometric Distance
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Solution Overview
Problem
Existing methods for inferring the location of a target using signal similarity are unreliable due to variations in signal strength caused by reception environments.
Innovation Solution
A target location inference apparatus that measures the strength of radio signals from transmitters on targets and reference objects, calculates distances using these signal strengths, and infers the target's presence range based on geometric relationships between these distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If signal similarity method is used to infer target location, then the system can operate with simple signal comparison, but the inference reliability deteriorates due to signal strength variations from reception environments
Solution Approach 1:
The patent changes the measurement parameter from signal similarity to received signal strength indicator (RSSI). By measuring the actual signal strength values from transmitters and using these quantitative parameters to calculate distances, the system achieves more reliable location inference that is not affected by environmental variations in signal characteristics
Solution Approach 2:
The patent replaces the signal processing approach (comparing signal waveforms for similarity) with a physics-based approach (using signal strength to infer distance through geometric relationships). This substitution uses the fundamental relationship between signal strength and distance to achieve more reliable location inference
2Measurement precision
If received signal strength is used to calculate distance, then the distance calculation accuracy improves within predetermined accuracy range, but the system requires multiple transmitters and geometric relationship calculations
Solution Approach 1:
The patent divides the location inference problem into separate distance calculations for each transmitter-receiver pair. By calculating individual distances from multiple transmitters to the receiver and then combining these through geometric relationships, the system achieves accurate target location inference while maintaining modular, independent measurement processes
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 more reliable inference of the target's presence range with improved accuracy and reliability, even in challenging environmental conditions.
Implementation Method 1
a receiving section that receives a first radio signal from a first transmitter disposed on a target and a second radio signal from a second transmitter disposed in a reference location and measures the strength of a received radio signal
Data Source
AI summary
A target location inference apparatus includes a receiving section and an operation section. The receiving section receives a first radio signal from a first transmitter disposed on a target and a second radio signal from a second transmitter disposed in a reference location. The operation section infers a target presence range in which the target is present with respect to the reference location. The target presence range is inferred based on a first received radio signal strength, in the receiving section, of the first radio signal and a second received radio signal strength, in the receiving section, of the second radio signal.