GPS Sample Data

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Swift dual frequency road data

Comparison of simultaneous u-blox M8T and Swift Piksi Multi data from rover mounted on a car.  The u-blox receiver was using a Tallysman 1421 antenna and the Swift receiver was using a Tallysman 3872 antenna.  Details of the driving route were very similar to the Tersus/M8T data sets described below.

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Tersus BX306 dual frequency road data

This data set was taken simultaneously with the previous u-blox M8T data set using a Tersus BX306 receiver with Tallysman 3872 antenna on the rover and a CORS reference station 17 km away for base data.   Included are both the Tersus real-time solution and the post-processed RTKLIB solution along with base station data from a closer CORS station.   Both the Tersus real-time solution and the RTKLIB post-processed solutions were able to get 100% fix in the earlier part of the data taken in a parking lot with open sky views but both solutions had difficulty with the residential streets with moderate tree coverage.

This data is described in more detail in this post

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U-blox M8T road data with Galileo

Another data set from a pair of u-blox M8T receivers with the rover mounted on a car.  This time, the Galileo satellites are included and the rover antenna was upgraded to a Tallysman 1421.  With the extra satellites and the better antenna, RTKLIB was able to get a near 100% fix using continuous ambiguity resolution.  In an earlier similar data set without the better antenna or extra satellites, "Fix-and-Hold" was required to get the same level of fix.  The first part of the data was taken in the parking lot in the upper right corner of the image below and represents a fairly unobstructed sky-view.  The second half of the data set is taken while driving on residential streets with a moderate amount of tree canopy and represents a more difficult challenge for the solution.

This data is described in more detail in this post

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Drone flight 4/14/17

Several short drone flights with a pair of CSG M8T receivers.  The data included Galileo measurements as well as GPS, GLONASS, and SBAS and has over twenty satellites available for ambiguity resolution.  The short section of float that occurs at the end of each flight is caused by the drone bouncing on its side or back upon landing and blocking the antenna.  The position data plotted below is for the z axis only and was done with fix-and-hold enabled although most of the data is of high enough quality to use continuous ambiguity resolution

 

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Lake sailing 10/30/16

Two Laser sailboats each with an M8N receiver mounted on the deck in front of the mast.  One receiver ran at 5 Hz and used a u-blox antenna.  The other receiver ran at 1 Hz and used the inexpensive patch antenna that came with the receiver.  The base station for both solutions was a CORS reference site 18 km away.  Both solutions have close to 100% fix rate.  The boats heeling did not seem to affect the solution.

union_1030

 

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3DR radio test 9/6/16

Test of real-time processing using two 3DR radios for data link.  Base and receiver are both M8N receivers with u-blox antennas.  The base station is mounted on a tripod and the rover on top of a car.  The distance between car and base occasionally exceeded the radio range which can be seen as spikes in the "age of differential"  plot.

This data includes tag files and can be used as inputs for RTKNAVI for a simulation of a real-time run.

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Niwot car 7/28/16

Separate M8N and M8T rovers mounted on top of car driving through a residential neighborhood.  Separate M8N and M8T base stations. M8N receivers using u-blox antennas, M8T units are both Emlid Reach. Both M8N and M8T pairs have nearly 100% fix.

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Union Reservoir car 7/05/16

This data includes an M8N receiver and Emlid Reach M8T receiver mounted on top of a car and a fixed Emlid Reach base station. This is good data for playing around with moving-base solutions since it includes two moving receivers and a fixed receiver to help verify the moving-base solution. However,it does have a receiver warm-up glitch with a simultaneous cycle-slip on all satellites at the beginning of the moving M8T receiver which can make it a little more challenging to work with. I've also included the moving base configuration file I described in one of my posts.

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Kayaking 4/13/2016

Two Emlid Reach M8T receivers, one mounted at each end of a kayak running a 5 Hz sample rate while kayaking in the ocean near Sussex England.  Clean data set good for moving baseline testing.  Thanks to Matt for this data.