Ashtech and Trimble Choke Ring SNR Analysis Mike Jackson Ph.D. UNAVCO Network Operations Manager 3340 Mitchell Lane, Boulder CO 80301   Introduction The Trimble 4000 receiver is obsolete and the Ashtech Z12 is nearing the end of its product... Read More

TRIMBLE CHOKE RING ANTENNA MEAN PHASE CENTER CALIBRATION J. Braun, B. Stephens, O. Ruud and C. Meertens University NAVSTAR Consortium, Boulder, CO 21 August 1996 Abstract The consistency of the phase center offsets of GPS antennas is important... Read More

Location: UNAVCO facility roof NE corner Author: Henry Berglund Contact: Berglund@unavco.org Introduction: Trimble currently offers two choke ring antenna designs for GNSS applications: The Trimble GNSS Choke Ring Antenna has a traditional Dorne... Read More