Transmission Array Sweep Timing for Adjustable Target Detection Angle
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Solution Overview
Problem
Conventional target detection devices with finite bandwidths face challenges in easily adjusting their searchable angular range, requiring hardware changes that are not straightforward to implement.
Innovation Solution
A target detection device and method that control the sweep time of transmission signals to adjust the searchable angular range, allowing for easy adjustment without hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bandwidth of the transmission wave is increased to widen the searchable angular range, then the angular range is improved, but the distance resolution deteriorates due to the finite bandwidth constraint
Solution Approach 1:
The patent applies dynamics by making the transmission source movable. A transmission element is moved in one direction to change the frequency of the transmission wave transmitted into water. This movement creates a Doppler effect that varies the frequency across different angular directions, allowing the system to achieve a wider searchable angular range without requiring a larger bandwidth, thereby maintaining distance resolution while expanding angular coverage.
Solution Approach 2:
The patent changes the frequency parameter of the transmission wave by moving the transmission source. As the transmission element moves, the frequency of the transmitted wave changes according to the Doppler effect, with different frequencies corresponding to different angular directions. This parameter change approach allows the system to cover a wider angular range using a finite bandwidth, resolving the contradiction between angular range and distance resolution.
2Area of stationary object
If hardware changes are made to adjust the searchable angular range, then the angular range is improved, but the device complexity and ease of manufacture worsen
Solution Approach 1:
Instead of changing hardware configuration to adjust the angular range, the patent uses a movable transmission element that can be dynamically positioned. This allows the searchable angular range to be adjusted by controlling the movement of the transmission element, rather than requiring hardware reconfiguration. The system achieves adaptability through motion control, improving ease of manufacture and adjustment while maintaining the ability to change the angular range.
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 flexible adjustment of the searchable angular range by controlling sweep time, balancing angular range and distance resolution according to user preferences.
Implementation Method 1
A transmission element (e.g., ultrasonic oscillator) is moved in one direction to change a frequency of a transmission wave transmitted into water
Implementation Method 2
detecting a target based on a reflected wave
Data Source
AI summary
A target detection device including a transmission signal generator, a transmission array, a switch, and a controller is disclosed. The transmission signal generator is configured to generate a transmission signal. The transmission array including a plurality of transmission elements is configured to convert the transmission signal into a transmission wave. The transmission array includes at least a start transmission element and an end transmission element. The switch is configured to supply the transmission signal to the plurality of transmission elements sequentially from the start transmission element to the end transmission element. The controller is configured to control a sweep time of the switch. The sweep time is a time from the supply of the transmission signal to the start transmission element to the supply of the transmission signal to the end transmission element.