DIGITAL DATA ACQUISITION SYSTEM OF THE JAPANESE ANTARCTIC RESEARCH AIRCRAFT PILATUS PORTER PC-6

摘要

Digital Data Acquisition System of the Japanese Antarctic Research aircraft (JARDAS) was developed and installed on Pilatus Porter PC-6. JARDAS consists of 8 interfaces with the external navigational and observational devices, data processor and data cartridge. As for the 4 channels of analog devices, DC voltage outputs from the radar altimeter, atmospheric pressure transducer, thermometer and vertical-gyro system are analog-to-digital converted in the data processor. As for the 4 channels of digital devices, data from the ULF/omega receiver, GPS receiver, proton magnetometer and ice radar video pulse digitizer are selected, code-transformed and re-arranged to make one data block sequence. The one data block corresponds to 1s sampling data, and consists of 1 byte of start mark, 150 bytes of 7-bit with even parity ASCII data for navigational and geomagnetic total intensity data, 658 bytes of binary data for ice radar video pulse waveform 1 and 2 bytes of end mark, which amounts to a total of 811 bytes. JARDAS can record 12 hrsu27 output data blocks continuously on one 450ft (7700 bpi) 3-M type cartridge tape.