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GNSS Antenna Sensitivity to Site Dependent Error Sources
Viewed 84776 times since Thu, Jan 31, 2013
GNSS Antenna Phase Center Stablity Test - TPSPG_A1+GP Background Topcon TPSPG_A1+GP Campaign Height Measurement Bias Problems were reported by Bob King, Adrian Borsa and other investigators regarding height estimate biases introduced when using... Read More
GNSS Antenna Signal to Noise Comparison
Viewed 43553 times since Wed, Nov 26, 2014
This article presents a comparison of measured signal to noise ratio (SNR) values observed from several  GNSS antenna types. The results presented below were collected using a monument located on the UNAVCO Facility Roof in Boulder, CO. Each test... Read More
Custom Cavity-Type Notch Filter for Mitigating GPS/GNSS Interference from Iridium Data Transmitters
Viewed 42785 times since Mon, Oct 24, 2011
The Iridium satellite communication system uses the 1616-1626.5 MHz band to uplink with orbiting communication satellites. UNAVCO Inc. uses iridium communication links to download GPS data from remote GPS stations located at high latitudes. The L1... Read More
Iridium & GPS/GNSS Inteference from Iridium Data Transmitters
Viewed 18516 times since Mon, Oct 24, 2011
Update: GPS/GNSS Interference From Iridium Data TransmissionsThe Iridium satellite communication system broadcasts in the 1610 to 1626.5 MHz band. UNAVCO Inc. uses iridium communication links to download GPS data from remote GPS stations. The L1 freq... Read More
Ashtech and Trimble Choke Ring SNR Analysis (2001)
Viewed 7518 times since Wed, Mar 24, 2010
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Ph.D. UNAVCO Network Operations Manager 3340 Mitchell Lane, Boulder CO 80301   Introduction The Trimble 4000 receiver is obsolete and the Ashtech Z12 is nearing the end of its product lifespan... Read More
Trimble TRM59900 Ti-Choke Ring GNSS Antenna Test Report
Viewed 6715 times since Wed, Oct 2, 2013
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
The Effect of Antenna Covers On GPS Baseline Solutions (1997)
Viewed 6591 times since Wed, Mar 24, 2010
The Effect of Antenna Covers On GPS Baseline Solutions J. Braun, B. Stephens, O. Ruud and C. Meertens University NAVSTAR Consortium, Boulder, CO Abstract With the increasing number of permanent GPS monuments being deployed, many investigators are... Read More
Trimble Choke Ring Antenna Mean Phase Center Calibration (1996)
Viewed 5218 times since Fri, Oct 31, 2008
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
Preliminary Report on Data Quality with a Trimble 5700 GPS Receiver and an Ashtech Choke Ring Antenna (2002)
Viewed 4085 times since Wed, Dec 3, 2008
Preliminary report on data quality with a Trimble 5700 GPS receiver and an Ashtech Choke Ring Antenna Date: May 22, 2002 Author: Mike Jackson A critical issue with the use of the Trimble 5700 GPS receiver for use as a geodetic base station system is... Read More
UNAVCO testing of the SCIGN radome (2001)
Viewed 3749 times since Wed, Mar 24, 2010
SCIGN Dome Testing The purpose of this test was to see the affects on station coordinates when a SCIGN radome is placed on a choke ring antenna. This report presents results from a test that was conducted at the UNAVCO facility in Boulder... Read More
Assessing the Impact of the SCIGN Radome on Geodetic Parameter Estimates (paper, 2007)
Viewed 3505 times since Wed, Mar 24, 2010
Assessing the Impact of the SCIGN Radome on Geodetic Parameter Estimates John J. Braun UCAR/COSMIC Program P.O. Box 3000, Boulder, CO Introduction The SCIGN radome is widely used within the geodetic community to protect GPS antennas at... Read More
An Improved GPS Geodetic Antenna (1996)
Viewed 2606 times since Wed, Mar 24, 2010
An Improved GPS Geodetic Antenna F. Solheim, C. Alber, M. Exner, C. Rocken, C. Meertens, J. Johnson UNAVCO, POB 3000, Boulder, CO 80307 Signal reflected from the antenna environment mixes with the direct sky signal to induce error in GPS... Read More
The Role of Multipath in Antenna Height Tests at Table Mountain (paper, 1995)
Viewed 2493 times since Wed, Mar 24, 2010
The Role of Multipath in Antenna Height Tests at Table Mountain James Johnson, John Braun, Chris Rocken, Teresa VanHove UNAVCO July, 1995 Abstract In order to determine what effect the antenna height has on baseline horizontal and height... Read More
1995 UNAVCO Antenna Height Tests
Viewed 2391 times since Wed, Mar 24, 2010
At the 1995 UNAVCO Users Meeting (May 2 and 3), Working Group 3 (WG3) asked the facility to conduct tests to determine the effect of different antenna mounts on GPS baseline results. Especially the effect of mounting antennas low above the ground... Read More

Last modified: Monday, 12-May-2014 00:18:29 UTC