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Maybe I'm biased living in a farming community, but is there anywhere that you are likely to find many cell phones available to provide correction data where yo

Maybe I'm biased living in a farming community, but is there anywhere that you are likely to find many cell phones available to provide correction data where you won't also find fixed base stations?

wyldfire 3y ago
Their goal is to improve the performance through multiple measurements. Maybe like a rake receiver / antenna diversity, they can compound the multiple measurements from GPS satellites to get improved location information.
- randomdata 3y ago
  A single fixed base station normally expects ~1cm accuracy on the roving receiver. There is nothing in the article to suggest that they are going for even greater accuracy or precision, merely that they want to avoid fixed base stations in favour of many roving stations. That'd have been great 20 years ago, but now that the base stations are already there, what have you gained? Maybe some limited utility in remote places that normally don't see human activity that somehow have many people with cell phones show up, while needing high accuracy GPS and forgetting their tripod-mount base station at home – but beyond that?
seagor 3y ago
I think the novel part of the team's work is mobile phones can't directly use base stations for error corrections. We don't want to use mobile phones to replace base stations for the traditional surveying use case but instead use GNSS measurements from multiple mobiles to improve their own positioning. The same way having multiple GNSS constellations improves the accuracy of your phone because you have more satellite to receive measurements from. If you multiply that again by having multiple phones getting measurements you have more data to solve for location with. One user's phone's may be obstructed while another had great clear views you can use those additional views to improve the positioning for the obstructed phone.
- randomdata 3y ago
  Is that the case? The article suggests that the correction data obtained from the phones is like the correction data obtained from a fixed station. Presumably multiple phones are needed to provide correction data only because those phones are also moving themselves, using many sources to also correct for that movement. The novel part seems to be that they think they can build a business selling correction data back to the customers who provided it to them, not having to rely on third-party fixed base stations or installing their own.
  - seagor 3y ago
    That is accurate - the error correction comes from aggregating measurements from multiple mobile devices instead of using a base station. The goal is to provide the service to mobile app developers who use location based services. They already have relationships with their users and our goals is simply to provide them a better performing location service.

Maybe I'm biased living in a farming community, but is there anywhere that you are likely to find many cell phones available to provide correction data where you won't also find fixed base stations?

wyldfire 3y ago

Their goal is to improve the performance through multiple measurements. Maybe like a rake receiver / antenna diversity, they can compound the multiple measurements from GPS satellites to get improved location information.

randomdata 3y ago
A single fixed base station normally expects ~1cm accuracy on the roving receiver. There is nothing in the article to suggest that they are going for even greater accuracy or precision, merely that they want to avoid fixed base stations in favour of many roving stations. That'd have been great 20 years ago, but now that the base stations are already there, what have you gained? Maybe some limited utility in remote places that normally don't see human activity that somehow have many people with cell phones show up, while needing high accuracy GPS and forgetting their tripod-mount base station at home – but beyond that?

seagor 3y ago

I think the novel part of the team's work is mobile phones can't directly use base stations for error corrections. We don't want to use mobile phones to replace base stations for the traditional surveying use case but instead use GNSS measurements from multiple mobiles to improve their own positioning. The same way having multiple GNSS constellations improves the accuracy of your phone because you have more satellite to receive measurements from. If you multiply that again by having multiple phones getting measurements you have more data to solve for location with. One user's phone's may be obstructed while another had great clear views you can use those additional views to improve the positioning for the obstructed phone.

randomdata 3y ago
Is that the case? The article suggests that the correction data obtained from the phones is like the correction data obtained from a fixed station. Presumably multiple phones are needed to provide correction data only because those phones are also moving themselves, using many sources to also correct for that movement. The novel part seems to be that they think they can build a business selling correction data back to the customers who provided it to them, not having to rely on third-party fixed base stations or installing their own.
- seagor 3y ago
  That is accurate - the error correction comes from aggregating measurements from multiple mobile devices instead of using a base station. The goal is to provide the service to mobile app developers who use location based services. They already have relationships with their users and our goals is simply to provide them a better performing location service.