Sonar Signal Multiplexer Frequency-Division Cable
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Solution Overview
Problem
Current sonar systems face challenges in reducing the weight and volume of the immersed part, improving reliability, and increasing the bit rate of communication data transmission due to the limitations of coaxial electric carrier cables used in helicopter-winched sonars.
Innovation Solution
The implementation of signal combination and separation means allows for simultaneous transmission of electrical power supply, emission, and communication data signals over a single electric carrier cable, using specific frequency bands to optimize weight reduction and reliability, eliminating the need for energy storage and active power switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If time-division multiplexing is used to transmit signals over a single coaxial cable, then the cable diameter and mechanical stress are reduced, but the weight and volume of the immersed part increase due to energy storage devices and active power switching elements
Solution Approach 1:
The patent combines multiple signal types (power supply, emission, communication data) into a single transmission medium (coaxial cable) using frequency-division multiplexing. This merging eliminates the need for separate cables and the associated energy storage devices and power switching elements in the immersed part, thereby reducing volume while maintaining reliable signal transmission through frequency-based separation.
Solution Approach 2:
The patent changes the transmission parameter from time-division multiplexing to frequency-division multiplexing. By allocating different frequency bands to different signal types, the system eliminates the need for active power switching elements and energy storage devices, reducing the volume and weight of the immersed part while ensuring continuous and reliable power supply and signal transmission.
2Productivity
If multiple transmission lines are used to increase communication data bit rate, then the communication capacity increases, but the cable diameter and mechanical stress increase
Solution Approach 1:
Instead of increasing the number of transmission lines (spatial dimension), the patent utilizes the frequency dimension to transmit multiple signal types simultaneously over a single cable. This dimensional shift from spatial to spectral domain allows high communication data bit rates without increasing cable diameter or mechanical stress.
Solution Approach 2:
The single coaxial cable is designed to perform multiple functions simultaneously: transmitting power supply signals, emission signals, and communication data. By making the cable multi-functional through frequency-division multiplexing, the system achieves high communication capacity without requiring additional cables, thus avoiding increased diameter and mechanical stress.
3Reliability
If energy storage devices and active power switching elements are added to ensure signal continuity, then the reliability of power supply improves, but the weight and volume of the immersed part increase
Solution Approach 1:
The patent replaces mechanical energy storage devices (batteries, capacitors) and active power switching elements with an electronic frequency-division multiplexing system. By allocating a dedicated low-frequency band for power supply signals, the system ensures continuous power transmission without requiring energy storage devices, thereby eliminating their weight and volume in the immersed part.
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 solution reduces the weight and volume of the sonar, enhances reliability by eliminating electromechanical switching elements, and increases communication data bit rates without increasing the cable's diameter or mechanical stress, enabling more efficient hydrodynamic performance and data processing.
Implementation Method 1
an inductor configured to allow the electrical power supply signal and the signals to be emitted to pass and to restrict the propagation of the signal conveying communication data
Implementation Method 2
a filter configured to allow the signal conveying communication data to pass and to restrict the propagation of the electrical power supply signal and of the signals to be emitted
Implementation Method 3
This part is primarily composed of acoustic transducers allowing the emission and reception of submarine signals
Implementation Method 4
The sonars are devices that use the properties of propagation of sound in water to detect and locate submarine objects
Data Source
AI summary
A sonar includes a first part and a second part linked by an electric carrier cable configured to mechanically support the second part and allow the two parts of the sonar to exchange signals comprising: a unidirectional signal, called electrical power supply signal, unidirectional signals, called signals to be emitted, transmitted by the first part to the second part for them to be transmitted in the form of acoustic waves, and a bidirectional signal conveying communication data, the sonar wherein the first part comprises signal combination means configured for the signals to be transmitted simultaneously over the electric carrier cable, and in that the second part comprises separation means allowing the recovery of each of the signals transmitted over the electric carrier cable.