Ultrasonic Underwater Detector Voltage Envelope Control
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Solution Overview
Problem
Existing underwater detectors using pulse-width modulation for envelope control of ultrasonic signals face limitations in achieving sufficient envelope width due to response speed constraints, leading to spurious signals and high range side lobe levels when employing the pulse compression technique.
Innovation Solution
The implementation of a voltage control circuit that adjusts the voltage supplied to the switching circuit, allowing for a constant and varied pulse width of the reference signal, combined with a gate signal generating module that changes the rising edge cycle, enables the transmission of ultrasonic signals with a larger controlled envelope width, thereby suppressing spurious signals and reducing range side lobe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If pulse-width modulation is used for envelope control, then the envelope width can be controlled, but the response speed limit of switching components prevents sufficient envelope width control
Solution Approach 1:
The patent replaces the mechanical switching control method (PWM using FETs) with a voltage control method. Instead of using switching components with inherent response speed limits, the invention applies voltage control to the power source, which has no such response limitations. This substitution enables sufficient envelope width control that was previously unachievable with switching-based methods.
Solution Approach 2:
The patent changes the control parameter from pulse width modulation (time-based) to voltage control (amplitude-based). By controlling the voltage applied to the power source rather than the pulse width of switching signals, the system achieves envelope control without being constrained by the response speed of switching components, thereby enabling larger envelope widths.
2Reliability
If the pulse width is limited by response time, then switching can be controlled, but the envelope controlled width becomes insufficient leading to spurious signals
Solution Approach 1:
The patent replaces the switching-based envelope control mechanism with a voltage control mechanism. This substitution eliminates the response time limitations that constrain envelope width, thereby enabling sufficient envelope controlled width that suppresses spurious signals without being limited by switching response characteristics.
3Measurement precision
If pulse-width modulation is used, then envelope control is achieved, but range side lobe levels remain high when using pulse compression technique
Solution Approach 1:
The patent changes the envelope control parameter from time-based pulse width modulation to voltage-based control. This parameter change enables generation of envelope shapes that are optimized for pulse compression techniques, thereby reducing range side lobe levels while maintaining or improving distance resolution through better envelope control.
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 approach allows for the suppression of spurious signals and reduction of range side lobe levels, enhancing the detection capabilities by enabling a larger controlled envelope width and improved distance resolution using the pulse compression technique.
Implementation Method 1
a voltage control circuit for controlling the voltage supplied to a switching circuit
Implementation Method 2
a transducer for transmitting an ultrasonic signal underwater by being applied with the reference signal
Data Source
AI summary
The present disclosure provides an underwater detector including a power source for applying a predetermined voltage, a voltage control circuit for controlling the voltage based on a control signal, a gate signal generating module for outputting a gate signal, a switching circuit for outputting a reference signal based on the voltage controlled by the voltage control circuit and the gate signal outputted from the gate signal generating module, and a transducer for transmitting an ultrasonic signal underwater, an envelope of which being controlled based on a waveform of the control signal by being applied with the reference signal.