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... Read More

**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

How to use declination to align the GNSS antenna to true north For consistency both within and between campaign GPS surveys, GPS antennas are generally aligned to true north (antenna elements may be asymmetrical). Most antennas have markings... Read More

Please contact Topcon directly for the latest GRIL documentation Read More

The attached file contains instructions on how to download GNSS data from the Topcon GB-1000. Read More

.pdf file is attached. Read More

Temperature Sensor With RS232 Serial Interface The purpose of this article is to present a method for creating a low-cost temperature sensor that can communicate over an RS232 serial connection with a Trimble GPS receiver. The temperature data can... Read More

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

TRIM4000 DOS-based Download Program for Trimble 4000 SSE and SSi Receivers UNAVCO 8/02 This is an outline of the steps needed to download data from Trimble 4000 SSE and SSi receivers. NOTE: The TRIM4000 program does not work properly when running DOS... Read More

This document shows how to swap a Trimble Zephyr GNSS Antenna for a Trimble Choke Ring GNSS Antenna. Read More