Target Direction Estimation Using Amplitude-Corrected Phase Difference
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Solution Overview
Problem
Existing methods for estimating the arrival angle of radio waves are inaccurate when there are disturbances, such as reflected waves from unintended objects, leading to incorrect target location estimation.
Innovation Solution
A method and device that corrects the phase difference between received radio waves using amplitude ratios and differences to reduce disturbances, allowing accurate estimation of target direction even with disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase difference between received radio waves is used to estimate arrival angle, then estimation can be performed, but measurement precision deteriorates when disturbances such as reflected waves from unintended objects are present
Solution Approach 1:
The patent extracts and removes the harmful reflected radio waves from the received signal by calculating the phase difference between direct waves and reflected waves separately, then subtracting the reflected wave component from the total received signal to isolate the direct wave for accurate arrival angle estimation
Solution Approach 2:
The patent introduces an intermediary calculation process that uses the phase difference between signals received by multiple antennas to identify and separate the reflected wave component, which then serves as a mediator to clean the received signal before arrival angle estimation
2Reliability
If reflected radio waves from unintended objects are included in received signals, then signal reception is maintained, but target location estimation accuracy deteriorates
Solution Approach 1:
The patent converts the harmful reflected waves into a beneficial component by using their phase difference characteristics to identify and quantify the interference, then utilizing this information to subtract the reflected wave component and recover the direct wave signal for accurate target location estimation
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 method and device enable precise estimation of target direction by correcting phase differences, ensuring accurate arrival angle calculation despite disturbances in the received radio waves.
Implementation Method 1
calculating a phase difference between first received radio waves that are radio waves received by the first antenna in the receiving and second received radio waves that are radio waves received by the second antenna in the receiving
Data Source
AI summary
An estimation method includes: receiving, by first and second antennas, radio waves including reflected radio waves that are radio waves transmitted from a transmitting antenna and reflected by a target; calculating a phase difference between first received radio waves that are radio waves received by the first antenna in the receiving and second received radio waves that are radio waves received by the second antenna in the receiving; calculating an amount of correction based on the amplitude of the first received radio waves and the amplitude of the second received radio waves, adding the calculated amount of correction to the phase difference calculated in the calculating of the phase difference, and obtaining a corrected phase difference resulting from correction of the phase difference; and estimating, based on the corrected phase difference and the distance between the first and second antennas, a direction in which the target is located.