A salesman told me L5 will truly allow surveyors to survey under tree canopy. Anyone want to share their opinions on this.
Thanks
Adrien
No Problem, Just Wait 10+ Years For Enough Satellites
Paul in PA
Perhaps, once there is a constellation of L5 satellites. Until then, buying an L5 receiver won't do a lot of good. I'm sure that bothers your salesman no end.
Specifically, there are just 2 satellites broadcasting L5 right now and that's just not enough to make a difference. They are launching new ones at the rate of 1 or 2 a year, pretty much as needed to replace older ones that quit working. But the old ones are just lasting much longer than expected. So it is very possible that in 10 years we may have no more than a dozen or so L5 capable satellites, which still won't likely be enough to routinely GPS under canopy.
Further, only when we have those signals will we be able to get out there and find out if it actually will work as anticipated.
I have a little black box and it defys all laws of physics. Do you believe me? would you buy one? Would you like to buy the brand spanking new xray total station so that you can check your backsight on the other side of the block when the line of sight is blocked by buildings?
I've heard the counter argument: "Louder Multipath is still Multipath". But someone posted the other day that there could be as many as 90 GPS-like satellites in the distant future, with stronger signals. I guess we'll just have wait and see.
No. Your salesperson lied to you. L5 satellites will provide more of "chance" but even then you're looking a lower quality data.
it's supposed to get better, but who knows. a standard off the shelf is supposed to be sub-meter with L5.
i am avoiding a new GPS until lightsquared is resolved.
> A salesman told me L5 will truly allow surveyors to survey under tree canopy. Anyone want to share their opinions on this.
>
With a handheld recreational unit!
+/- 30'
Accurate L5 Ranging Is Dependant On The L1 Signal
L5 being farther away from L2 than L2 it gives a better ranging L1 to L5 than L1 to L2. The real strength is that the L1 to L2 differencing is still available. The L2 to L5 differencing will add very little to the solution, and most likely will be only used as a check.
If the L1 signal is bolloxed up the L2 to L5 differencing only, will be far worse than what we have today. You may just end up relying on an L5 only solution. It will satisfy most uses except for precise positioning.
Paul in PA
Wow!
In my opinion, L1, L2, L2C, L5, and Lxx are only broadcast data that can't reach any receiver if no line of sight is established between satellite and receiver. So it is false to claim that L5 can work under heavy foliage.
Supporting L5, Compass, Galileo and other nonoperational constellation is a waste of money at this point.
Just an opinion.
GPS - L5 Has Stronger Signal
So it will get to the antenna, but not always by a direct path.
Paul in PA
GPS - L5 Has Stronger Signal
Multipath becomes a problem in that case.