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　　Alternative names for TRX32:

　　TRX32 Input/Output Unit

　　TRX32 Marine Transceiver

　　TRX32 PCB Module

　　The Kongsberg TRX32 is a core 32-channel, multi-frequency acoustic transceiver board for the Kongsberg Maritime HiPAP series of high-precision underwater acoustic positioning systems. Classified as a Line Replaceable Unit (LRU), it is compatible with the HiPAP 101/351/451/501 (X81 series) acoustic transceiver housings, allowing for channel capacity expansion by integrating up to eight TRX32 boards within a single cabinet. The board features a marine-grade conformal-coated PCB, a reinforced metal shielding cover, and an extraction latch. It performs underwater acoustic pulse transmission, echo acquisition, and digital signal preprocessing, providing the host positioning system with raw acoustic data—such as range and bearing—relative to underwater transponders. It serves as critical hardware in the underwater acoustic measurement chain of offshore dynamic positioning systems.

　　I. Operating Principle

　　The TRX32 board integrates 32 independent transmit channels and 32 receive channels, with each transmit-receive pair corresponding to a specific element in the transducer array. The operational workflow comprises three main components: the transmit chain, the receive chain, and digital processing/system synchronization.

　　Transmit Chain: The HiPAP master control computer sends acoustic pulse commands, encoding sequences, and operating frequency parameters to the TRX32 via Ethernet. The board's DSP and timing circuitry generate multi-frequency excitation pulse signals based on configuration settings; these signals pass through a power amplification circuit to drive the underwater transducer array, emitting ultrasonic pulses. An onboard high-capacity energy storage capacitor array ensures stable instantaneous transmission power. The board features two fuses (F1: 12V/4A; F2: 6V/4A) in the transmission circuit to provide overload protection and prevent damage to board components caused by transducer short circuits.

　　Reception Link: Weak acoustic echoes reflected from seafloor transponders or beacons are converted into analog electrical signals by the transducer and fed into the TRX32 reception channel. The signals first enter a low-noise pre-amplifier for amplification, followed by band-pass filtering to eliminate marine environmental noise and electromechanical interference from the vessel. Subsequently, a high-speed ADC digitizes the analog echo signals, performing sampling, decimation, and preliminary decoding to extract the transponder's encoded signal and propagation delay information.

　　Synchronization and Data Upload: The board receives the system's 20MHz master clock and an external "TXENABLE" trigger synchronization signal, ensuring strict timing alignment across multiple TRX32 boards and transducer arrays. Pre-processed digital acoustic measurement data is uploaded via the board's Ethernet interface to the HiPAP host unit. The host performs beamforming using multi-channel delay data to calculate the bearing, slant range, and 3D coordinates of underwater targets (such as ROVs, AUVs, subsea pipelines, and underwater structures). Finally, the data is fed into the vessel's K-Pos dynamic positioning system for closed-loop position calculations. The board's front panel includes indicators for Ethernet link status, data activity, and I/O status to facilitate real-time local diagnostics; it also provides a P4 external synchronization interface and P5/P7 debugging serial ports for engineering commissioning and external trigger connections.

       II. Application Fields and Scenarios

　　The TRX32 is designed exclusively for use with the Kongsberg HiPAP high-precision acoustic positioning system. It is primarily deployed on offshore oil and gas vessels and marine engineering vessels to provide underwater position references for Dynamic Positioning (DP) systems:

　　ROV/AUV Tracking and Positioning: Offshore vessels equipped with the HiPAP system utilize the TRX32 to drive transducers for real-time tracking of underwater robots (ROVs/AUVs), supporting operations such as subsea pipeline inspection, wellhead maintenance, and subsea installations.

　　Underwater Structure Monitoring: Positioning and monitoring of subsea pipelines, underwater pile foundations, and floating platform mooring lines using underwater transponders to determine the 3D positions of subsea facilities and monitor displacement and settlement.

　　Offshore Dynamic Positioning (DP): Drilling platforms, pipe-laying vessels, and heavy-lift vessels rely on HiPAP acoustic positioning as a position reference source for their DP systems. The TRX32 handles acoustic signal acquisition, ensuring the vessel maintains its position even in environments where GPS signals are unavailable.

　　Hydrographic Surveying and Marine Engineering Surveys: Measurement of underwater beacon arrays and calibration of seabed reference arrays, providing sub-degree bearing measurement capabilities to meet high-precision marine surveying requirements.

　　Equipment Maintenance and Spare Part Replacement: On-site repair of HiPAP systems; damaged TRX32 cards can be replaced directly without returning the entire unit to the factory, thereby minimizing offshore downtime.

　　III. Operating Procedures

　　Prerequisites: Strictly adhere to the Kongsberg HiPAP original equipment manufacturer (OEM) maintenance manual. Operations must be performed only by certified offshore equipment engineers. Hot-swapping (inserting or removing) cards is prohibited while the vessel is in DP operation mode, except in emergencies.

　　(I) Card Removal Procedure

　　System Preparation: Notify the DP operator to switch the HiPAP system to an alternative position reference source and isolate the relevant channels in the X81 transceiver cabinet. Turn off the power supply to the cabinet and wait for the card's energy-storage capacitors to fully discharge (observing the static discharge time specified by the OEM).Cable Removal: Disconnect all external cables attached to the board's front panel—including Ethernet, synchronization (P4), and debug serial ports (P5/P7)—and label the cables with their corresponding identifiers.

　　Unlocking and Extraction: Press the red release knobs on both sides of the board, operate the upper and lower ejector levers to disengage the board from the backplane slot, and slide the TRX32 board out steadily and horizontally; take care to avoid bumping the shielding cover or the capacitor array on the board.

　　Storage: Place the removed board into an anti-static bag and store it in a dry, shock-proof spare parts box; do not stack bare boards directly on top of one another.

　　(II) Board Installation Procedure

　　Anti-static Protection: Wear an anti-static wrist strap; verify that the spare part model is TRX32 and check the hardware version.

　　Rail Alignment: Slide the board horizontally into the slot along the rack rails, ensuring the backplane connectors are aligned; press the ejector levers on both sides until the board is fully locked and the red locking latches reset.

　　Cable Reconnection: Reconnect the Ethernet, external synchronization, and debug interface cables in the order indicated by the labels.

　　DIP Switch Configuration: Configure the board ID address using the SW1 and SW2 DIP switches on the front panel; ensure that addresses do not conflict when multiple TRX32 boards are installed in the same chassis.

　　Power-up and Self-test: Power on the cabinet and observe the status of the power, Ethernet, and I/O indicators on the front panel; access the hardware diagnostics interface on the HiPAP host computer and perform board identification, channel self-tests, and transducer circuit tests.

　　System Calibration: After replacing the board, perform HiPAP acoustic channel gain and time-delay calibrations, verify that positioning data output is normal, and switch back to DP online mode.

    (III) Routine Online Operations

　　During normal system operation, engineers may only monitor the TRX32 status via the host computer—reading channel signal amplitudes, noise levels, board temperatures, supply voltages, and F1/F2 fuse statuses. Remote adjustment of transmit power, receive gain, and operating frequency parameters is permitted; however, modifying hardware DIP switch settings while the system is online is strictly prohibited.

　　IV. Precautions

　　1. Electrostatic Protection

　　The TRX32 integrates numerous precision semiconductor components (such as DSPs and ADCs) that are highly sensitive to static electricity. All disassembly, assembly, and testing operations must be performed while wearing a certified anti-static wrist strap and using a grounded workbench. Touching the pins, capacitors, or chip areas on the back of the board is prohibited. Anti-static packaging must be used throughout the transport and storage of spare parts; handling bare boards in high-static, dry environments is strictly forbidden. Electrostatic discharge (ESD) can cause latent component damage—faults may not be immediately apparent but can lead to failure following vibration caused by sea conditions.

　　2. Electrical Safety

　　The board contains high-capacity energy-storage capacitors that retain high voltage after power-off. You must wait for the specified discharge time after disconnecting power before removing the board to prevent electric shock or damage to the backplane interface caused by arcing.

　　Channel outputs must never be short-circuited while unloaded; damaged or short-circuited transducer cables can instantly burn out the board's transmit channels or blow the F1/F2 fuses. Always measure the insulation and impedance of transducer cables before performing maintenance.

　　The supply voltage must remain within the rated range specified on the nameplate. Fluctuations or surges in the ship's power grid can cause DSP reboots or hardware damage; the power protection module at the cabinet input must be inspected regularly.

　　3. Environmental and Mechanical Precautions

　　The board is a marine rack-mount LRU (Line Replaceable Unit). Although it features vibration resistance and protective coatings against salt spray and environmental hazards, it must not be removed from the cabinet and exposed to the humid, salt-laden air of the deck. Adequate ventilation must be maintained inside the cabinet, and dust filters must be cleaned regularly to prevent dust accumulation from causing the board to overheat. Insert and remove the card horizontally; do not tilt or use force to pry it, as this can bend the backplane connector pins. Do not remove the metal shielding cover, as it is crucial for suppressing electromagnetic interference affecting acoustic signals.

　　4. System and Configuration Risks

　　Within the same X81 chassis, DIP switch IDs for multiple TRX32 cards must not be duplicated; ID conflicts prevent the system from recognizing the cards and cause acoustic channel errors.

　　Channel calibration must be performed after replacing a card; putting the system online without doing so introduces ranging and bearing errors, leading to abnormal DP positioning and compromising vessel operational safety.

　　The card is a core safety-critical component of the HiPAP system; the use of non-original firmware or third-party modifications is strictly prohibited, as incorrect firmware flashing can render the card unusable.

　　5. Fault and Spare Parts Management

　　Diagnose card faults via the host computer first to distinguish between issues with the card itself, the transducer, the cable, or the backplane; do not replace the card blindly.

　　Control temperature and humidity in spare parts storage to avoid high temperatures and condensation; different hardware versions of the TRX32 cannot be used interchangeably, so version numbers must be verified when purchasing spares.

　　When returning a faulty card, retain the original shielding cover and anti-static packaging, keep a record of the fault, and submit it to Kongsberg for official repair assessment.

　　6. Operational Safety Management

　　During vessel DP operational windows, hot-swapping is prohibited unless the card has completely failed. Before performing card maintenance, obtain a work permit, notify the central control room and DP operators, and ensure a redundant switchover of position references to prevent vessel drift accidents caused by the loss of acoustic positioning.

　　V. Summary

　　The TRX32 serves as the signal transceiver core of the HiPAP acoustic positioning system. By utilizing 32-channel multi-frequency signal generation, acquisition, and digital pre-

processing, it enables high-precision acoustic ranging and bearing determination for underwater transponders, supporting offshore dynamic positioning and underwater target tracking. This circuit board is a piece of high-precision marine acoustic hardware; its operation and maintenance must strictly adhere to protocols regarding anti-static measures, discharge procedures, and system calibration. In the harsh operating conditions found at sea, proper cabinet maintenance, standardized installation and removal procedures, and rigorous version control of spare parts are essential to ensuring the continuous and reliable operation of the HiPAP system.

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