PPK of base position

[adussa]

A related query from a newbie working with GNSS data from Patagonia (thanks in advance!):

If we did several daily surveys using same base location but each time using Average Fix Position of 30min, I understand that all rover acquired points will be relative to a different Base position - how to make all the survey data consistent to a unique Base position?

My first thought is to use the base raw data longest log to get absolute Base pos (using CSRS since nearest IGS station 10 km away hasn´t got the data since 2020, and the next one is 385km away). Then use RTKPost with that Position for the Base for each survey day.

thanks in advance

Alejandro

[wizprod (Christian Grüner)]

@adussa

If we did several daily surveys using same base location but each time using Average Fix Position of 30min, I understand that all rover acquired points will be relative to a different Base position - how to make all the survey data consistent to a unique Base position?

By using the same base station at time of collection (RTK) or afterwards (PPK)

@adussa

My first thought is to use the base raw data longest log to get absolute Base pos (using CSRS since nearest IGS station 10 km away hasn´t got the data since 2020, and the next one is 385km away). Then use RTKPost with that Position for the Base for each survey day.

If you have the raw-files, you could PPP (not the same as PPK) the data with i.e. NRCAN.

[adussa]

Thanks @wizprod, I processed the base position with the best and longest day of acquisition data with NRCAN CSRS PPP, so now I can use that, let´s name it “LLHbasePPP”.
I assume is as easy as shifting all points LLHs by correcting dLat, dLong and dH from each day´s LLHbase(dayN) deviation from LLHbasePPP - right?
best
A

[polina.buriak]

Hi @adussa,

@adussa

I assume is as easy as shifting all points LLHs by correcting dLat, dLong and dH from each day´s LLHbase(dayN) deviation from LLHbasePPP - right?

This sounds correct!