International Earth Rotation and Reference Systems Service (IERS)
announced there will be an extra second added to the end of this year, so clocks will read 23:59:60 on December 31, 2016. Such leap seconds are occasionally needed to ensure Coordinated Universal Time (UTC), the official measure of time, stays in sync with changes in the Earth’s rotation. Additional details can be found here.
This issue affects only GLONASS-enabled receivers. GLONASS tracking will be temporarily interrupted on receivers operating during the introduction of the leap second on December 31st, 2016. GPS tracking will not be impacted, and receivers will continue to compute a position using the GPS constellation. OEM6 receivers may report a solution integrity warning during this period. GLONASS tracking will return to normal once a new GPS almanac is automatically downloaded from the satellites by the receiver. Receivers powered-up after the introduction of the leap second that do not have a current almanac will also temporarily have difficulty tracking GLONASS satellites. An almanac will not be available on start-up if the receiver has not been used in 90 days or if the almanac has been cleared manually by the user. GPS tracking will not be impacted, and receivers will continue to compute a position using the GPS constellation. OEM6 receivers may report a solution integrity warning during this period. GLONASS tracking will return to normal once a new GPS almanac is automatically downloaded from the satellites by the receiver.
Earth is entering a stream of high-speed solar wind, and this is causing G1-class geomagnetic storms on February 16th. This is not the CME we have been waiting for since Valentine’s Day. Instead, the solar wind is flowing from a coronal hole on the sun. Visit www.spaceweather.com for photos and more information.
This generally means GPS RTK will not fix as quickly or render as high precision. Spend more time on each point to improve precision.
We would like to bring to your attention important information related to the introduction of a leap second by the IERS
(International Earth Rotation and Reference Systems Service) on June 30, 2015. The introduction of a new leap second has been announced to be introducedfor June 30th, 2015 at 23:59:59. This will increase the difference between UTC and GPS time by 1 second to new 17 seconds.
All care is being given to assure that SmartNet North America GNSS infrastructure is not adversely affected by this introduction, but similar care should be taken by all SmartNet North America users on their GNSS rovers as well. Continue reading Leap Second Introduction June 30, 2015→