My application (topography for gravity flow drinking water systems in Nicaragua) requires a differential vertical accuracy of ~10cm. Based on my testing as well as what I read here, it looks like a FIX solution is required to achieve this. Also, the nearest NTRIP station is over 150km away, so I think I will be limited to using my own base with LORA. I am trying to better understand when the rover is able to get a FIX and have the following questions:
- The Correction Input data for the rover lists the number of satellites in view. Is this the total number of satellites in the data stream or is it the number of common satellites between the rover and base? I typically see a number like 10-15 here, when the individual receivers are seeing 25-30 satellites.
- Is there any reason not to use all available satellite types in the base or rover?
- Does it help to use more selective elevation or SNR masks in the base (or rover)?
- In cases where I can’t get a LORA signal from the base, I can use PPK. However, there is really no way to know while surveying if it’s possible to get a FIX result. How do people manage this?
Any other insight to improving the chance of getting a FIX solution (apart from the obvious strategy to place the base in an optimal location) would be appreciated!