Search

CN-122001863-A - VHF and IP voice fusion communication method and device for special ship

CN122001863ACN 122001863 ACN122001863 ACN 122001863ACN-122001863-A

Abstract

The invention provides a VHF and IP voice fusion communication method and device for special ships. The method comprises the steps of monitoring the environment temperature and the electromagnetic interference intensity in real time, matching a prestored antenna parameter compensation library based on the environment temperature, dynamically optimizing radio frequency front-end transmission parameters, performing multi-mode noise suppression on received VHF audio signals, wherein the multi-mode noise suppression comprises the steps of generating a time-frequency mask based on the electromagnetic interference intensity by adopting a complex convolution attention network to suppress electromagnetic interference, converting the processed signals into IP voice data packets, and reversely converting the IP voice data packets into VHF signals through a protocol conversion engine to realize a bidirectional communication link. The invention improves the voice communication quality and reliability in the polar environment and ensures the navigation safety.

Inventors

  • ZHAO AIXUAN
  • ZENG JI

Assignees

  • 上海海事大学

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. A VHF and IP voice fusion communication method for a special watercraft, the method comprising the steps of: monitoring the environment temperature and the electromagnetic interference intensity in real time; dynamically optimizing radio frequency front end transmission parameters based on an environment temperature matching prestored antenna parameter compensation library, wherein the transmission parameters comprise antenna phase center offset, gain compensation value and impedance matching coefficient; Performing multi-modal noise suppression processing on the received VHF audio signal, comprising: based on the electromagnetic interference intensity, adopting a complex convolution attention network to generate a time-frequency mask to inhibit electromagnetic interference; And converting the processed signal into an IP voice data packet, and reversely converting the IP voice data packet into a VHF signal through a protocol conversion engine to realize a bidirectional communication link.
  2. 2. The method for VHF and IP voice fusion communication for special ships according to claim 1, wherein the matching process of the pre-stored antenna parameter compensation library specifically comprises: Calculating the root mean square error of the temperature interval in the environment temperature and a pre-stored parameter library in real time, and calling the antenna phase center offset, the gain compensation value and the impedance matching coefficient of the corresponding temperature interval if the root mean square error is smaller than a set threshold value; when the ambient temperature is lower than-30 ℃, additionally starting a deformation compensation coefficient of the titanium alloy phase temperature control shell, wherein the deformation compensation coefficient meets the following relational expression: ; Wherein, the Is the deformation quantity of the phase-change temperature-control shell, The titanium alloy has the thermal expansion coefficient of 8.6X10 -6 K -1 , For the initial length of the antenna, In order to be at the temperature of the environment, For the purpose of reference to the ambient temperature, The deformation coefficient is the wind load deformation coefficient and takes the value of 0.024 mm.m 2 /N, In the event of a wind stress load, Is the included angle between the wind direction and the axial direction of the antenna.
  3. 3. A VHF and IP voice fusion communication method for a special watercraft according to claim 1 wherein a time-frequency mask is generated by the complex convolution attention network : ; Wherein, the In order for the convolution kernel to be learnable, As a result of the complex convolution operator, In order to query the matrix, Is the transposed matrix of the key matrix, Is a scaling factor; Training loss function of the complex convolution attention network The method comprises the following steps: ; Wherein, the Is a time-frequency matrix of pure speech, For a time-frequency matrix of the network prediction output, For the regularization coefficient(s), For the noise profile estimated for the network, For the a priori distribution of noise, As a function of the frequency variation, For the noise energy weight of the i-th order, For the i-th order noise center frequency, For the bandwidth of the noise of the i-th order, As a gaussian distribution probability density function.
  4. 4. A VHF and IP voice fusion communication method for special vessels according to claim 3 wherein said complex convolution attention network adopts a complex conformer module and three-dimensional attention mechanism combined architecture, comprising: The complex conformer module adopts a real part expansion convolution path in the time dimension, the convolution kernel expansion factor is d t , and the output characteristics are as follows: ; The frequency dimension adopts an imaginary part expansion convolution path, the convolution kernel expansion factor is d f , and the output characteristics are as follows: ; Wherein Z r 、Z i is the real part matrix and the imaginary part matrix of the input complex spectrum, and d t and d f are dynamically adjusted according to the electromagnetic interference intensity; the three-dimensional attention mechanism specifically performs channel-time-frequency three-dimensional dynamic weighting on the characteristic f=fr+ jFi output by the complex conformer module, ; Wherein, the 、 、 Channel attention weight, time attention weight, frequency attention weight, respectively; Will weight the characteristic And inputting the complex gating circulating unit and finally outputting the time-frequency mask.
  5. 5. The method of claim 1, wherein the protocol conversion engine implements a bi-directional communication link comprising a VHF-to-IP forward link and an IP-to-VHF reverse link; The forward link specifically inputs the VHF audio signal subjected to multi-mode noise suppression processing into a dynamic codec, adopts an ITU-T G.711 codec standard when the end-to-end transmission delay is lower than 200 milliseconds, and switches to the ITU-T G.729A codec standard when the delay is in a 200-500 millisecond interval; The reverse link specifically analyzes DSC distress identification in an IP data packet, if the distress identification is in a distress state, a VHF signal reconstruction module is triggered to carry out priority processing and mark as the highest service level of IEEE 802.1p priority 7, a codec matched with a transmitting end is called to decode IP voice data, electromagnetic interference is secondarily restrained through the complex convolution attention network, and when an X-EMI label value exceeds 20dB, the complex convolution attention network is started.
  6. 6. The VHF and IP voice fusion communication method for a special vessel according to claim 5, wherein the synchronization mechanism of the dynamic codec comprises: the sender declares the current coding and decoding Type in the RTP header extension field Codec-Type, wherein the decoding Type comprises 0x01 for G.711 and 0x02 for G.729A; The receiving end analyzes the Codec-Type field and automatically switches to the same coding and decoding standard, so that the consistency of bidirectional voice coding and decoding is ensured; When the MOS score calculated by the voice quality closed loop monitoring module is below 3.0, the bi-directional link synchronization is downgraded to the 6.3kbps low bit rate coding mode of the ITU-t g.723.1 coding standard.
  7. 7. The method for VHF and IP voice fusion communication for special ships according to claim 6, wherein the guarantee mechanism of bidirectional transmission is specifically as follows: configuring a main and standby double-queue buffer system at the switch layer, wherein the main queue transmits current voice frames in real time, the standby queue pre-stores next voice frame data, and when network congestion is detected, the queue switching is completed within 10 milliseconds; Implementing dynamic jitter buffer control, setting a basic buffer depth to be 50 milliseconds, and dynamically adjusting the buffer depth according to the network delay change rate, wherein the buffer depth=50+20×tanh (0.1×delay change rate); And starting a forward error correction redundancy encapsulation mechanism, adding redundancy error correction packets every 10 voice data packets transmitted, wherein the number of the redundancy packets is dynamically configured according to the real-time packet loss rate, wherein no redundancy packets are added when the packet loss rate is lower than 1%, 20% redundancy packets are added when the packet loss rate is 1% to 5%, and 30% redundancy packets are added when the packet loss rate exceeds 5%.
  8. 8. The method of claim 7, wherein the voice over IP transmission process comprises voice quality closed loop monitoring: the receiving end periodically calculates a voice average opinion score MOS value that MOS=4.5-0.008×end-to-end delay-0.032×packet loss percentage; When the MOS score is lower than 3.0, a codec degradation instruction is sent to a sending end, and the method is automatically switched to a 6.3kbps low bit rate coding mode of the ITU-T G.723.1 standard; establishing an encrypted transmission quality log, associating and storing temperature, electromagnetic interference intensity, time delay and MOS scoring data, and reserving the log according to the requirement for not less than 3 months.
  9. 9. The method of claim 8, wherein the bi-directional communication link is designed for polar environment augmentation, comprising: the network equipment meets the wide temperature working range of-40 ℃ to +70 ℃ specified by IEC 60092-509 standard; the main communication link adopts an armored optical cable with tensile strength not lower than 2000N; the exchanger is provided with a phase-change heat dissipation module, and is filled with a paraffin-based composite material with the melting point of-35 ℃, and the phase-change latent heat is not lower than 200J/g; The key communication port is provided with a pi-type filter, and the insertion loss of not less than 40 dB is provided in the frequency band of 30-300 MHz; the equipment cabinet meets the 90 dB shielding effectiveness requirement specified by the MIL-STD-461G standard.
  10. 10. A VHF and IP voice fusion communication device for a special watercraft, the device comprising: The main control module is used for realizing environment-aware data processing, protocol conversion control and resource scheduling through the multi-core heterogeneous processor; The VHF signal processing module is connected with the ship very high frequency radio station, is internally provided with a three-stage electromagnetic shielding structure and a DSC decoding unit and is used for receiving and preprocessing VHF signals and outputting noise-reduced audio streams; The voice enhancement module is integrated with the adaptive comb filter bank and the complex convolution attention network hardware accelerator and is used for suppressing engine noise and electromagnetic interference and generating a voice signal conforming to the IP transmission standard; The environment sensing unit comprises a wide temperature sensor, a triaxial magnetometer and an integrated navigation module, acquires temperature, electromagnetic interference intensity and position data in real time, and provides input for thermal deformation compensation and position correction; The protocol conversion engine is configured to dynamically select a coder-decoder, an encapsulation environment label and position metadata, and convert the VHF audio stream into an IP voice data packet; the network transmission module supports double-network port redundancy and Wi-Fi 6 protocol, implements double-queue buffering, dynamic jitter control and forward error correction mechanism, and ensures the reliability of voice transmission in the ship local area network; The polar region strengthening structure comprises a phase temperature control shell and an armored connector; And the power management system integrates a lithium titanate backup battery, so that the endurance time in an extreme environment is ensured.

Description

VHF and IP voice fusion communication method and device for special ship Technical Field The invention relates to the technical field of ship communication, in particular to a VHF and IP voice fusion communication method and device for special ships. Background At present, special ships in service in China are all provided with computer network systems with complete functions, and various IP-based communication services such as IP voice, video monitoring, video conference, eLTE digital clusters and the like are provided inside the ships. Meanwhile, according to ship building specifications, a very high frequency communication system (VHF) is also an essential component of a polar ship conducting system. The very high frequency communication system (VHF) is a conventional radio communication system, and is widely used in the fields of aviation, navigation, ground emergency communication, and the like. Voice over IP is carried over an IP network, and is implemented by a packet switching technology based on the communication scheme of the Internet Protocol (IP). The very high frequency system and the IP voice have remarkable differences in the aspects of communication principles, transmission media, communication protocols and the like, and the very high frequency and the IP voice of the present in-service polar ship are independently operated and used. On commercial or other conventional vessels, very high frequency communication systems (VHF) are used as an important communication means at the vessel end, and the use groups of VHF are mainly crews for shipboard operation, so that the requirement of fusion and intercommunication of the two systems is not outstanding. The personnel composition of the special ship comprises crew members, on-board scientific investigation personnel, aviation scientific investigation personnel, investigation team management personnel and the like, and in-board communication is usually performed in hundreds of people, and more people use IP-based communication services besides a very high frequency system (VHF) for a ship. The polar region ship investigation operation relates to unified scheduling and cooperative cooperation of all parts of the ship and various personnel, the various personnel need to be tightly matched to ensure the operation safety and complete the operation task, and the requirements of fusion and intercommunication of various communication means in the polar region ship are particularly outstanding in the scene. Aiming at the problems, the prior art relies on a general commercial equipment combination, and does not need to carry out integrated design aiming at the low-temperature strong interference environment, the multi-source noise characteristic and the collaborative operation of the polar ship, so that the deployment in the polar scientific investigation scene is limited. Therefore, there is a need for a highly integrated, environmentally adaptive and fully functional integrated communication device that enables deep integration of polar marine VHF and voice-over-IP systems. Disclosure of Invention The invention provides a VHF and IP voice fusion communication method and device for special ships, which are used for solving the problems of high discrete deployment cost, poor environmental adaptability, function cracking and the like of a communication system in a polar environment. The invention specifically provides the following technical scheme: A VHF and IP voice fusion communication method for a specialty marine vessel, said method comprising the steps of: monitoring the environment temperature and the electromagnetic interference intensity in real time; dynamically optimizing radio frequency front end transmission parameters based on an environment temperature matching prestored antenna parameter compensation library, wherein the transmission parameters comprise antenna phase center offset, gain compensation value and impedance matching coefficient; Performing multi-modal noise suppression processing on the received VHF audio signal, comprising: based on the electromagnetic interference intensity, adopting a complex convolution attention network to generate a time-frequency mask to inhibit electromagnetic interference; And converting the processed signal into an IP voice data packet, and reversely converting the IP voice data packet into a VHF signal through a protocol conversion engine to realize a bidirectional communication link. Optionally, the matching process of the pre-stored antenna parameter compensation library specifically includes: Calculating the root mean square error of the temperature interval in the environment temperature and a pre-stored parameter library in real time, and calling the antenna phase center offset, the gain compensation value and the impedance matching coefficient of the corresponding temperature interval if the root mean square error is smaller than a set threshold value; when the ambient temperature is lower than-3