If the raw 1PPS is outside of the filled in blue area, then that point is not used in the discipline control loop. The light blue filled in area is the standard deviation which is the basis of the second level filtering. The red line is the filtered version of the raw. The blue line is the unfiltered raw 1PPS. The figure below shows this filtering in action. The second level of filtering uses the standard deviation of the filtered value to weed out outliers or spikes from the raw. First NMEATime2 will filter the raw 1PPS using a digital filter and send that filtered result to discipline the PC clock. NMEATime will use either the GGA or ZDA sentence to derive a one second epoch which is referred as a one pulse per second (1PPS) signal, characterize the sentence, and try to filter out any spikes or outliers before sending the filtered signal to the control algorithm. Right-click on the service and choose the desired function. Click on the "Services" tab and look for the "NMEATimeService.exe". You should see the Task Manager application. First, click on the "Start" button, and type Task Manager, and press enter. To do this from Windows 10, start the task manager. The NMEATime2 service can be started, stopped, and restarted. You can tell that it is running by its status on the tray-bar. The NMEATimePanel will allow you to control and view the status of the NMEATimeService. The front-end user interface, NMEATimePanel, will run when either you start it from the start menu or the NMEATime tray-bar status icon. This service is responsible for disciplining the PC clock to the GPS reference and is the heart of the system. When the PC is booted, the NMEATimeService is started and will run indefinitely until the PC is turned off. The back-end service is called NMEATimeService. The back-end service, the front-end user interface, and the tray-bar status. NMEATime consists of three software programs. NMEATime runs on the PC as a service disciplining the PC clock to the GPS reference.
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