Force bad initialization on GPS

#1 · July 14, 2010, 5:21 am

I am lucky to have some nice novatel Sokkia RTK but had a bad initialization my guess anyways in large willow trees. I suspect that and i also know that i was pushing the equipment to a large limit

The limits means that even the Geo Robot would have a small battle getting the shot
through the green jungle.

This green patch is in the dry desert about 70 m = 200 ft about maybe 5 tough shots
how could one do this small stretch with out using the robot for 5 shots ?
repeat shots to same points after forcing a reinit on gps just to confirm ? first points by simple stake out of first shots.

Also how does one force a bad initialization just to see if it can be done repeatable
to some degree and thus learn the limits of the equipment.

Thanks to all

Peter K

#2 · July 14, 2010, 5:23 am

Oops

Here Is the equipment

Carlson SurCe Ver 2.41.1
New Allegro CX Ver 1.07a PIC 1.01 Logic 12

Geo 650 robot # 79 Firmware 696-03.08
Geo Radios @ 458.525 Mhz Ch 1

Sokkia Gsr1700Csx RTK L1 Two rovers, One base
post process soft Spectrum Ver 4.21 L1 dongle
Satel 3AS 1 watt, Stubby, 15cm, 30 cm GainFlex

Computer Hp Pavilion Core2 Quad
Vista 64
Nvidia Geforce 9500 GS 512mb Video Card
Autodesk C3D 2009 subscription stay here

#3 · July 14, 2010, 5:32 am

> This green patch is in the dry desert about 70 m = 200 ft about maybe 5 tough shots
> how could one do this small stretch with out using the robot for 5 shots ?

> Also how does one force a bad initialization just to see if it can be done repeatable
> to some degree and thus learn the limits of the equipment.

Well, second question first. To force a bad initialization, why not find a green patch in the dry desert, one full of willows? That would be where I'd put my money.

As to the first, the problem that I'd think you'd run into is that reinitializations within a few minutes of each other on the same point are apt to be subject to the same multipath conditions that may have botched your first initialization. So you pretty much need to return more than 20 minutes later when the SV constellation will have changed enough to give significantly different geometry and multipath effects at the station.

Alternately, you could just do it first class. Set some points in the clear via GPS, get your chain saw or loppers out, and set the robot to work.