CN-122026954-A - Ship extension alarm system and method based on direct-current power line carrier communication

CN122026954ACN 122026954 ACN122026954 ACN 122026954ACN-122026954-A

Abstract

The invention discloses a ship extension alarm system and method based on direct current power line carrier communication, wherein the system comprises a central controller and an extension alarm module, the central controller is connected with the extension alarm module through a 24V direct current power line, the central controller is used for receiving an original signal, the original signal is an RS485 signal sent by a cabin monitoring alarm system, the original signal is modulated to obtain an encrypted carrier signal, the encrypted carrier signal is sent to the extension alarm module through the 24V direct current power line, and the extension alarm module is used for receiving the encrypted carrier signal, demodulating and restoring the encrypted carrier signal to obtain alarm information. The system and the method provided by the invention can reduce the cost and simultaneously meet the communication reliability and the signal transmission efficiency.

Inventors

LI JIANHAO
ZHANG BOYONG
WANG TONG
LIU RUIKANG
BI YANMEI
SHI JUN
LI GEN
MA XIANGNING
SU XIANGZHONG
ZHANG YU
YAO CHUNMING

Assignees

中船航海科技有限责任公司

Dates

Publication Date: 20260512
Application Date: 20251104

Claims (8)

1. The ship extension alarm system based on direct current power line carrier communication is characterized by comprising a central controller and an extension alarm module, wherein the central controller is connected with the extension alarm module through a 24V direct current power line; the central controller is used for receiving an original signal, the original signal is an RS485 signal sent by the cabin monitoring alarm system, The central controller is also used for modulating the original signal to obtain an encrypted carrier signal, and transmitting the encrypted carrier signal to the extension alarm module through a 24V direct current power line; The extension alarm module is used for receiving the encrypted carrier signal, demodulating the encrypted carrier signal and recovering the encrypted carrier signal to obtain alarm information.
2. The marine extension warning system based on direct current power line carrier communication according to claim 1, wherein the central controller comprises a first communication unit, a core processing unit, a signal modulation unit, and a second communication unit; the first communication unit is capable of receiving an original signal; The core processing unit can send the original signal to the signal modulation unit; the signal modulation unit can divide an original signal into a plurality of sub-carriers by adopting an OFDM technology, and modulate the sub-carriers by adopting a GMSK technology or a QPSK technology to obtain encrypted carrier signals, wherein the number of the sub-carriers is 256, and the cyclic prefix length of each sub-carrier is 4.8 mu s; the second communication unit is capable of transmitting an encrypted carrier signal to the extended alarm module, the encrypted carrier signal comprising an encrypted alarm signal and an encrypted monitor signal.
3. The marine vessel extension warning system based on direct current power line carrier communication according to claim 2, wherein the signal modulation unit is capable of dynamically adjusting the operating parameters based on real-time probe feedback of the second communication unit to the transmission channel, Wherein, the the signal modulation unit dynamically adjusts the working parameters according to the detection feedback of the second communication unit to the transmission channel, and the method comprises the following steps: when the second communication unit detects that the signal to noise ratio of the transmission channel fluctuates in real time, the self-adaptive switching GMSK technology and QPSK technology modulate the original signal and maintain the bit error rate less than or equal to 10 -5 during switching.
4. The marine vessel extension alarm system based on direct current power line carrier communication of claim 2, wherein the process of sending the encrypted monitoring signal to the extension alarm module by the second communication unit comprises sending the encrypted monitoring signal to the extension alarm module once in each polling period based on a time slice polling protocol, and completing a polling process, wherein the polling period is 5min.
5. The marine extension warning system based on direct current power line carrier communication of claim 4 wherein the encrypted warning signal comprises an emergency warning signal, an equipment failure warning signal, and the process of the second communication unit transmitting the encrypted warning signal to the extension warning module comprises: judging whether a transmission channel between the second communication unit and the extension alarm module is idle or not through the core control unit; if the transmission channel is idle, judging whether the encrypted carrier signal is an encrypted alarm signal, if so, When the encrypted alarm signal is an emergency alarm signal, immediately interrupting the polling process, preempting channel transmission within a set delay time through a CSMA/CA mechanism, and sending the emergency alarm signal to the extension alarm module; when the encrypted alarm signal is an equipment fault alarm signal, sending the equipment fault alarm signal to the extension alarm module in a gap in the polling process; and after the extension alarm module receives the encrypted alarm signal, ending signal transmission.
6. The ship extension alarm system based on direct current power line carrier communication according to claim 1, wherein the extension alarm module comprises a plurality of cabin nodes, the cabin nodes are connected with a power supply through direct current 24V power terminals, and a central controller is connected with the direct current 24V power terminals of the cabin nodes through 24V direct current power lines, and is provided with a third communication unit, a signal processing unit and a signal demodulation unit; The third communication unit is capable of receiving the encrypted carrier signal; the signal processing unit is capable of processing the encrypted carrier signal; the signal demodulation unit can demodulate the encrypted carrier signal, and when the encrypted carrier signal is an encrypted alarm signal, the demodulated encrypted alarm signal can be restored to obtain alarm information; The audible and visual alarm unit can receive alarm information and trigger alarm operation.
7. The ship extension warning system based on direct current power line carrier communication according to claim 6, wherein the cabin node comprises a cabin node, a crew cabin node and a cabin node, the frequency range of the encrypted carrier signals received by the cabin node and the crew cabin node is 6-10 MHz, and the frequency of the encrypted carrier signals received by the cabin node is 1-5 MHz.
8. The application method of the ship extension alarm system based on direct current power line carrier communication according to any one of claims 1 to 7, which is characterized by comprising the following steps: The original signal is received by the central controller, the original signal is a high-frequency alternating current carrier signal sent by the cabin monitoring alarm system, Modulating an original signal to obtain an encrypted carrier signal, and sending the encrypted carrier signal to an extension alarm module through a 24V direct current power line; And receiving the encrypted carrier signal through the extension alarm module, demodulating the encrypted carrier signal and recovering to obtain alarm information.

Description

Ship extension alarm system and method based on direct-current power line carrier communication Technical Field The invention relates to the technical field of ship safety monitoring, in particular to a ship extension alarm system and method based on direct-current power line carrier communication. Background With the improvement of the automation degree of ships, in the prior art, a power carrier communication technology is generally adopted for communication, the technology can reduce wiring so as to reduce cost, but ships are often in extremely severe and time-varying electromagnetic environments, and the problems of starting and stopping of a diesel engine, high-power radar, a frequency converter and the like are caused by the electromagnetic environments, so that the communication reliability of the prior art is insufficient (for example, the data packet loss rate is more than 15%), the communication is weak before dynamic interference, and the signal transmission efficiency cannot be met. Disclosure of Invention In view of the above, the present invention aims to provide a ship extension alarm system and method based on direct current power line carrier communication, which can reduce the cost and simultaneously satisfy the communication reliability and the signal transmission efficiency. In a first aspect, the embodiment of the invention provides a ship extension alarm system based on direct current power line carrier communication, which comprises a central controller and an extension alarm module, wherein the central controller is connected with the extension alarm module through a 24V direct current power line; the central controller is used for receiving an original signal, the original signal is an RS485 signal sent by the cabin monitoring alarm system, The central controller is also used for modulating the original signal to obtain an encrypted carrier signal, and transmitting the encrypted carrier signal to the extension alarm module through a 24V direct current power line; The extension alarm module is used for receiving the encrypted carrier signal, demodulating the encrypted carrier signal and recovering the encrypted carrier signal to obtain alarm information. Further, a 24V DC power supply terminal is connected to the 24V DC power line. Further, the central controller comprises a first communication unit, a core processing unit, a signal modulation unit and a second communication unit; the first communication unit is capable of receiving an original signal; The core processing unit can send the original signal to the signal modulation unit; the signal modulation unit can divide an original signal into a plurality of sub-carriers by adopting an OFDM technology, and modulate the sub-carriers by adopting a GMSK technology or a QPSK technology to obtain encrypted carrier signals, wherein the number of the sub-carriers is 256, and the cyclic prefix length of each sub-carrier is 4.8 mu s; the second communication unit is capable of transmitting an encrypted carrier signal to the extended alarm module, the encrypted carrier signal comprising an encrypted alarm signal and an encrypted monitor signal. Further, the signal modulation unit can dynamically adjust the working parameters according to the real-time detection feedback of the second communication unit to the transmission channel, Wherein, the the signal modulation unit dynamically adjusts the working parameters according to the detection feedback of the second communication unit to the transmission channel, and the method comprises the following steps: when the second communication unit detects that the signal to noise ratio of the transmission channel fluctuates in real time, the self-adaptive switching GMSK technology and QPSK technology modulate the original signal and maintain the bit error rate less than or equal to 10 -5 during switching. Further, the process of sending the encrypted monitoring signal to the extended alarm module by the second communication unit comprises the step of sending the encrypted monitoring signal to the extended alarm module once in each polling period based on a time slice polling protocol, so that one polling process is completed, and the polling period is 5min. Further, the encrypted alarm signal includes an emergency alarm signal and an equipment failure alarm signal, and the process of sending the encrypted alarm signal to the extension alarm module by the second communication unit includes: judging whether a transmission channel between the second communication unit and the extension alarm module is idle or not through the core control unit; if the transmission channel is idle, judging whether the encrypted carrier signal is an encrypted alarm signal, if so, When the encrypted alarm signal is an emergency alarm signal, immediately interrupting the polling process, preempting channel transmission within a set delay time through a CSMA/CA mechanism, and sending the emergency alarm signal to the extensi