Knowledge Base

AFREF Newsletter - Jan 2008

Fri, Feb 1, 2008 AFREF afref africa unoosa uneca permanent gps nasa gnn 0 1196 0/5 (0 Vote)

See attached .pdf file. Read More

AFREF Technical Workshop 2006 - Program

Fri, Feb 1, 2008 afref africa unoosa uneca permanent gps gnn 2006 cape town experts meeting workshop nasa gnn 0 1000 0/5 (0 Vote)

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Permanent GNSS/GPS Station Planning: Technology, Equipment, Costs

Thu, Jan 24, 2008 gps permanent station technology overview 3 10332 4.33/5 (3 Votes)

Permanent GNSS/GPS Station Planning: Technology, Equipment, Costs Permanent GNSS Stations for Geodetic Applications: Equipment, Sites, Costs -- S. Fisher This is intended as a primer for investigators wishing to implement permanent GNSS stations wit... Read More

Permanent GPS Station Installation Report form v.2 1997 (historical)

Tue, Jan 29, 2008 permanent station installation report 0 2786 0/5 (0 Vote)

**FOR HISTORIC PURPOSES ONLY** The attached .pdf file contains the UNAVCO Continuous Station Installation Report form, Dec. 1997. You may access a basic information form online that queries information required for submission to the UNAVCO... Read More

The Effects of L2C Signal Tracking on High-Precision Carrier Phase GPS Postioning

Tue, Jan 18, 2011 L2C L2P(Y) Carrier Phase signal tracking gps positioning 2 4053 3/5 (1 Vote)

The Effects of L2C Signal Tracking on High-Precision Carrier Phase GPS Postioning Introduction In December, 2005, the L2C signal was introduced to improve the accuracy, tracking and redundancy of the GPS system for civilian users. The unencrypted L2C... Read More

GPS Data Collection Methods

Tue, Jan 29, 2008 GPS basic information data collection methods 9 34113 3.44/5 (18 Votes)

GPS Data Collection Methods Various methods are used to collect high precision differential GPS data. The particular method used depends on several factors, including survey objectives, desired precision, available equipment, and field logistics.... Read More

Custom Cavity-Type Notch Filter for Mitigating GPS/GNSS Interference from Iridium Data Transmitters

Mon, Oct 24, 2011 Iridium Notch Filter Reactel GPS GNSS Transmitter Interference Slips 1 6355 0/5 (0 Vote)

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

Thu, Oct 28, 2010 Iridium GNSS GPS interference 2 6603 3/5 (2 Votes)

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

Trimble GPSurvey V2.35 - How to process GPS data (outline) (historical)

Tue, Jan 29, 2008 gpsurvey gps data post processing 0 4492 3/5 (1 Vote)

GPSurvey V2.35 - How to process GPS data (outline) UNAVCO 10/9/00 PROJECT: Create New or Open existing project LOAD data From DAT File: - CONFIG "interactive" or "quick edit/batch prompt" PROCESS Baselines – ADD files to process In WAVE... Read More

NASA/GGN - Current Station Status Map (Updated regularly)

Wed, Jan 23, 2008 permanent gps nasa gnn 0 1567 0/5 (0 Vote)

The file linked below contains a current map of the NASA GGN network stations. The status of each station is based on the most recent monitoring data available. http://www.unavco.org/instrumentation/networks/nasa-ggn/soh-map/index.php Read More

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