Position stream timing

[charlie.huizenga]

I am using two M2 units streaming position (USB-PC) to a processor using NMEA format. I have the stream set to 1 Hz. The data from the M2 comes exactly every second, but not necessarily on the second boundary. For example, sometimes a stream will be at hh:mm:ss.000000 and other times (after stopping and restarting) it will be hh:mm:ss.600000 or hh:mm:ss.200000

It appears to always align to a multiple of 200 msec.

I want both units to align to the same time since i am doing some relative math on position of the two units.

Is there a way to control the alignment of the position stream? Preferably to be on the second boundary, but not a strict requirement.

[svetlana.nikolenko]

Hi Charlie,

It depends on the epoch of GNSS observables that was the first one, and there is no way to control it from ReachView.

Usually, to synchronize the time, a PPS signal is used. Reach devices can output them. Of course, it requires additional research and implementation, but it looks like the most straightforward and correct way to me.