| Description |
United States Geological Survey, Menlo Park, California. Chief Scientists: Ed Clifton, Rick Starr. Geological data (beamtrawl, crabpot, sediment grab sampler, bubblepulser, sidescansonar, GPS, rangerange, magnetics, integratednavigation, LoranC, RhoRho, vibralift, vibratingcore, ottertrawl) of field activity A-1-90-WO in Gold Beach-Cape Blanco, Oregon from 09/21/1990 to 10/03/1990 |
| Comments |
The navigational system used on the R/V ALOHA cruise, A1-90-WO, was an IBM 386 PC based system using inputs from an ASHTECH (MODEL #) gps receiving unit and a DECCA 540 delnorte transponder ranging system. Delnorte was used for the majority of the cruise because of its higher degree of positioning accuracy being replaced by gps only when the ship was out of range of the land based transponder stations or in areas of poor station geometry, i.e. along baselines between stations. The positioning accuracy of the delnorte system is about ____ when three or more of the stations are being used for the ranging calculations, and that of gps about ___________, but can be up to 100 meters when selective availability (errors introduced into the gps signal by the defense department) is implemented. Both systems calculate ranges by using electromagnetic signals. The travel times from the signals are converted into distances and used to determine the ships position. GRAIG, I wasnt sure about the accuracy of the systems at their best, that is why there are blanks. Also wasnt sure about the model # of the Ashtech.
Staff information imported from InfoBank
Bob O'Brien (PSU) - Biologist
Bob Shermer - Ship Captain
Bob Woolsey (Univ of Miss.) - Geologist
Cheryl Mardock (USBM) - Geologist
Curt Peterson (PSU) - Geophysicist
Dave Fox (ODFW) - Biologist
Dave Hogg (USGS Western Region) - Electronics Technician
Ed Clifton (USGS Western Region) - Chief Scientist
Gerry Connard (NW Geo.) - Geologist
Graig McHendrie (USGS Western Region) - Navigator
Greg McMurray (DOGAMI) - Biologist
Joe Fisher (OSU) - Biologist
Jose Garcesto - Chief Mate
Mike Hamer (USGS Western Region) - Navigator
Monty Simmons (Univ of Miss) - Geologist
Nestor Verdugo - Chief Engineer
Rick Starr (ODFW) - Chief Scientist
Rusty Tarver (Univ of Miss) - Geologist
Walter O'Niell (Univ of Miss) - Geologist |
