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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
GNSS Receiver Evaluations 2012
Viewed 6091 times since Wed, Jul 11, 2012
This article provides a summary of UNAVCO's comparison of the current state-of-the art hardware from 5 major manufacturers. It will include comparisons of receiver data quality in the following areas: double difference phase residual RMS;... Read More
Power Draw Profile for Trimble NetRS and Iridium Systems
Viewed 5749 times since Sat, Aug 28, 2010
Power Draw Profile for Trimble NetRS and Iridium System Test Summary UNAVCO performed a benchtop test to record a high-resolution time history of power consumed by a Trimble NetRS GPS system with Iridium communications. The test system consisted of... Read More
Trimble NetRS - Power Draw Tests
Viewed 4569 times since Sun, Mar 28, 2010
Trimble NetRS - Power Draw Tests UNAVCO performed a short benchtop test series to determine the difference in power draw by a Trimble NetRS receiver when connected to three common geodetic GPS antennas. All tests were performed at room temperature.... Read More
UNAVCO 2004 EarthScope Campaign Receiver Test Report
Viewed 4190 times since Wed, Feb 18, 2009
Click here to view the report, "UNAVCO 2004 GPS Campaign System Testing in Support of the Plate Boundary Observatory (PBO)," described below. UNAVCO issued Request for Proposal (RFP) in 2004 to purchase 100 high precision campaign GPS systems for use... Read More
GPS Receiver and Antenna Testing Report for SuomiNet (2000)
Viewed 4139 times since Wed, Mar 24, 2010
GPS Receiver and Antenna Testing Report for SuomiNet Mike Jackson, Chuck Meertens, Victoria Andreatta, Teresa Van Hove University NAVSTAR Consortium, Boulder, Colorado 1.0 Introduction SuomiNet is a university-based, real-time, national Global... 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
Digitizing Resolution of the Trimble NetR9 Receiver
Viewed 4021 times since Thu, Feb 3, 2011
Digitizing Resolution of the Trimble NetR9 Reciever While differencing the L2 and L2C carrier phase measurements made with a NetR9 receiver, we have observed a banding pattern; the difference between each band is ~0.0009765625 (1/1024) cycles. This... Read More
Digitizing Resolution of the Leica GR10 Receiver
Viewed 3266 times since Thu, Feb 3, 2011
  While differencing the L2 and L2C carrier phase measurements made with a Lecia GR10 receiver, we have observed a banding pattern; the difference between each band is ~0.002047434 cycles. Using the L2 wavelength we found that 0.002047434 cycles = 0... Read More
Topcon GB-1000 First Article Receiver Testing
Viewed 3241 times since Thu, Oct 30, 2008
Topcon GB-1000 First Article Receiver Testing September 29, 2004 Victoria Andreatta This document summarizes the changes requested by UNAVCO before the GB-1000 could be deemed fully acceptable as a campaign GPS system (acceptance of first article... Read More
UNAVCO GNSS Receiver Preferred Vendor RFP Evaluation Report
Viewed 3190 times since Thu, Oct 1, 2015
  Public Version: September 22, 2105 Originally submitted in confidence: May 18, 2015 Prepared by the RFP Evaluation Committee: Dr. Frederick Blume – Project Manager, Development & Testing, GI Directorate (Chair) Henry Berglund ­... Read More
UNAVCO 2003 GPS Receiver and Antenna Testing in Support of the Plate Boundary Observatory (PBO)
Viewed 3140 times since Thu, Jul 16, 2009
UNAVCO 2003 GPS Receiver and Antenna Testing in Support of the Plate Boundary Observatory (PBO) The attached file contains the 2003 PBO Permanent Station Receiver Test Report. The UNAVCO Facility in Boulder was tasked with evaluating various GPS... Read More
AOA Receivers Benchmark Test (1998)
Viewed 3078 times since Thu, Sep 10, 2009
AOA Benchmark Summer 1998 saw the introduction of the next generation of AOA GPS receivers. In its ongoing role to evaluate new GPS products, UNAVCO obtained an AOA Benchmark receiver from JPL and began evaluating its performance as compared to... Read More
Digitizing Resolution of the Septentrio PolaRx3e Receiver
Viewed 2209 times since Tue, Mar 8, 2011
While differencing the L2-Y and L2C carrier phase measurements made with a Septentrio PolaRx3e receiver, we have not been able to resolve a banding pattern in the differences or estimate the digitizing resolution of the PolaRx3e. This analysis was... Read More
Digitizing Resolution of the Trimble NetRS Receiver
Viewed 2128 times since Fri, Feb 4, 2011
While differencing the L2 and L2C carrier phase measurements made with a NetRS receiver, we have observed a banding pattern; the difference between each band is ~0.0039 (1/256) cycles. This banding demonstrates that the digitizing resolution of the... Read More
Trimble NetRS - tracking behavior changes after firmware upgrade
Viewed 2010 times since Thu, Mar 10, 2011
Using the quality check function in Teqc, we analyzed RINEX observation files from two GPS sites in the PBO network over a period of ~2 years. Both the sites in this analysis were equipped with Trimble NetRS receivers. We observed changes in the trac... Read More
Digitizing Resolution of the Trimble NetR8 Receiver
Viewed 1771 times since Thu, Jan 27, 2011
Digitizing resolution of the Trimble NetR8 receiver While differencing the L2 and L2C carrier phase measurements made with a NetR8 receiver, we have observed a banding pattern; the difference between each band is ~0.0009765625 (1/1024) cycles. This... Read More
Digitizing Resolution of the Topcon NET-G3A Receiver
Viewed 1718 times since Thu, Feb 3, 2011
While differencing the L2 and L2C carrier phase measurements made with a Topcon NET-G3A receiver, we have observed a banding pattern; the difference between each band is ~0.002047434 cycles. Multiplying 0.002047434 cycles with the L2 wavelength we... Read More
Digitizing Resolution of the Javad Sigma Receiver
Viewed 1423 times since Tue, Feb 15, 2011
While differencing the L2 and L2C carrier phase measurements made with a Javad Sigma receiver, we have observed a banding pattern; the difference between each band is ~0.001116499 cycles. Multiplying the phase by the L2 wavelength we found that 0... Read More

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