Marine very high frequency radio equipment based on NMEA2000 bus

Abstract

The utility model discloses marine VHF (very high frequency) radio equipment based on an NMEA2000 bus, which comprises a VHF radio equipment host and a control terminal, and is characterized in that the VHF radio equipment host comprises a first sound receiving and emitting module, a first audio conversion module, a first control module and a first NMEA2000 transceiver which are connected in sequence; the control terminal comprises a second sound receiving and emitting module, a second audio conversion module, a second control module and a second NMEA2000 transceiver which are connected in sequence; and the first NMEA2000 transceiver and the second NMEA2000 transceiver are respectively connected with the NMEA2000 bus. According to the technical scheme, an NMEA2000 bus network of a ship is accessed, efficient interaction between the VHF radio equipment host and the control terminal is achieved, the universality and compatibility of the equipment are ensured, additional wiring is not needed, and the installation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to marine communication technical field especially relates to a marine very high frequency radio equipment based on NMEA2000 bus. BACKGROUND

[0002] Marine very high frequency (namely VHF) radio communication refers to the radio communication between ship and shore user by using VHF special frequency band for ship-to-ship, ship internal, ship-to-shore or shore station and land communication switching. It is widely used in ship avoidance, maritime management, port scheduling, ship internal management, distress rescue and safety information broadcast, etc. and is the main means to complete water traffic site communication. VHF communication is irreplaceable for other communication methods in terms of guaranteeing ship navigation safety. VHF radio equipment is installed in a fixed way, when the crew needs to operate the VHF equipment, the crew needs to reach the area where the equipment is installed to operate. For the application scene of large ship, there is a long distance control demand. That is, the VHF radio equipment can be operated in different space areas of the ship. Therefore, the design of the marine very high frequency radio equipment needs to increase the function of supporting one or more wired control terminal connections.

[0003] The prior art has several deficiencies:

[0004] 1. The interface between the control terminal and the VHF equipment is special, that is, the equipment is not universal.

[0005] 2. The connection between the control terminal and the VHF equipment needs to lay special cables, which is high in cost.

[0006] 3. Based on the form of control signal, the current common RS485 control can work normally in short distance, but with the increase of the number of control terminals and the lengthening of the communication distance, the technical solution will not work well. INVENTION CONTENT

[0007] The utility model embodiment provides a marine very high frequency radio equipment based on NMEA2000 bus to solve the above technical problems.

[0008] The utility model discloses a first aspect provides a kind of marine very high frequency radio equipment based on NMEA2000 bus, it include: VHF radio equipment host computer and control terminal, the VHF radio equipment host computer includes the first transceiving sound module, first audio conversion module, first control module and first NMEA2000 transceiver connected in sequence, the control terminal includes the second transceiving sound module, second audio conversion module, second control module and second NMEA2000 transceiver connected in sequence, the first NMEA2000 transceiver and the second NMEA2000 transceiver are connected the NMEA2000 bus respectively.

[0009] Optionally, the first transceiving sound module includes a first microphone and a first speaker, and the first microphone and the first speaker are connected to the first audio conversion module respectively.

[0010] Optionally, the radio equipment host computer further includes an antenna and a demodulation and modulation module, the antenna is connected to the demodulation and modulation module, and the demodulation and modulation module is connected to the first audio conversion module.

[0011] Optionally, the second transceiving sound module includes a second microphone and a second speaker, and the second microphone and the second speaker are connected to the second audio conversion module respectively.

[0012] Optionally, the first NMEA2000 transceiver includes a first filter module, a first data conversion module and a first isolation module connected in sequence, the first filter module is connected to the NMEA2000 bus, and the first data conversion module is connected to the first control module.

[0013] Optionally, the second NMEA2000 transceiver includes a second filter module, a second data conversion module and a second isolation module connected in sequence, the second filter module is connected to the NMEA2000 bus, and the second data conversion module is connected to the second control module.

[0014] Optionally, the control terminal is arranged near an engine to collect noise of the engine.

[0015] Optionally, the control module further includes a noise sensor module, a preamplifier module and a filter module connected in sequence, and the filter module is connected to the second audio conversion module.

[0016] The technical effect of the embodiment of the utility model is that: through the NMEA2000 bus network of the ship, the efficient interaction of the VHF radio equipment host and the control terminal is realized, the standardization characteristics of the NMEA2000 protocol are used, the universality and compatibility of the equipment are ensured, no additional wiring is needed, the installation cost is reduced, based on the high reliability of the NMEA200 bus, the communication distance is longer, the communication range and performance are significantly improved, and the utility model is suitable for the complex application environment of the ship. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed to be used in the description of the embodiment of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor of the ordinary skilled in the art.

[0018] Figure 1 It is the first kind of structure schematic view of marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0019] Figure 2 It is the second kind of structure schematic view of marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0020] Figure 3 It is the structure schematic view of the first NMEA2000 transceiver in the marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0021] Figure 4 It is the structure schematic view of the second NMEA2000 transceiver in the marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0022] Figure 5 It is the circuit diagram of the digital-analog conversion module in the marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0023] Figure 6 It is the circuit diagram of the NMEA2000 transceiver in the marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0024] Figure 7 It is the third kind of structure schematic view of marine very high frequency radio equipment based on NMEA2000 bus provided by the embodiment one of the utility model;

[0025] Figure 8 is a fourth structural schematic view of a marine very high frequency radio device based on NMEA2000 bus provided by the embodiment one of the present application;

[0026] In the figure: 10, VHF radio device host; 20, control terminal; 30, NMEA2000 bus; 102, first audio conversion module; 101, first transceiving audio module; 102, first audio conversion module; 103, first control module; 104, first NMEA2000 transceiver; 105, demodulation modulation module; 106, antenna; 201, second transceiving audio module; 202, second audio conversion module; 203, second control module; 204, second NMEA2000 transceiver; 141, first filter module; 142, first data conversion module; 143, first isolation module; 241, second filter module; 242, second data conversion module; 243, second isolation module. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments presented herein. On the contrary, the embodiments are provided to make the disclosure complete and complete and to fully convey the scope of the present application to those skilled in the art. In the drawings, the sizes and relative sizes of the layers and regions may be exaggerated for clarity throughout the same reference signs represent the same elements.

[0029] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0030] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0031] Example 1

[0032] This embodiment provides a marine VHF radio device based on the NMEA2000 bus, such as... Figure 1 As shown, it includes: a VHF radio equipment host 10 and a control terminal 20. The VHF radio equipment host 10 includes a first receiver / speaker module 101, a first audio conversion module 102, a first control module 103, and a first NMEA2000 transceiver 104 connected in sequence. The control terminal 20 includes a second receiver / speaker module 201, a second audio conversion module 202, a second control module 203, and a second NMEA2000 transceiver 204 connected in sequence. The first NMEA2000 transceiver 104 and the second NMEA2000 transceiver 204 are respectively connected to the NMEA2000 bus.

[0033] The first transceiving sound module 101 is used for transmitting and receiving audio signals. When receiving audio signals, the first transceiving sound module 101 transmits the audio signals to the first audio conversion module 102. When it is necessary to transmit audio signals, the first transceiving sound module 101 receives the processed signals from the first audio conversion module 102 and outputs them. The first audio conversion module 102 is used to complete digital-to-analog conversion or analog-to-digital conversion of audio signals. If it is a receiving direction, the first audio conversion module 102 converts analog audio signals into digital audio signals for subsequent processing. If it is a transmitting direction, the first audio conversion module 102 converts digital signals into analog audio signals and transmits them to the first transceiving sound module 101. The first control module 103 compresses or decompresses digital audio signals, reduces data volume, and improves transmission efficiency. When receiving digital audio signals, the first control module 103 compresses the signals, reduces data volume, and transmits the compressed signals to the first NMEA2000 transceiver 104. When receiving signals from the first NMEA2000 transceiver 104, the first control module 103 decompresses the signals, restores the original audio signals, and transmits them to the first audio conversion module 102. The first NMEA2000 transceiver 104 completes protocol conversion between signals of the first control module 103 and NMEA2000 bus signals. When receiving signals from the first control module 103, the first NMEA2000 transceiver 104 converts the signals into signals conforming to the NMEA2000 bus protocol and transmits them to the NMEA2000 bus. When receiving signals from the NMEA2000 bus, the first NMEA2000 transceiver 104 converts the signals into a format that can be processed by the first control module 103 and transmits them to the first control module 103. The second transceiving sound module 201 controls transmission and reception of audio signals of the control terminal. When receiving audio signals, the second transceiving sound module 201 transmits the signals to the second audio conversion module 202. When it is necessary to transmit audio signals, the second transceiving sound module 201 receives signals from the second audio conversion module 202 and outputs them. The second audio conversion module 202 performs digital-to-analog or analog-to-digital conversion on audio signals of the control terminal. If it is a receiving direction, the second audio conversion module 202 converts analog audio signals into digital signals and transmits them to the second control module 203. If it is a transmitting direction, the second audio conversion module 202 converts digital audio signals into analog audio signals and transmits them to the second transceiving sound module 201. The second control module 203 compresses or decompresses digital audio signals of the control terminal. When receiving digital audio signals, the second control module 203 compresses the signals and transmits them to the second NMEA2000 transceiver 204. When receiving signals from the second NMEA2000 transceiver 204, the second control module 203 decompresses the signals, restores the original audio signals, and transmits them to the second audio conversion module 202.The second NMEA2000 transceiver 204 completes the protocol conversion between the control module signal and the NMEA2000 bus signal. When receiving the signal from the second control module 203, the second NMEA2000 transceiver 204 converts the signal into a signal conforming to the NMEA2000 bus protocol and sends it to the NMEA2000 bus 30. When receiving the signal from the NMEA2000 bus 30, the second NMEA2000 transceiver 204 converts the signal into a format that the control module can process and delivers it to the second control module 203. The NMEA2000 bus 30 serves as a communication bridge between the VHF radio host and the control terminal. The compressed audio signal and the control and status information are transmitted through the NMEA2000 bus 30. Real-time synchronization of audio data and control commands between the VHF radio host 10 and the control terminal 20 is ensured. The overall workflow, sending direction: the VHF radio host 10 receives the audio signal through the first transceiving sound module 101, processes it through the first audio conversion module 102 and the first control module 103, and sends it to the NMEA2000 bus through the first NMEA2000 transceiver 104. The NMEA2000 bus delivers the signal to the second NMEA2000 transceiver 204 of the control terminal 20, which outputs it to the second transceiving sound module 201 after decompression and digital-to-analog conversion. Receiving direction: the control terminal 20 receives the audio signal through the second transceiving sound module 201, which processes it through the second audio conversion module 202 and the second control module 203, and sends it to the NMEA2000 bus through the second NMEA2000 transceiver 204. The NMEA2000 bus delivers the signal to the first NMEA2000 transceiver 104 of the VHF radio host 10, which outputs it to the first transceiving sound module 101 after decompression and digital-to-analog conversion. Through the cooperation of these modules, efficient audio data transmission and control functions based on the NMEA2000 bus 30 are realized.

[0034] The technical effect of the technical solution provided by the first embodiment is that by accessing the NMEA2000 bus network of the ship, efficient interaction between the VHF radio host and the control terminal is realized, the standardization characteristics of the NMEA2000 protocol are utilized to ensure the universality and compatibility of the device, no additional wiring is required, the installation cost is reduced, the high reliability of the NMEA200 bus is based on, the communication distance is supported for a long time, the communication range and performance are significantly improved, and it is suitable for complex application environment of the ship.

[0035] As an implementation manner, the first transceiving sound module 101 includes a first microphone and a first speaker, and the first microphone and the first speaker are connected to the first audio conversion module 102, respectively.

[0036] The first transceiving sound module 101 includes a first microphone and a first speaker, respectively used for audio signal collection (input) and playing (output). The first microphone converts sound into an electrical signal, and the first speaker converts an electrical signal into sound. The first microphone collects external sound (for example, user voice) and converts it into an analog electrical signal. The analog electrical signal is transmitted to the first audio conversion module 102 for analog-to-digital conversion and subsequent processing. The first speaker receives the processed audio signal (converted into an analog signal) from the first audio conversion module 102, converts the analog signal into sound for playing, and realizes audio output.

[0037] The technical effect of the embodiment is that the first microphone and the first speaker realize the bidirectional interaction function of the audio signal, support the call and broadcast capabilities of the VHF radio device. High-definition audio collection and playing are provided to ensure high-quality communication.

[0038] As an embodiment, as shown in Figure 2 The radio device host also includes an antenna 106 and a demodulation and modulation module 105. The antenna 106 is connected to the demodulation and modulation module 105, and the demodulation and modulation module 105 is connected to the first audio conversion module 102.

[0039] The antenna 106 is used to send and receive radio signals. It converts radio signals from electromagnetic wave form to electrical signal (receiving direction) or converts electrical signal to electromagnetic wave form (transmitting direction). In the receiving direction, the antenna 106 captures the very high frequency (VHF) radio electromagnetic wave signal in the external environment. The electromagnetic wave signal is converted into an electrical signal and transmitted to the demodulation and modulation module 105 for further processing. In the transmitting direction, the modulated electrical signal is received from the demodulation and modulation module 105. The electrical signal is converted into an electromagnetic wave signal and radiated into the external environment to realize the transmission of radio signals. The demodulation and modulation module 105 demodulates the received radio signal to extract the audio signal or digital data, and modulates the transmitted audio signal or digital data to generate a signal suitable for radio transmission. The demodulation process: after receiving the radio signal from the antenna, the demodulation and modulation module 105 demodulates the signal to extract the audio signal or data carried. The demodulated signal is transmitted to the first audio conversion module 102 in the form of an electrical signal for further processing (analog-to-digital conversion). The modulation process: after receiving the audio signal or digital signal from the first audio conversion module 102, the demodulation and modulation module 105 modulates the signal to convert it into a radio signal suitable for VHF frequency transmission, and transmits the modulated signal to the antenna 106 for wireless transmission.

[0040] The technical effect of the embodiment is that the cooperation of the antenna and the demodulation and modulation module enables the entire radio device host to realize complete signal receiving, processing, modulation and sending functions, thereby providing the VHF radio device with powerful communication capabilities.

[0041] As an implementation manner, the second transceiving sound module 201 includes a second microphone and a second speaker, and the second microphone and the second speaker are connected with the second audio conversion module 202 respectively.

[0042] The second microphone is configured to collect audio signals (for example, user voice instructions) of the control terminal, capture voice of the user or sound signals in the environment, convert the captured analog sound signals into analog electric signals, and transmit the analog electric signals to the second audio conversion module 202 for analog-digital conversion and subsequent processing. The second speaker is configured to play audio signals received by the control terminal 20, convert the electric signals into sound, and provide the user with real-time listening. The second audio conversion module 202 receives the processed analog audio signals, converts the received analog electric signals into sound signals, and outputs sound for the user to receive, for example, communication content or prompt sound.

[0043] The technical effect of the embodiment is that the combination of the second microphone and the second speaker realizes the audio input and output functions of the control terminal, and supports the half-duplex working mode between the control terminal and the host.

[0044] As an implementation manner, as shown in Figure 3 The first NMEA2000 transceiver 104 includes a first filtering module 141, a first data conversion module 142 and a first isolation module 143 connected in sequence, the first filtering module 141 is connected with the NMEA2000 bus, and the first data conversion module 142 is connected with the first control module 103.

[0045] The first filter module 141 filters the signals received from the NMEA2000 bus 30, removes unnecessary high-frequency noise and electromagnetic interference using a low-pass filter, a band-pass filter or other filtering techniques, and sends the filtered signals to the first data conversion module 142. The first data conversion module 142 converts the filtered NMEA2000 bus signals into a format that the first control module 103 can process. At the same time, it converts the signals from the first control module 103 into a format compatible with the NMEA2000 bus protocol. Receive direction (from bus to control module): The first data conversion module 142 receives NMEA2000 protocol signals from the first filter module 141. The protocol signals are parsed, the valid data is extracted and converted into a data format supported by the first control module 103. The converted data is sent to the first control module 103. Transmit direction (from control module to bus): The first data conversion module 142 receives instruction data from the first control module 103. The data is converted into a signal that conforms to the NMEA2000 protocol format. The converted signal is passed to the first isolation module 143. The first isolation module 143 receives signals from the first data conversion module 142, uses optical coupling, transformer or capacitive isolation technology to achieve physical isolation of the signals, and ensures signal integrity transmission while cutting off the electrical connection. The isolated signal is sent to the NMEA2000 bus (transmit direction) or passed to the first data conversion module 142 (receive direction).

[0046] The technical effect of the embodiment is that through the cooperative work of the first filter module, the first data conversion module and the first isolation module, high-quality signal reception, analysis and format conversion from the NMEA2000 bus to the control module, and protocol conversion and signal transmission from the control module to the NMEA2000 bus are realized. The first filter module effectively removes high-frequency noise and interference, improving signal quality; the first data conversion module ensures protocol compatibility and data transmission accuracy; the first isolation module enhances the safety and anti-interference ability of the system through physical isolation, ensuring the stability and reliability of signal transmission.

[0047] As an embodiment, as shown in Figure 4 The second NMEA2000 transceiver 204 includes a second filter module 241, a second data conversion module 242 and a second isolation module 243 connected in sequence, the second filter module 241 is connected to the NMEA2000 bus, and the second data conversion module 242 is connected to the second control module 203.

[0048] The second filtering module 241 preprocesses the signals received from the NMEA2000 bus, filtering out high-frequency noise, low-frequency interference, and other non-target signals, ensuring the quality of the signals passed to the subsequent modules. The processed signals are output to the second data conversion module 242 for subsequent data parsing and format conversion. The second data conversion module 242 implements signal format conversion and data parsing, converting the filtered NMEA2000 signals into a digital signal format recognizable by the second control module 203, while completing data packaging and encapsulation from the second control module 203 to the NMEA2000 bus 30. The filtered NMEA2000 signals are received from the second filtering module 241, the NMEA2000 protocol data frame is parsed, and the valid information (such as device address, data field, etc.) is extracted, and the extracted data is converted into the format required by the second control module 203. For example, the information transmitted by the NMEA2000 bus 30 is represented in a specific string format, such as an abcd string, the meaning of which is defined by the protocol, and abcd may represent the instruction "turn up the volume by one notch". When the control module receives the abcd string, it parses the string according to the protocol and identifies its meaning as "turn up the volume by one notch", and performs the corresponding operation, realizing the functional interaction with the host or other devices. This design ensures the standardized processing of NMEA2000 bus signals and supports more custom functions through protocol expansion (such as adjusting the volume, switching modes, triggering specific actions, etc.), thereby improving the adaptability and flexibility of the system. When receiving instructions or data from the second control module 203, the data is encapsulated into a standard frame according to the NMEA2000 protocol format. Add necessary protocol headers, check codes and data fields to ensure that the data conforms to the NMEA2000 communication standard. The encapsulated data is passed to the second isolation module 243 for transmission to the NMEA2000 bus 30. The second isolation module 243 provides signal and electrical isolation to prevent electrical faults or noise interference on the NMEA2000 bus 30 from affecting the internal control module, while ensuring the integrity and safety of the signal. When the NMEA2000 bus signal passes through the second data conversion module 242, optical couplers, transformers or capacitive isolation techniques are used to electrically isolate the signal. Isolate high voltage and current noise to prevent it from being transmitted to the internal circuit. The isolated signal is regenerated and transmitted to the NMEA2000 bus (transmission direction) or to the second data conversion module 242 (reception direction).

[0049] The technical effect of the embodiment is that the stable communication between the NMEA2000 bus and the internal control module is ensured through the synergistic effect of the second filtering module, the second data conversion module and the second isolation module. The second filtering module effectively removes noise and interference, and improves signal quality; the second data conversion module realizes protocol analysis, format conversion and data encapsulation, and ensures the compatibility and accuracy of data transmission; the second isolation module provides electrical isolation to prevent external electrical faults and interference from affecting the internal circuit, and enhances the safety of the system and the reliability of signal transmission.

[0050] The digital-to-analog conversion module realizes two functions, which are analog-to-digital conversion of the transmitted audio and digital-to-analog conversion of the received digital audio signal into analog received audio. As an example, as shown in Figure 5 The digital-to-analog conversion module is a chip CODEC, the LIN1 pin in the chip CODEC receives an audio signal through a capacitor C11, and the LOUT1 pin in the chip CODEC outputs an audio signal through a capacitor C14.

[0051] The NMEA2000 transceiver realizes two key functions, the first is to realize isolation between the data of the NMEA2000 bus and the device, and the second is to realize a conversion function between the differential signal of the NMEA2000 bus and the single-ended transceiving signal processed by the MCU. As an example, as shown in Figure 6As shown, the interface J1 is connected with the NMEA2000 bus, the pin 1 of the interface J1 is connected with the first end of the variable resistor RV1 and the first end of the variable resistor RV2 respectively, the pin 2 of the interface J2 is connected with the second end of the variable resistor RV1, the first end of the variable resistor RV3, the first end of the capacitor C1 and the first end of the voltage stabilizing tube TVS respectively, the second end of the variable resistor RV2, the second end of the capacitor C1, the second end of the variable resistor RV3 and the second end of the voltage stabilizing tube TVS are grounded, the pin 4 of the interface J1 is connected with the first end of the inductor coil L1 and the first end of the capacitor C7 respectively, the pin 5 of the interface J1 is connected with the second end of the inductor coil L1 and the first end of the capacitor C7 respectively, the pin 7 of the data conversion chip U3 is connected with the third end of the inductor coil L1, the pin 6 of the data conversion chip U3 is connected with the fourth end of the inductor coil L1, the pin 3 of the data conversion chip U3 is grounded through the capacitor C2, the pin 5 of the data conversion chip U3 is grounded through the capacitor C3, the pin 1 of the data conversion chip U3 is connected with the first end of the resistor R1 and the collector of the triode of the photoelectric coupler U1 respectively, the second end of the resistor R1 is connected with the first end of the capacitor C4 and the pin 6 of the photoelectric coupler U1 respectively, the emitter of the triode of the photoelectric coupler U1 is grounded, the anode of the diode of the photoelectric coupler U1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the capacitor C5, the cathode of the diode of the photoelectric coupler U1 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the CAN-TX pin of the control module, the pin 4 of the data conversion chip U3 is connected with the cathode of the diode of the photoelectric coupler U2, the anode of the diode of the photoelectric coupler U2 is connected with the first end of the resistor R4, the second end of the resistor R4 is connected with high level, the collector of the triode of the photoelectric coupler U2 is connected with the first end of the resistor R10 and the first end of the resistor R11 respectively, the second end of the resistor R10 and the first end of the capacitor C8 are connected with high level after being connected in common, the second end of the capacitor C8 is connected with the pin 6 of the photoelectric coupler U2, and the second end of the resistor R11 is connected with the CAN-RX pin of the control module.

[0052] The working process of the circuit structure is as follows: the photoelectric coupler U1 receives the signal of the control module, the data conversion chip U3 converts the signal of the control module and then outputs to the NMEA2000 bus through the interface J1.

[0053] The marine VHF radio equipment based on the NMEA2000 bus provided by the utility model has the advantages of Figure 7 and Figure 8 As shown, the interactive process among the three kinds of VHF radio equipment main machines 10 and the control terminal 20 is involved:

[0054] 1、Control terminal 20 controls VHF radio host 10 to perform channel change. The second control module 203 of the control terminal 10 packs the control instruction according to the NMEA2000 protocol, and sends it to the NMEA2000 bus 30 in the ship through the second NMEA2000 transceiver 204 to output to the VHF radio host 10. The VHF radio host 10 receives the data on the NMEA2000 bus 30, converts it into a signal that the first control module 103 can process through the first NMEA2000 transceiver 104, and then the first control module 103 parses the signal and restores it to a control instruction to control the VHF radio host.

[0055] 2、Control terminal 20 controls VHF radio host 10 to perform voice transmission operation:

[0056] The control terminal 20 performs AD analog-digital conversion on the transmitted audio through the second audio conversion module 202, and the second control module 203 packs and compresses the converted data before sending it to the NMEA2000 bus 30 in the ship through the second NMEA2000 transceiver 204, and then outputting it to the VHF radio host 10. The VHF radio host 10 receives the voice data on the NMEA2000 bus 30, converts it into a signal that the first control module 103 can process through the first NMEA2000 transceiver 104, and then performs DA digital-analog conversion on the signal through the first audio conversion module 102 after decompression and analysis. The converted analog audio signal is modulated and transmitted by the antenna.

[0057] 3、VHF radio host 10 receives voice signals and transmits them to control terminal 20 for playback:

[0058] The VHF radio host 10 inputs the demodulated audio signal received by the VHF RX circuit to the first audio conversion module 102 for AD analog-digital conversion, and then the first control module 103 packs and compresses the converted data before sending it to the NMEA2000 bus 30 in the ship through the first NMEA2000 transceiver 104 to output to the control terminal 20. The control terminal 20 receives the voice data on the NMEA2000 bus 30, converts it into a signal that the second control module 203 can process through the second NMEA2000 transceiver 204, and then performs DA digital-analog conversion on the signal through the second audio conversion module 202 after decompression and analysis. The converted analog audio signal is played back.

[0059] Further, the control terminal is arranged near the engine for collecting engine noise.

[0060] The control module further comprises a noise sensor module, a pre-amplification module and a filter module connected in sequence, and the filter module is connected to the second control module.

[0061] The noise sensor module captures the engine noise signal (sound wave signal or vibration noise) and converts it into an electrical signal. The noise sensor module (such as a microphone or an acceleration sensor) senses the noise signal generated during the operation of the engine and converts the sound wave signal into an analog voltage signal. The vibration sensor (such as an accelerometer) senses mechanical vibration and converts it into an electrical signal. The pre-amplification module amplifies the weak signal output by the noise sensor, making the signal suitable for subsequent filtering and digitization processing. The low-level signal (usually microvolts or millivolts) received by the noise sensor is linearly amplified using a low-noise operational amplifier, with the amplification factor determined by the output characteristics of the sensor, usually 10 to 100 times. The filter module performs frequency-selective processing on the noise signal, removing signals in unwanted or interfering frequency bands. The second control module 203 packages and compresses the noise data before sending it to the NMEA2000 bus 30 in the ship through the second NMEA2000 transceiver 204, and then outputting it to the VHF radio equipment host 10. The VHF radio equipment host 10 receives the voice data on the NMEA2000 bus 30, converts it into a signal that can be processed by the first control module 103 through the first NMEA2000 transceiver 104, and then decompresses and analyzes the signal to extract the frequency spectrum, intensity and other characteristics of the noise signal, and identifies whether there is an abnormality. If the noise signal exceeds the set threshold, an alarm is triggered and an abnormal event is recorded.

[0062] This scheme can real-time, efficiently collect, process and analyze the noise signal of the engine, so as to realize noise monitoring and abnormal diagnosis.

[0063] Further, the navigation sub-network includes navigation devices and a navigation NMEA2000 bus, providing core navigation information of the ship, including positioning, speed, heading, etc., to ensure the accuracy and real-time of navigation data. The navigation devices include a GPS receiver (global positioning), an electronic compass (heading detection), a speedometer (speed measurement), an autopilot system (heading control), a radar module (obstacle detection), a depth gauge, and a weather gauge (environmental monitoring). The navigation devices form an independent navigation sub-network, interconnected through the navigation NMEA2000 bus. Data that need to be shared with the voice sub-network (such as heading broadcast) are transmitted through a bridge device. The monitoring sub-network includes monitoring devices and a monitoring NMEA2000 bus, which monitors and manages the real-time operation status of the ship to ensure safe operation. It supports alarm functions to detect abnormal conditions in a timely manner. The monitoring devices include an engine status monitoring module (speed, temperature, oil pressure), a fuel sensor (fuel remaining), an environmental sensor (temperature and humidity, CO2), a power monitoring module (voltage, current), and a security device (fire alarm, hatch status). Various monitoring devices are connected through the monitoring NMEA2000 bus to form a monitoring sub-network. Safety alarm data can be transmitted to the navigation and voice sub-networks through a bridge device to trigger an alarm broadcast. An intelligent network bridge device or gateway is used to connect the voice, navigation, and monitoring sub-networks. Key navigation information (such as heading and destination) is transmitted to the voice sub-network to achieve voice broadcasting. Important alarm information (such as fire and low fuel) is transmitted to the voice sub-network to trigger a broadcast. Environmental monitoring data (such as wind speed and wave height) is transmitted to the navigation sub-network for navigation adjustment. The NMEA2000 bus is connected to the navigation NMEA2000 bus and the monitoring NMEA2000 bus through a bridge device. The bridge device includes an NMEA2000 bridge, which is the most direct bridge device and can connect two or more independent NMEA2000 sub-networks to achieve data forwarding, filtering, or conversion. The NMEA2000 bridge connects the navigation sub-network and the monitoring sub-network. The NMEA2000 bridge connects the NMEA2000 bus and the navigation NMEA2000 bus, respectively, and only forwards key navigation data (such as heading and destination) to the voice broadcast system. High-frequency data from the monitoring sub-network is filtered, and only alarm data is transmitted to other sub-networks. The bridge device also includes an NMEA2000 gateway, which is a more complex bridge device that can interconnect NMEA2000 data with other protocols (such as Ethernet, Wi-Fi, RS485) or other network types. The NMEA2000 gateway connects the NMEA2000 bus and the monitoring NMEA2000 bus, respectively, transmits NMEA2000 navigation data to the ship's Ethernet network for display or remote monitoring, and converts engine status data from the monitoring sub-network to Modbus protocol for access by the upper computer.

[0064] The construction of the voice, navigation and monitoring sub-networks is based on the principles of function separation, communication optimization and data sharing, and efficient, safe and flexible ship system communication architecture is realized through NMEA2000 bus interconnection and bridging strategy.

[0065] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A marine VHF radio based on NMEA 2000 bus, characterized in that, The application relates to a VHF radio equipment host and a control terminal, wherein the VHF radio equipment host comprises a first transceiving sound module, a first audio conversion module, a first control module and a first NMEA2000 transceiver connected in sequence, the control terminal comprises a second transceiving sound module, a second audio conversion module, a second control module and a second NMEA2000 transceiver connected in sequence, and the first NMEA2000 transceiver and the second NMEA2000 transceiver are connected to the NMEA2000 bus respectively. The first transceiving sound module comprises a first microphone and a first loudspeaker, and the first microphone and the first loudspeaker are connected to the first audio conversion module respectively.

2. A marine very high frequency radio device as claimed in claim 1, characterized in that The radio equipment host further comprises an antenna and a demodulation and modulation module, the antenna is connected to the demodulation and modulation module, and the demodulation and modulation module is connected to the first audio conversion module.

3. The marine very high frequency radio of claim 1, wherein, The second transceiving sound module comprises a second microphone and a second loudspeaker, and the second microphone and the second loudspeaker are connected to the second audio conversion module respectively.

4. The marine very high frequency radio of claim 1, wherein, The first NMEA2000 transceiver comprises a first filter module, a first data conversion module and a first isolation module connected in sequence, the first filter module is connected to the NMEA2000 bus, and the first data conversion module is connected to the first control module.

5. The marine very high frequency radio of claim 1, wherein, The second NMEA2000 transceiver comprises a second filter module, a second data conversion module and a second isolation module connected in sequence, the second filter module is connected to the NMEA2000 bus, and the second data conversion module is connected to the second control module.

6. The marine very high frequency radio of claim 1, wherein, The control terminal is arranged near an engine and is used for collecting the noise of the engine.

7. The marine very high frequency radio of claim 1, wherein, The control module further comprises a noise sensor module, a preamplification module and a filter module connected in sequence, and the filter module is connected to the second audio conversion module.

8. A marine very high frequency radio device as claimed in claim 7, characterized in that ​

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