Distance Detection Using Signal Correlation Without Tuning Circuit
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Solution Overview
Problem
Existing distance detection and object detection apparatuses require complex circuit configurations to obtain accurate correlation values between transmission and reception waves, complicating the detection process.
Innovation Solution
A distance detection apparatus that includes a wave transmitter, a wave receiver, a storage portion to store the transmission signal, and a correlation processing portion to obtain a correlation value between the transmission and reception signals, allowing for distance detection based on the similarity of these signals without the need for a tuning circuit, simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tuning circuit is provided to obtain an accurate correlation value between transmission and reception waves, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the tuning circuit from the distance detection apparatus while maintaining accurate correlation value calculation. By removing this complex component and using alternative signal processing methods, the invention achieves the desired measurement precision without the associated circuit complexity
Solution Approach 2:
The patent replaces the mechanical/electrical tuning circuit with a signal processing approach that uses correlation calculation between transmission and reception signals. This substitution eliminates the need for physical tuning components while achieving the same functional goal of accurate distance measurement
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 distance detection using a simpler circuit configuration by storing the transmission signal and directly comparing it with the reception signal, eliminating the need for a tuning circuit and enhancing the reliability of the correlation value calculation.
Implementation Method 1
a wave transmitter (311) configured to transmit a transmission wave corresponding to a transmission signal
Implementation Method 2
a wave receiver (321) configured to receive, as a reception wave, the transmission wave which is reflected by an object
Implementation Method 3
a correlation processing portion (324) configured to obtain a correlation value between a transmission signal read from the storage portion (316) and a reception signal corresponding to the reception wave
Implementation Method 4
a detection portion (327) configured to detect a distance from the distance detection apparatus to the object on the basis of a difference between a timing at which the transmission wave is transmitted and a timing at which the reception signal is received
Data Source
AI summary
A distance detection apparatus includes a wave transmitter configured to transmit a transmission wave, a wave receiver configured to receive the transmission wave which is reflected by an object, a storage portion configured to store a transmission signal, a correlation processing portion configured to obtain a correlation value between the transmission signal and a reception signal corresponding to a reception wave, and a detection portion configured to detect a distance to the obstacle in a case where the correlation value indicates that the transmission signal and the reception signal are similar to each other at a level which is equal to or greater than a predetermined level.