Dual Transmitter Radar Constructive Interference Disturbance

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Solution Overview

Problem

Existing radar apparatuses are vulnerable to disturbances and fail to accurately detect changes in measurement targets due to reduced reception amounts of reflection waves.

Innovation Solution

A radar apparatus with two transmitter antennas and a receiver antenna, where the first and second electric waves with the same frequency are transmitted from different positions, causing constructive interference near the measurement target, and the receiver antenna outputs a reception signal affected by this interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a radar apparatus uses a single transmitter antenna to irradiate a measurement target, then the device complexity is low, but the reception amount of the reflection wave is reduced under disturbance, resulting in poor measurement precision

Engineering Contradiction:

Improvedetection accuracy of change in measurement targetVSAvoidnumber of transmitter antennas

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The transmitter is segmented into multiple transmitter antennas (first transmitter antenna and second transmitter antenna) positioned at different locations. Each antenna transmits electric waves that interfere constructively at the measurement target, enhancing the reflection wave strength and improving detection accuracy under disturbance conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple electric waves from different transmitter antennas are merged through constructive interference at the measurement target. This combining effect amplifies the interaction between the transmitted waves and the measurement target, resulting in a stronger reflection wave that improves measurement precision.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If the transmitter antenna is positioned to maximize reception of reflection wave, then the measurement precision is improved, but the system becomes vulnerable to disturbance causing reduced reception amount

Engineering Contradiction:

Improvedetection accuracy of change in measurement targetVSAvoidstability of reception amount under disturbance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent creates a localized region of constructive interference between multiple electric waves at the measurement target. This local enhancement of wave interaction ensures that the reflection wave strength is maximized specifically at the measurement point, improving both precision and reliability by making the measurement less sensitive to general positional disturbances.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The transmitter antennas are pre-positioned and configured to produce constructive interference patterns before measurement begins. This preliminary arrangement ensures that the electric waves will consistently reinforce each other at the measurement target regardless of minor disturbances during the measurement process, maintaining stable reception amounts.

Inventive Principle:

Principle #10Preliminary action

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

This configuration allows the radar to stably output a Doppler signal corresponding to the change in the measurement target, even under disturbances, enabling high-accuracy detection of changes.

Implementation Method 1

a first transmitter antenna configured to transmit a first electric wave having a predetermined frequency to a measurement part of an object; a second transmitter antenna configured to transmit a second electric wave having the same frequency as the frequency of the first electric wave to the measurement part from a position different from a position of the first transmitter antenna; a receiver antenna configured to receive the first electric wave and the second electric wave which a constructive interference occurs between

Methodology Applied

Scientific EffectConstructive interference: Interference

Implementation Method 2

An existing typical radar apparatus irradiates a measurement target with an electric wave and detects a change (forinstance, a state of vibration or a displacement) in a measurement target by using a Doppler shift of a reflection wave reflected by the measurement target

Methodology Applied

Scientific EffectDoppler shift: Doppler Effect

Data Source

PatentUS12235343B2Radar apparatus

Publication Date: 2025.02.25 NAGAO YOSHIMITSU

AI summary

A radar apparatus includes: a first transmitter antenna that transmits a first electric wave having a predetermined frequency to a measurement part of an object; a second transmitter antenna that transmits a second electric wave having the same frequency as the frequency of the first electric wave to the measurement part from a position different from that of the first transmitter antenna; a receiver antenna that receives the first electric wave and the second electric wave which a constructive interference occurs between and are reflected by the measurement part, and output a reception signal; and a radar that outputs a Doppler signal according to a change in the measurement part on the basis of the reception signal, and the first transmitter antenna and the second transmitter antenna are adjusted to respective locations where the constructive interference occurs between the first electric wave and the second electric wave.