Development blog


2019-03-25 Improved stability of the ublox ZED-F9P sawtooth

The ublox ZED-F9P sawtooth amplitude is about 5 ns, three times smaller than the ublox NEO-M8T. This results in improved stability, and improved time-transfer, at short averaging times. In the plot, the sawtooth-corrected receiver PPS has been measured against a Microsemi 5071 (standard tube). The TDEV of the 5071, measured against another 5071 and then divided by sqrt(2), is shown for comparison.
ublox ZED-F9P sawtooth DEV

2018-09-05 GLONASS time-transfer results from the NVS NV08 GNSS receiver

We are investigating multi-GNSS time-transfer, initially using the NVS NV08 GNSS receiver's GLONASS capabilities. The plot below shows a common clock comparison, between a Septentrio and a NVS receiver, using RINEX observations averaged at each observation time. The receivers are operating off a common antenna. The steps in the data near day boundaries are related to the NVS receiver's estimate of the UTC-GPS difference, which is needed to calculate UTC-GLONASS.
NVS GLONASS time-transfer

2016-09-18 Laser cut panels received

The panels for the enclosure are back and we're doing a final test before sending the PCBs off for stuffing. Pictures soon.
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