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MBARI's Buoy Based Seafloor Observatory Design (PDF) MBARI’s Buoy Based Seafloor Observatory Design Mark Chaffey, Larry Bird, Jon Mike Kelley, Lance McBride, Tom O’Reilly, Walter Paul*, Erickson, John Graybeal, Andy Ed Mellinger, Tim Meese, Mike Risi, and Wayne Hamilton, Kent Headley, Radochonski Monterey Bay Aquarium Research Institute * Dept. of Applied Ocean Physics and Engineering 7700 Sandholdt Road Woods Hole Oceanographic Institution Moss Landing CA 95039 Woods Hole, MA 02543 Abstract - There has been considerable discussion and planning in the oceanographic community toward the installation of long-term seafloor sites for scientific observation in the deep ocean. The Monterey Bay Aquarium Research Institute (MBARI) has designed a portable mooring system for deep ocean deployment that provides data and power connections to both seafloor and ocean surface instruments. The surface mooring collects solar and wind energy for powering instruments and transmits data to shore-side researchers using a satellite communications modem. A specialty anchor cable connects the surface mooring to a network of benthic instrumentation, providing the required data and power transfer. Design details and results of laboratory and field testing of the completed portions of the observatory system are described. I. INTRODUCTION Fig. 1 Buoy and seafloor network. MBARI has undertaken a major effort to develop the technology and techniques for building deep ocean of reliability, fault tolerance, and remote diagnostic seafloor observatories under the in-house Monterey capability. Ocean Observing System (MOOS) program. A key The overall functional and design requirements of the component of the overall observatory technology effort is MOOS mooring have previously been described in detail a moored surface buoy connected to the seafloor using [1] and can be summarized as a portable system, an anchor cable that incorporates mechanical strength configurable to a wide range of experiments, providing elements, copper conductors for power transfer, and episodic event response using on-board processing, and optical elements for communications. The complete deployable and maintainable using common methods system is named the MOOS Mooring System and is and tools in waters up to 4000 meters deep. These broad shown in fig. 1. Benthic instrument nodes (BINS) are requirements were incorporated into and drove the connected to the base of the mooring using a lightweight detailed design of each of the mooring’s mechanical, bottom lay cable that is installed using a Remotely electrical and software subsystems. Operated Vehicle (ROV) with a cable laying toolsled We are currently field testing the mooring system attachment. design at several locations off the California coast. A major goal of the MOOS mooring observatory development has been to address several key areas that II. SYSTEM ARCHITECTURE will enable the deployment of economical buoy-based deep ocean observatories. The greatest challenge is addressing the survivability of the mooring riser cable. A A. System Block Diagram significant investment is also directed at solving the “instrument interface problem”. As major infrastructure The overall system architecture is illustrated in fig. 2. projects, seafloor observatories must provide a flexible The system is partitioned into the “deployed” or at-sea instrument interface that allows efficient introduction of and the “shoreside” or land based components. The new instruments and sensors that are often installed after functional building block of the deployed system is a the system infrastructure is in place. In the specific case MOOS mooring controller (MMC) that acts as a node on of a seafloor instrument, the physical interface “plug-in” is the mooring network and contains all of the instrument difficult to access and can only be modified or repaired and infrastructure input/output and local data logging remotely though the telemetry system, or accessed functions. To provide system expandability, multiple physically with limited tools such as ROV manipulator MMC’s are networked together to increase the number of arms. The remoteness of the deployment locations and instrument port connections. Identical MMC’s are the expense of installation and service argues strongly installed on the surface float as well as in each seafloor for a generic instrument interface and a very high degree mounted Benthic Instrument Node (BIN) in the system. 1 Fig. 2 MOOS Mooring System Block Diagram The MMC nodes are networked together using hardware assistance for power management of the standard TCP/IP protocols over 10BASE-T, 10BASE-F or processor, and good embedded Linux support. A surface EIA-422 on copper media operating at 38.4kbits/sec. mount printed circuit board was developed named Each networking media is applicable to a specific SideARM containing the processor, 16MB Flash, 64 MB application in the network. For example, the long runs SDRAM supporting memory, a Compact Flash socket, from the surface to the seafloor and from BIN to BIN can 10BASE-T Ethernet interface, and 16 asynchronous reach 10 kilometers and use 10BASE-F. Runs within a UARTs used to interface to external RF communications single housing use 10BASE-T, and short surface and devices and science instruments. Communications with Benthic runs use EIA-422 to eliminate the cost and the other cards in the system are over a point-to-point complexity of optical connectors. To save power the Serial Peripheral Interface (SPI) bus. A small on-board MMC main processor is placed in “sleep” mode Texas Instruments MSP430 processor continually whenever possible. Traffic from other MMC nodes on the monitors environmental parameters, such as in-housing network on either 10BASE-T or EIA-422 media generates temperature, pressure, humidity, and system 12 Volt bus a processor wake-up interrupt. ground fault current. The MSP430 can wake the main Each MMC acts as host for the deployed system processor, if it is in a low-power mode, to indicate that a applications software (Software Infrastructure and particular parameter is outside of a configurable range. Applications for MOOS or SIAM) that controls all The Dual Port Adapter (DPA) card provides isolated instrument interface, communications and infrastructure serial device input/output functions and switched power functions. for two out-of-housing instruments per card. In order to meet the requirement for fault detection and fault B. MOOS Mooring Controller (MMC) tolerance each I/O port has fully galvanically isolated communications and a high current relay/FET The MMC is based around a backplane and cardset combination for power switching up to 12 Amperes. that conform to the WHOI IBC standard [2]. This Current is monitored locally and a settable level over- mechanical specification was chosen because it is well current trip function protects the system from individual documented, compact enough to fit in a 15.24cm (6 inch) instrument faults. Ground faults are detected on the 12 internal diameter housing and MBARI has pre-existing Volt bus and isolated by “walking the tree”, i.e. using the stock of the main chassis extrusions. Four separate DPA interface to shut down individual instruments or function cards make up the system. downstream nodes until the fault is isolated. The main processing controller utilizes an Intel The Radio Frequency Input/Output (RFIO) card StrongARM SA1110 32 bit processor which was chosen performs similar fault detection and isolation functions for because it provides powerful computing power, the primary and secondary radio interfaces and the incorporates a rich mix of on-chip peripherals, has pager-reset function. The optical network controller, or 2 Medusa card, is also a custom designed hardware platform. A COTS design was not found that met the requirements of supporting both fiber optic and standard copper interfaces in a small efficient package while providing full remote diagnostics and fault tolerance with line-to-line fail-over capability. In addition, we required low power operation. The core of the card is a level II Ethernet switch chip [3] implemented with four fiber and two copper interfaces. A dedicated ARM processor [4] is incorporated for initial switch configuration and management of the diagnostic and fault response functions. The optical transmitter/receiver pairs are Small Form Factor Pluggable [5] (SFP) modules that incorporate built-in diagnostic and status reporting functions accessed over an I2C bus for measuring transmit and receive power, laser bias and other important performance metrics [6]. Incorporating standardized SFP modules in the design allows easy optical configuration for coarse and standard wave division multiplexing and multi-vendor sourcing. The Medusa card operates independently from the host processor and switches traffic between observatory Fig. 3 Puck attached to COTS instrument. nodes without having to “wake-up” the local host. To conserve power, individual ports are shut down when not connected into a network. More aggressive power saving always attached logically and physically to its associated methods are planned in the future, for example turning off instrument, as in fig. 3. When the instrument service and all laser transmitters unless there is traffic pending. metadata have been retrieved by the local host and executed, the metadata is attached to the instrument's data stream. Subsequent operations such as local data C. MMC Operating System Software store, transport and archival on shore occur without Linux (kernel version 2.4.9) is used to provide
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