Abstract
A Data Processing Module (DPM) has been developed to provide data reduction through real-time, in-situ processing of Acoustic Doppler Current Meter (ADCM} data. This enables the transmission of ADCM data from remote locations via satellite, despite the low throughput of existing telemetry systems and the high data volume of ADCM's. The DPM was designed for reliability and low power. A DPM-enhanced ADCM can be easily interfaced to buoy systems or instrument packages over an EIA-485 serial link. The DPM was developed for use in an Ice-Ocean Environmental Buoy (IOEB), an Arctic drifting buoy with a large suite of subsurface instruments, a meteorol og i cal package, two buoy control 1 ers, and a pair of ARGOS satellite transmitters housed in the surface floatation element. The IOEB was designed for extended deployments in the pack ice. The long deployment duration and limited buoy recovery opportunities dictated the use of sate1 1 ite telemetry to ensure timely data acquisition. The limited ARGOS system throughput necessitated reduction of the ADCM data by a factor of about 170: 1. The DPM can be easily interfaced to buoy systems because it communicates over a standard EIA-485 link and its intelligence is derived from firmware written in C and therefore easily modified. The EIA-485 communication is implemented with the SAIL (l) software protocol which allows a variety of
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