Ocean magnetometer data long-distance transmission control circuit

Abstract

The invention discloses a long-distance data transmission control circuit of an ocean magnetometer. The near-end part and the far-end part both comprise an MCU circuit used for logic control and data caching, a power supply circuit used for supplying power to the circuit, and a carrier circuit used for signal modulation and analysis. The data acquisition terminal is connected with the near-end MCU circuit through an RS232 serial port, and provides a 24v power supply for the near-end power supply circuit through a power adapter; the near-end power supply circuit provides a 24v power supply for the far-end power supply circuit through a long-distance two-core cable. The near-end carrier circuit and the near-end MCU circuit are connected through an RS232 serial port, the far-end carrier circuit and the far-end MCU circuit are connected through an RS232 serial port, and the near-end carrier circuit and the far-end carrier circuit carry out signal transmission through a long-distance two-core cable. The number of the cable cores of the trailing cable is reduced to two, the cost of the trailing cable is reduced, the cable diameter and the weight of the cable are reduced, and the cable is more convenient to lay and recycle; and the requirements of the modern automation and information technology fields on long-distance data transmission are better met.

Description

Technical Field

[0001] The present invention relates to the technical field of long-distance transmission of marine geophysical data, and particularly to a long-distance transmission control circuit for marine magnetometer data. Background Art

[0002] Since the 21st century, with the deepening dependence of the global economy and national defense security on marine resources and subsea facilities, the ocean has become an important strategic space for countries to compete. China is extremely rich in marine resources, which provide support for economic growth in many aspects such as industry, fishery, and tourism. In this context, the construction and maintenance of infrastructure such as subsea communication, power transmission, pipeline construction, and offshore wind power are particularly crucial. However, the subsea environment is complex and changeable, and affected by various factors such as marine geological movements, ocean currents, sediment accumulation, marine biological activities, and human interference, once a subsea facility fails, the economic losses and potential safety hazards are often extremely serious. The detection and maintenance tasks of subsea facilities are becoming increasingly onerous, and practitioners urgently need efficient and accurate detection technologies to ensure their long-term stable operation. Magnetic detection technology, with its unique advantages, has become an important method for underwater detection.

[0003] Magnetic detection technology relies on the Earth's inherent magnetic field and the response of the target object in this magnetic field. It does not need to rely on external light sources or active signal transmissions, and its signal comes from the magnetic anomaly generated by the magnetization of the target. This characteristic enables magnetic detection to exhibit extremely high stability and adaptability in extreme environments. Even in turbid, low-light or even completely lightless environments, magnetic detection can still capture weak magnetic anomaly signals through highly sensitive magnetic sensors.

[0004] However, at present, the long-distance transmission of data from marine magnetometers, especially towed marine magnetometers, mostly relies on the RS485 protocol to complete long-distance transmission. In addition to RS485 communication, the magnetometer also needs to be powered during normal operation. Such a tow cable requires at least 4 wire cores (2 for power supply and 2 for transmitting signals) to be composed. To reduce the cost of the tow cable, the present invention proposes a long-distance transmission control circuit for marine magnetometer data, which uses the principle of DC carrier to build a long-distance transmission control circuit, reducing the wire cores of the tow cable to 2 (only two power supply wires). While reducing the cost of the tow cable, it also reduces the wire diameter and weight of the cable, making the cable more convenient to lay and recover. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a long-distance transmission control circuit for marine magnetometer data to solve the problems raised in the background art.

[0006] The control circuit of the present invention includes a proximal part and a distal part. Both the proximal part and the distal part include an MCU circuit for logic control and data caching, a power supply circuit for powering the circuit, and a carrier circuit for signal modulation and demodulation.

[0007] The data acquisition terminal is connected to the proximal MCU circuit through the RS232 serial port and provides a 24V power supply for the proximal power supply circuit through a power adapter; the proximal power supply circuit provides a 24V power supply for the distal power supply circuit through a long-distance two-core cable.

[0008] The proximal power supply circuit converts the 24V power supply into a 12V power supply through a DC-DC module to power the proximal carrier circuit; the proximal power supply circuit converts the 12V power supply into a 5V power supply through a low-dropout linear regulator, and then converts the 5V power supply into a 3.3V power supply through a low-dropout positive voltage regulator to power the proximal MCU circuit. The proximal carrier circuit and the proximal MCU circuit are connected through the RS232 serial port.

[0009] The distal power supply circuit converts the 24V power supply into a 5V power supply through a DC-DC module to power the distal carrier circuit; the distal power supply circuit converts the 5V power supply into a 3.3V power supply through a low-dropout positive voltage regulator to power the distal MCU circuit. The distal MCU circuit is connected to the marine magnetometer through the RS232 serial port, and the distal power supply circuit provides a 24V power supply for the marine magnetometer. The distal carrier circuit and the distal MCU circuit are connected through the RS232 serial port.

[0010] The proximal carrier circuit and the distal carrier circuit transmit signals through a long-distance two-core cable.

[0011] Preferably, the proximal power supply circuit selects the TPS5430 buck converter produced by TI to convert the 24V power supply into a 12V power supply to power the proximal carrier circuit; the HT7150 low-dropout linear regulator produced by UWM is used to convert the 12V power supply into a 5V power supply, and then the 117-3.3 low-dropout positive voltage regulator produced by AMS is used to convert the 5V power supply into a 3.3V power supply to power the proximal MCU circuit.

[0012] Preferably, the distal power supply circuit selects the TPS5430 buck converter produced by TI to convert the 24V power supply into a 5V power supply to power the distal carrier circuit; the distal power supply circuit selects the 117-3.3 low-dropout positive voltage regulator produced by AMS to convert the 5V power supply into a 3.3V power supply to power the distal MCU circuit.

[0013] Preferably, the proximal carrier circuit selects the EV620 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd. to achieve power supply, communication, and fault monitoring at the proximal end.

[0014] Preferably, the remote carrier circuit uses the PB331 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd., which meets the requirements of remote power supply and communication.

[0015] Preferably, both the proximal MCU circuit and the remote MCU circuit use the STM32F103 series single-chip microcomputer.

[0016] The data long-distance transmission method of the marine magnetometer data long-distance transmission control circuit described in claim 1 is specifically as follows: when collecting magnetic field data, the remote MCU circuit communicates with the marine magnetometer through the RS232 serial port. The magnetometer sends the measured magnetic field data to the remote MCU circuit unit through the RS232 serial port. After the remote MCU circuit unit caches the data, it sends the data to the remote carrier circuit unit through the RS232 serial port. The remote carrier circuit modulates the serial port signal and sends it to the proximal carrier circuit through a long-distance two-core cable. The proximal carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the proximal MCU circuit. The proximal MCU circuit sends the data collected by the magnetometer to the data acquisition terminal through the RS232 serial port.

[0017] When sending a control instruction, the data acquisition terminal sends the control instruction to the proximal MCU circuit through the RS232 serial port. The proximal MCU circuit caches the data and sends the data to the proximal carrier circuit through the RS232 serial port. The carrier circuit modulates the serial port signal and sends it to the remote carrier circuit through a long-distance two-core cable. The remote carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the remote MCU circuit. The remote MCU circuit caches the control instruction and sends it to the marine magnetometer through the RS232 serial port.

[0018] The modulation is: the carrier circuit modulates the serial port signal into an AC signal and superimposes it on the power supply line. The demodulation is: when there is an AC signal on the power supply line, the carrier circuit demodulates the signal into a serial port signal, and the power supply line supplies power to the inductor.

[0019] Compared with the prior art, the beneficial effects of the present invention are: power supply and signal transmission can be realized on the power supply line through the carrier circuit, without the need to additionally set signal transmission lines, simplifying the wiring structure and reducing costs; adopting the above solution, the maximum bus voltage is 48v, supporting long-distance communication (up to 3000m), and having strong anti-interference ability. The number of cores of the tow cable can be reduced to 2, greatly reducing the cost of the tow cable, and also reducing the cable diameter and weight of the cable, making the cable more convenient to lay and recover. Through this design, it can better meet the requirements of the modern automation and information technology fields for long-distance data transmission, especially in those application scenarios with extremely high requirements for speed, accuracy, and flexibility. Description of the Drawings

[0020] Figure 1 This is the overall structural block diagram of the present invention; Figure 2 This is the circuit diagram of the proximal power supply circuit in the embodiment; Figure 3 This is the circuit diagram of the distal power supply circuit in the embodiment; Figure 4 This is the circuit diagram of the proximal carrier circuit in the embodiment; Figure 5 This is the circuit diagram of the distal carrier circuit in the embodiment; Figure 6 This is the circuit diagram of the proximal and distal MCU circuits in the embodiment. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the invention. The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0022] As Figure 1 shown, a long-distance data transmission control circuit for a marine magnetometer includes a proximal part and a distal part. Both the proximal part and the distal part include an MCU circuit for logic control and data caching, a power supply circuit for powering the circuit, and a carrier circuit for hybrid modulation and demodulation of data and power supply.

[0023] The data acquisition terminal is connected to the proximal MCU circuit through an RS232 serial port, and provides a 24V power supply for the proximal power supply circuit through a power adapter; the proximal power supply circuit provides a 24V power supply for the distal power supply circuit through a long-distance two-core cable.

[0024] The proximal power supply circuit converts the 24V power supply into a 12V power supply through a DC-DC module to power the proximal carrier circuit; the proximal power supply circuit converts the 12V power supply into a 5V power supply through a low dropout linear regulator (LDO), and then converts the 5V power supply into a 3.3V power supply through a low dropout regulator to power the proximal MCU circuit. The proximal carrier circuit and the proximal MCU circuit are connected through an RS232 serial port.

[0025] The distal power supply circuit converts the 24V power supply into a 5V power supply through a DC-DC module to power the distal carrier circuit; the distal power supply circuit converts the 5V power supply into a 3.3V power supply through a low dropout regulator to power the distal MCU circuit. The distal MCU circuit is connected to the marine magnetometer through an RS232 serial port, and the distal power supply circuit provides a 24V power supply for the marine magnetometer. The distal carrier circuit and the distal MCU circuit are connected through an RS232 serial port.

[0026] The proximal carrier circuit and the distal carrier circuit transmit signals through a long-distance two-core cable.

[0027] During use, after the proximal MCU circuit and the distal MCU circuit are powered on, the serial ports at both ends are initialized.

[0028] When collecting magnetic field data, the distal MCU circuit communicates with the marine magnetometer through the RS232 serial port. The magnetometer sends the measured magnetic field data to the distal MCU circuit unit through the RS232 serial port. After the distal MCU circuit unit caches the data, it sends the data to the distal carrier circuit unit through the RS232 serial port. The distal carrier circuit modulates the serial port signal and sends it to the proximal carrier circuit through a long-distance two-core cable. The proximal carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the proximal MCU circuit. The proximal MCU circuit sends the data collected by the magnetometer to the data acquisition terminal through the RS232 serial port.

[0029] When sending control instructions, the data acquisition terminal sends the control instructions to the proximal MCU circuit through the RS232 serial port. The proximal MCU circuit caches the data and sends the data to the proximal carrier circuit through the RS232 serial port. The carrier circuit modulates the serial port signal and sends it to the distal carrier circuit through a long-distance two-core cable. The distal carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the distal MCU circuit. The distal MCU circuit caches the control instructions and sends them to the marine magnetometer through the RS232 serial port.

[0030] The modulation is as follows: The carrier circuit modulates the serial port signal into an AC signal and superimposes it on the power supply line. The demodulation is as follows: When there is an AC signal on the power supply line, the carrier circuit demodulates the signal into a serial port signal, and the power supply line supplies power to the inductor.

[0031] As Figure 2 shown, in this embodiment, the proximal power supply circuit selects the TPS5430 buck converter produced by TI to convert the 24V power supply into a 12V power supply to supply power to the proximal carrier circuit; the proximal power supply circuit uses the HT7150 low-dropout linear regulator produced by UWM to convert the 12V power supply into a 5V power supply, and then uses the 117-3.3 positive low-dropout voltage regulator produced by AMS to convert the 5V power supply into a 3.3V power supply to supply power to the proximal MCU circuit.

[0032] As Figure 3As shown, in this embodiment, the TPS5430 step-down converter produced by Texas Instruments is selected to convert the 24V power supply into a 5V power supply to power the remote carrier circuit; the remote power supply circuit selects the 117-3.3 low-dropout positive voltage regulator produced by AMS to convert the 5V power supply into a 3.3V power supply to power the remote MCU circuit.

[0033] As Figure 4 and 5 As shown, in this embodiment, the EV620 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd. is selected for the proximal carrier circuit to achieve power supply, communication and fault monitoring at the proximal end. The PB331 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd. is selected for the remote carrier circuit to meet the requirements of remote power supply and communication. Through the carrier circuit, power supply and signal transmission can be realized on the power supply line without the need to set up additional signal transmission lines, simplifying the wiring structure and reducing costs; adopting the above solution, the maximum bus voltage is 48V, supporting long-distance communication (up to 3000m) with strong anti-interference ability.

[0034] The STM32F103 series of microcontrollers have 6 different package types from 36 pins to 100 pins, and the microcontrollers with different peripherals can be configured according to the selected devices. In this embodiment, both the proximal MCU circuit and the remote MCU circuit select the STM32F103 series, medium-capacity and high-performance microcontroller chips, which integrate a high-performance Arm Cortex-M3 32-bit RISC core with a working frequency of 72 MHz, high-speed embedded memories (up to 128 KB of Flash memory and 20 KB of SRAM memory), and a large number of enhanced I / Os and peripherals connected to 2 APB buses. All microcontrollers in this series provide 2 12-bit ADCs, 3 16-bit general-purpose timers, 2 PWM timers, and standard and advanced communication interfaces: up to 2 I2Cs and SPIs, 3 USARTs, 1 USB, and 1 CAN.

[0035] The working voltage of this series of microcontrollers is 2.0 V to 3.6 V, and the working temperature range is from -40 °C to +85 °C, which can be extended to -40 °C to +105 °C; and this series of microcontrollers has a low-power mode, enabling low-power applications.

[0036] As Figure 6As shown, in this embodiment, the STM32F103C8T6 single-chip microcomputer is taken as an example. The single-chip microcomputer has a low power consumption mode. The data cache and instruction conversion program are downloaded to the EEPROM by the PC in a serial manner through the JTAG interface, and can also be directly loaded into the STM32F103C8T6 to improve the debugging speed; the SCK and IO of the JTAG downloader and the STM32F103C8T6 are connected together respectively. In the download stage, the driver download program provided by the keil editor is burned from the IO of the JTAG downloader into the EEPROM of the STM32F103C8T6.

[0037] The technical solution of the present invention is described above in conjunction with specific implementation methods, but it should be noted that the above descriptions are only for explaining the solution of the present invention and cannot be interpreted in any way as a specific limitation on the scope of protection of the invention. Based on the explanation here, those skilled in the art can think of other specific implementation methods or equivalent replacements of the present invention without creative work, and they will all fall within the scope of protection of the present invention.

Claims

1. A long-distance transmission control circuit for marine magnetometer data, comprising a proximal part and a distal part, characterized in that: Both the proximal part and the distal part include an MCU circuit for logic control and data caching, a power supply circuit for powering the circuit, and a carrier circuit for signal modulation and demodulation; The data acquisition terminal is connected to the proximal MCU circuit through the RS232 serial port and provides a 24V power supply for the proximal power supply circuit through a power adapter; the proximal power supply circuit provides a 24V power supply for the distal power supply circuit through a long-distance two-core cable; The proximal power supply circuit converts the 24V power supply into a 12V power supply through a DC-DC module to power the proximal carrier circuit; the proximal power supply circuit converts the 12V power supply into a 5V power supply through a low-dropout linear regulator, and then converts the 5V power supply into a 3.3V power supply through a low-dropout positive voltage regulator to power the proximal MCU circuit; the proximal carrier circuit and the proximal MCU circuit are connected through the RS232 serial port; The distal power supply circuit converts the 24V power supply into a 5V power supply through a DC-DC module to power the distal carrier circuit; the distal power supply circuit converts the 5V power supply into a 3.3V power supply through a low-dropout positive voltage regulator to power the distal MCU circuit; the distal MCU circuit is connected to the marine magnetometer through the RS232 serial port, and the distal power supply circuit provides a 24V power supply for the marine magnetometer; the distal carrier circuit and the distal MCU circuit are connected through the RS232 serial port; The proximal carrier circuit and the distal carrier circuit perform signal transmission through a long-distance two-core cable.

2. The long-distance transmission control circuit for marine magnetometer data as described in claim 1, characterized in that: The proximal power supply circuit selects the TPS5430 buck converter produced by TI to convert the 24V power supply into a 12V power supply to power the proximal carrier circuit; the HT7150 low-dropout linear regulator produced by UWM is used to convert the 12V power supply into a 5V power supply, and then the 117-3.3 low-dropout positive voltage regulator produced by AMS is used to convert the 5V power supply into a 3.3V power supply to power the proximal MCU circuit.

3. The long-distance transmission control circuit for marine magnetometer data according to claim 1, wherein: The distal power supply circuit selects the TPS5430 buck converter produced by TI to convert the 24V power supply into a 5V power supply to power the distal carrier circuit; the distal power supply circuit selects the 117-3.3 low-dropout positive voltage regulator produced by AMS to convert the 5V power supply into a 3.3V power supply to power the distal MCU circuit.

4. The long-distance transmission control circuit for marine magnetometer data according to claim 1, characterized in that: The proximal carrier circuit selects the EV620 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd. to realize power supply, communication and fault monitoring at the proximal end.

5. The long-distance transmission control circuit for marine magnetometer data according to claim 1, characterized in that: The distal carrier circuit selects the PB331 carrier chip produced by Beijing Qianglian Communication Technology Co., Ltd. to meet the requirements of distal power supply and communication.

6. The long-distance transmission control circuit for marine magnetometer data according to claim 1, characterized in that: Both the proximal MCU circuit and the distal MCU circuit select the STM32F103 series single-chip microcomputer.

7. The data long-distance transmission method of the marine magnetometer data long-distance transmission control circuit according to claim 1, characterized in that: Specifically: When collecting magnetic field data, the remote MCU circuit communicates with the marine magnetometer through the RS232 serial port. The magnetometer sends the measured magnetic field data to the remote MCU circuit unit through the RS232 serial port. After the remote MCU circuit unit caches the data, it sends the data to the remote carrier circuit unit through the RS232 serial port. The remote carrier circuit modulates the serial port signal and sends it through a long-distance two-core cable to the proximal carrier circuit. The proximal carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the proximal MCU circuit. The proximal MCU circuit sends the data collected by the magnetometer to the data acquisition terminal through the RS232 serial port; When sending control instructions, the data acquisition terminal sends the control instructions to the proximal MCU circuit through the RS232 serial port. The proximal MCU circuit caches the data and sends the data to the proximal carrier circuit through the RS232 serial port. The carrier circuit modulates the serial port signal and sends it through a long-distance two-core cable to the remote carrier circuit. The remote carrier circuit demodulates the transmitted modulated signal into an RS232 serial port signal and sends it to the remote MCU circuit. The remote MCU circuit caches the control instructions and sends them to the marine magnetometer through the RS232 serial port; The modulation is that the carrier circuit modulates the serial port signal into an AC signal and superimposes it on the power supply line; the demodulation is that when there is an AC signal on the power supply line, the carrier circuit demodulates the signal into a serial port signal, and the power supply line powers the inductor.

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