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their experiences with ProMark3 RTK !

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(@felino2)
Posts: 6
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good afternoon, I have thought about buying a pair of gps promark 3 rtk but I seriously doubt the information found on the Internet, I think it would me more useful the information from people who have actually used .., "truly" real form, which is the presicion in rtk manuals say ?, <1m, other submeter ..., what is your opinion?

buenas tardes, tengo pensado comprar un par de gps promark 3 rtk pero tengo serias dudas con la informacion encontrada en internet, creo que me seria de mas utilidad la informacion de personas que verdaderamente lo han usado.., "verdaderamente" en forma real, cual es la presicion en rtk?, los manuales dicen < 1m, otros submetrica..., cual es su opinion?

 
Posted : 04/04/2015 11:41 am
(@kent-mcmillan)
Posts: 11419
 

From reading the manual of the ProMark3 RTK, it appears that the main consideration will be how open the view of the sky is. If you plan to use it in a landscape without many trees or tall buildings, and with a good view of lots of sky, it probably is realistic to think that you could obtain results of about +/-(1cm + 1ppm) for 68% of positions if the distance from the base receiver to the rover receivers is less than 10km.

The caution is that the rover must be initialized to begin with, which will require leaving it in one position for about 10 minutes or more until initialization is gained. If initialization is lost, you will either need to return to a point whose position with respect to the base receiver is known or again wait about 10 minutes or more to regain initialization.

El manual del ProMark3 RTK, dice que la consideración principal será la vista del cielo. Si va a usarlo en un paisaje sin muchos árboles o edificios altos, y con una vista de casi todo el cielo, probablemente seria realista pensar que se podía obtener resultados de aproximadamente +/-(1 cm + 1 ppm) para el 68% de las posiciones si la distancia desde el ProMark3 base al ProMark3 móvile es menos de 10 km.

La advertencia es que el rover se debe inicializar para empezar, lo que requerirá dejándolo en una posición durante unos 10 minutos o más hasta que se ganó la inicialización. Si se pierde la inicialización, usted necesitará volver a un punto cuya posición con respecto al receptor base se conoce o también esperar unos 10 minutos o más para recuperar la inicialización.

 
Posted : 04/04/2015 2:09 pm
(@felino2)
Posts: 6
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but .., what is the presicion in rtk ??

 
Posted : 05/04/2015 11:04 am
(@kent-mcmillan)
Posts: 11419
 

If it is a fixed integer solution of good quality and the distance, D, to the base receiver is less than 10km, a standard error/standard deviation +/-[1cm + (D/10^6)] in N and E is probably realistically possible. You would want to repeat all important positions at different times to make certain that no great error existed in the position.

The problem in many landscapes would be keeping the rover tracking a sufficient number of satellites as it moves around the site. Passing under trees, for example will tend to interrupt that. If the rover stops tracking the necessary number, then it would not give fixed integer solutions until it had been reinitialized by logging either at least 10 minutes of observations on at least four satellites or had returned to a point the position of which was known in relation to the base receiver.

Si se trata de una solución FIXED INTEGER de buena calidad y la distancia , D, para el receptor base es de menos de 10 km, un error estándar / +/- desviación estándar [ 1cm + ( D / 10 ^ 6 )] en N y E es probablemente realista posible. Usted quiere repetir todas las posiciones importantes en diferentes momentos para asegurarse de que no existía un gran error en la posición .

El problema en muchos paisajes sería mantener el rover seguimiento de un número suficiente de satélites a medida que avanza por el sitio. Al pasar bajo los árboles , por ejemplo, tiende a interrumpir ese . Si el móvil se detiene el seguimiento del número necesario, entonces no sería dar soluciones FIXED INTEGER hasta que hubiera sido reinstaladas ingresando ya sea de al menos 10 minutos de observaciones sobre al menos cuatro satélites o había regresado a un punto de la posición de que era conocido en relación al receptor base.

 
Posted : 05/04/2015 11:33 am
(@felino2)
Posts: 6
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but .., what is the presicion in rtk ??

 
Posted : 05/04/2015 12:42 pm
(@oldpacer)
Posts: 656
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I still use my ProMarks 3's frequently, but rarely as single baseline rover/base anymore. I STILL find it easier to use a robot for locational collection and gps for major and minor control. That's not the convention, based on what I read or what I see other surveyor do, but I find that the quickest and best for me. Kent is spot on with every thing he said. They are plenty accurate enough, but take too long to set up, have too much external stuff, don't fix quickly or stay fixed without being very particular. There are too many other options out there if you need an RTK machine.

 
Posted : 05/04/2015 2:49 pm
(@kent-mcmillan)
Posts: 11419
 

> but .., what is the presicion in rtk ??

I understood that the RTK positions that the ProMark3 delivers can be of two types. These are FLOAT solutions and FIXED INTEGER solutions. The precision depends upon the type of RTK solution that is being obtained. FLOAT solutions are not high precision. FIXED INTEGER solutions should have a precision (RMS error) of +/- (1cm + D/10^6) if conditions at the rover are excellent.

Excellent conditions means, among other things, very little multipath and good satellite geometry.

Entendí que la RTK posiciones que el ProMark3 entrega puede ser de dos tipos . Estas son soluciones FLOAT y soluciones FIXED INTEGER. La precisión depende del tipo de solución RTK que se obtiene . Las soluciones FLOAT no son de alta precisión. Soluciones FIXED INTEGER deben tener una precisión ( error RMS ) de +/- ( 1 cm + D / 10 ^ 6 ) si las condiciones en el rover son excelentes.

"Excelentes condiciones" significa, entre otras cosas, muy poco multipath y buena geometría de los satélites .

 
Posted : 05/04/2015 5:30 pm