SAR Clocks Other developments
● RbXO and TMXO in mid 1980s never completed
･ SeaScan Pierre Tullier, hybrid RbXO 10mW temperature calibrated XO Rb on 4 times/day 200mW net initial tests complete, stability better than 10-9 future?
● Ce 350mW 1-inch cube 1 x 10-10 may be possible to get a demo version next year?
● Recommend :
･ Set up temperature controlled test facility
･ Design SAR assuming clock will change
･ Use MCXO now (1 month bench test -2 x 10-9/year)
･ Pursue Ce
SAR Controller/storage
● Tattletale7 (Onset) NOAA(Fox) built own disc interface
● Tattletale8 can add CompactFlash (CF), 7-12V, MC68332, Cornell made IDE disc interface
● CARD-PC 486SXSF ultra low power 2W max, ＜5mW suspend, 4Mbyte RAM,
● BigIDEAdatalogger CF1 (Persistor, John Godley) 3V, MC68338, 1Mbyte RAM, up to 48Mbyte CF, variable power, to 16MHz, good support
● IDE 8Gbyte disc intertace (inexpensive), can daisy chain, buffering optimized being developed for NOAA first prototype delivered. 16-bit 4-channel A/D
SAR Navigation System
● Acoustic release, transpond, mooring motion, time latch
● Make modular, minimize connections to rest of SAR
● Need low power detect circuit
● Use one reply, multiple interrogate
● Use burn wire or explosive bolt
● Deck box must be simple
● Time latch ontranspond interrogations
● Separate batteries for detect/release
SAR Other boards/functions
● Amplifier, filter how variable/controllable?
● A/D want 16bit
● D/A for source signal
● Need sample clock frequency synthesis
● Power supply DC-DC converters
