Object Detection Wave Coding for Short- and Long-Range Coverage
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Solution Overview
Problem
Existing object detection devices face challenges in reducing detection periods for both short and long-distance ranges while maintaining a simple device configuration and avoiding detection gaps due to reverberation in transducers.
Innovation Solution
The device employs a drive signal generation unit to generate drive signals for a transmitter that outputs first and second search waves with different encoding schemes at alternating timings, allowing for simultaneous detection in both short and long-distance ranges using a single transducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transducer is used to detect objects at both short and long distances, then device complexity is reduced, but detection gaps occur due to reverberation in the transducer
Solution Approach 1:
The patent applies periodic action by alternately switching between two different search wave encoding schemes (first encoding and second encoding) at regular time intervals. This periodic switching allows the system to detect objects at different distances by selecting appropriate encoding types, thereby eliminating detection gaps caused by transducer reverberation while maintaining a simple single-transducer configuration
Solution Approach 2:
The patent changes the encoding parameter of the search wave to resolve the contradiction. By switching between first encoding and second encoding schemes with different characteristics, the system can optimize detection for different distance ranges using the same transducer, avoiding detection gaps without increasing device complexity
2Length of stationary object
If transmission intervals are extended to detect long-distance objects, then detection range is improved, but detection frequency decreases
Solution Approach 1:
The system uses periodic action with multiple encoding types transmitted at different time intervals. Short-distance detection uses one encoding scheme with shorter intervals for high detection frequency, while long-distance detection uses another encoding scheme with longer intervals for extended range, thus resolving the contradiction between detection range and detection frequency
Solution Approach 2:
The patent segments the detection range into different zones (short-distance and long-distance) and assigns different encoding schemes to each zone. This segmentation allows the system to optimize detection parameters for each distance range independently, achieving both extended detection range and maintained detection frequency through appropriate encoding selection
3Measurement precision
If multiple search waves with different encoding schemes are transmitted, then detection accuracy is improved, but transmission timing complexity increases
Solution Approach 1:
The control unit automatically manages the transmission timing of multiple encoding schemes based on detected object distance. The system self-adjusts which encoding type to transmit next without requiring complex external timing control, thereby improving detection accuracy while keeping the control mechanism relatively simple through automated decision-making
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 enables faster object detection with reduced undetectable zones, enhancing detection frequency and accuracy without increasing device complexity.
Implementation Method 1
a transmitter for externally transmitting search waves
Implementation Method 2
receive the reflected waves from the object to which the search wave has been transmitted
Implementation Method 3
a drive signal generation unit that generates a drive signal for driving the transmitter
Data Source
AI summary
An object detection device includes a drive signal generation unit provided to generate a drive signal for driving a transmitter configured to transmit a search wave to the outside, and a control unit provided to control output of the drive signal from the drive signal generation unit to the transmitter. The drive signal generation unit generates a first drive signal corresponding to a first search wave and a second drive signal corresponding to a second search wave having an encoding scheme that is different from the encoding scheme of the first search wave. The control unit causes the drive signal generation unit to output the first drive signal and the second drive signal to the transmitter at different timings so that one of the first and second search waves is transmitted in a transmission interval between transmissions of the other search wave.