Had a chance to use a GPS/Glonass unit on the VRS , I compared it to my Hiper GPS only and accuracy in the verticals were poor compared to my Hiper I was seeing error in the .25' range never seen that with my hipers gps only on VRS. I did get more productivity out of it staying fixed but I worried the Glonass hurts the accuracy .
What type of control are you checking into? We always use GPS and Glonass and the vertical is almost always pretty tight?
I would check the accuracy of the network before I blamed GLONASS. There is a common (in my opinion) misconception that more satellites means better accuracy. I would tend to argue that it generally improves your ability to obtain and maintain a "fixed" solution under less than optimal conditions. In open sky I would expect similar accuracies with or without GLONASS.
Does the network that you are using provide a true VRS (modeled) solution? If not, you may be utilizing a single baseline solution which would impact your vertical accuracy based on spec'd parts per million as your distance from the traditional terrestrial CORS increases.
> Had a chance to use a GPS/Glonass unit on the VRS , I compared it to my Hiper GPS only and accuracy in the verticals were poor compared to my Hiper I was seeing error in the .25' range never seen that with my hipers gps only on VRS. I did get more productivity out of it staying fixed but I worried the Glonass hurts the accuracy .
Don't worry Lightsquared will soon alleviate your current concerns.
GPS Glonass Vrs.
Will dual frequency static be affected by light squared as well .
We were checking the GPS control with a total station and BS check was out vertically in terms of a couple tenths . My Hiper GPS usually is between .05' and a .10' , so I am surprised to see .20'... wondering whats going on .
GPS Glonass Vrs.
For some reason Schrock's post hit my funny bone LOL 😉
GPS Glonass Vrs.
Lightsquared will directly affect the L1 signal. All dual frequency receivers use L1 to initialize. Without L1 we will have to re-think and re-develop the way we currently do things.
This is purely my opinion and I am sure that the professional grade receiver manufacturers are taking all threats into account and regardless of the outcome will find away around any interference's.
To say that GPS/GNSS navigation will simply go away if the current lightsquared model is put into place seems ridiculous to me. The GNSS technology is used as a core part of our infrastructure these days. None of us can imagine living without it as far as I can see. Re-iterate that through your elected officials as I have done and it will not take a Congress of rocket scientist to realize that this is going to have a negative impact on not just us but 80% of the public. Nobody is throwing their Garmin (L1 only last time I checked) away. Are voices need to join the voices of the masses that for the most part do not even realize that this is going on.
Either way GNSS/GPS is not going away. This service has become much too valuable to the majority of the population. If lightsquared (not likely on their current frequencies) comes to fruition we will collectively find a way to mitigate their influence on what we are doing. I think we should vocalize our concerns but at the end of the day stop panicking. We will not be dragging transits and chains out of the closet.
Deep breaths..... 10, 9, 8, 7....
