This data is the result of monitoring four GPS/GPSDOs for about 42 days
in two batches.

UPDATE -- new data files added covering the CME events of 01 December
2023.

This directory contains three files from the orginal test:
2023_gps_geotest_original_files.zip
    -- original phase data recorded from TinyPFA analyzers
2023_geotest_timelab.zip 
    -- phase data imported to TimeLab and saved in TimeLab format
       (note that there are two files for the Bodnar receiver; one
       has the slight frequency offst removed -- see README.txt
       for more details)
2023_geotest_rinex.zip
    -- For comparison purposes, RINEX data recorded from a dual-
       frequency Mosaic-T GNSS receiver using the same antenna
       and 10 MHz reference source as used for the phase measurements.

Within the "original files" directory, the "0556" files begin at 
2023-09-05T20:35:57 (MJD 60192.85830; DOY 248), plus or minus a few 
seconds, and end about 1,819,472 seconds (21.058 days) later, at 
about 2023-06-26T22:00:29 (MJD 60213.917; DOY 269), capturing 
about 18,194,734 rows (tau = 0.1 seconds).

The "0060" files begin at 2023-09-26T22:01:01 (MJD 60213.91738;
DOY 269), plus or minus a few seconds, and end about 1,809,713
seconds (20.946 days) later, at about 2023-10-17T20:42:54
(MJD 60234.863; DOY 290), capturing about 18,097,136 rows
(tau = 0.1 seconds).

There is a gap of less than 60 seconds between the end of the "0060"
files and the beginning of the "0556" files.

The total capture period covered from September 5 through October
17, 2023, about 42 days. 

Data was collected using "TinyPFA" firmware on NanoVNA H4 devices
logging to USB.  The reference source was a passive hydrogen maser.

"ACM0", "chA" in the TimeLab files, is a Bodnar Mini GPSDO
"ACM1", "chC" in the TimeLab files, is a BG7TBL GPSDO
"ACM2", "chB" in the TimeLab files, is a u-blox NEO-M8T 10 MHz timepulse
"ACM3", "chD" in the Timelab files, is a Trimble Thunderbolt

In addition, the file "cme_01Dec2023.zip" contains three files
in Timelab format showing both a Bodnar MiniGPSDO and a prototype "GERT"
reference board measured at 100 samples per second for 48 hours beginning
2023-12-01T02:25:41 (MJD 60279.1012442).  Measurements were made with a
PhaseStation 53100A in single-reference/dual-DUT mode with the passive
hydrogen maser as reference.  Samples of both channels were taken
simultaneously.  The zip file includes both the raw Bodnar data, as well
as that data with the ~-1.6e-11 frequency offset removed.