Responder Time-Reversal Signaling for Multipath Positioning Accuracy
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Solution Overview
Problem
Existing responders in related art suffer from reception accuracy issues due to multipath interference, where multipath causes the reception waveform to become dull and affects the accuracy of the reception, and the order of the returned signals is not maintained, for example, direct waves are returned earlier than the signal transmitted later, causing the multipath to be transmitted, resulting in inaccurate communication.
Innovation Solution
A responder that includes an antenna, a time-series information converter, and a transmission controller to reverse the order of the stored time-series information, generating a time-reversed wave as the response wave to align the path with the interrogation wave, thereby suppressing multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the responder transmits the response wave while maintaining the order of received signals, then the communication process is simple, but multipath interference causes the reception waveform to become dull and reception accuracy deteriorates
Solution Approach 1:
The patent applies time-reversal inversion to the received signal sequence. Instead of transmitting the response wave in the same order as signal reception, the system reverses the temporal order of signal components before transmission. This inversion causes multipath components to realign constructively at the interrogator, transforming the harmful effect of multipath into a beneficial focusing effect that enhances reception accuracy without significantly increasing system complexity
2Ease of operation
If the responder returns signals in the order they are received, then the system operation is simple, but direct waves may be returned earlier than reflected waves causing signal order disruption and communication accuracy to deteriorate
Solution Approach 1:
The system inverts the temporal sequence of received signal components before transmitting the response wave. This ensures that signal components arrive at the interrogator in the correct chronological order corresponding to their transmission time, preventing the disruption where later-transmitted direct waves return before earlier-transmitted reflected waves. The inversion operation maintains communication reliability while preserving operational simplicity
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
The responder effectively suppresses multipath interference, ensuring accurate communication by aligning the path of the response wave with the interrogation wave, enhancing reception accuracy.
Implementation Method 1
at least one antenna receiving the interrogation wave
Implementation Method 2
a time-series information converter measuring a quadrature phase amplitude of the interrogation wave received by the antenna and converting the quadrature phase amplitude into time-series information
Implementation Method 3
the transmission controller reads out the time-series information in an order reverse to an order of the storage in the memory and generates the response wave
Data Source
AI summary
A responder that receives an interrogation wave from an interrogator and transmits a response wave to the interrogator, includes at least one antenna receiving the interrogation wave, a time-series information converter measuring a quadrature phase amplitude of the interrogation wave received by the antenna and converting the quadrature phase amplitude into time-series information, a memory storing the time-series information, and a transmission controller controlling to transmit the response wave from the antenna based on the time-series information stored in the memory, wherein the transmission controller reads out the time-series information in an order reverse to an order of the storage in the memory and generates the response wave.