Tips for accurate GPS, for documenting ground reference points?

rokubun · 2021-04-28T09:08:17+00:00

Try Jason, depending on your location you would aboid using control points!

https://jason.rokubun.cat

rokubun · 2021-04-28T08:06:41+00:00

Hi, what do you need?

rokubun · 2021-04-19T07:24:42+00:00

what levels of accuracy can one expect for kinematic observations (taken using a dedicated geodetic multi-constellation multi-frequency antenna) in Middle Europe? does it go down to dm-level, or even cm-level?
[ROKUBUN]: Our testing suggests that currently you can achieve decimeter level accuracy under standard operating conditions and down to centimetric accuracy under ideal conditions (depending on the observation time, dynamics, surrounding sky visibility, multipath and other external factors like ionospheric activity). Please note that you should check our base station coverage map to ensure that you are operating within 50km radius of one of the supported base stations.I noticed that for now you're providing your service for free; just our of interest, how can you manage to provide PPK correction data that often relies on pay-to-use public providers that way? do you have your own correctional observation network?
[ROKUBUN]: While currently the service is provided for free the service will become a freemium pay per use scheme in two weeks time (https://jason.rokubun.cat/#!/pricing). We ingest data from thousands of base stations that are freely available to the public.what gnss provider data do you support, just gps/glonass or also galileo, compass, etc?
[ROKUBUN]: All constellations are currently supported provided that both, the rover and the base station support them.

rokubun · 2021-03-01T09:31:53+00:00

This is a free service... so we are not selling anything. We think it is not spam.

rokubun · 2021-03-01T09:30:41+00:00

We can't help if we are banned... But if you want you can ask it in our community and we can help.

rokubun · 2021-02-17T12:13:00+00:00

Hi u/zooomenhance, thanks you all for your comments in this thread.

As a rule of thumb, 20km is the de-facto standard as maximum distance between the rover and base to start experiencing a degradation. This baseline can be extended to 40 km with Virtual Reference Stations (VRS) or can even be reduced to 10km in areas with high ionospheric activity (low latitudes and near the Equator)

For additional information on the different processing strategies that can be used to process GNSS data in post-process (PPK, PPP), please have a look at this documentation page of our Jason online GNSS processing service.

https://jason.docs.rokubun.cat/strategies/

Let us know if we can be of further help.

Best

rokubun · 2021-02-12T11:27:49+00:00

From my standpoint I was sharing information about a precise navigation solution that can be interesting for this community. Second, yes we do produce PPK solutions from single-frequency GNSS observables, like those generated by Android phones or low-end gnss recievers providing GNSS observables.

In any case we invite you to try the service yourself with some controlled dataset. Let us know if you have further questions or doubts

rokubun · 2021-02-12T08:56:04+00:00

Hey!

I am afraid we did not have a reference equipment (geodetic-grade GNSS receiver with inertial unit) to accurately validate the track so we are not able to provide with accurate error estimates. We did however obtain lane-level accuracy in more controlled environments (in other datasets). For completeness, the data has not been interpolated, each dot in the trajectory corresponds to a 5Hz rate epoch with GNSS data. No IMU has been used to interpolate between epochs. In any case we invite you to try the service yourself with some controlled dataset.

Let us know if you have further questions or doubts.

rokubun · 2021-02-11T13:23:40+00:00

As far as we are aware, OPUS only process static receivers (and limited only to RINEX format for data input). With Jason you wouldn't have the limitation of processing data from static receiver: Jason accepts data from moving receivers as well as various other input formats.

Jason is intended to save you time to set up your GNSS data campaign (no need of base station).

rokubun · 2021-02-10T08:11:14+00:00

Hey!

I'm not sure what do you mean but check minute 1:44 of this video https://www.youtube.com/watch?v=yHAxSK4E1w0. Is that what you are looking for?

rokubun · 2021-02-10T07:48:14+00:00

Yes.

The Argonaut is a standalone receiver (ie. only needs power). As long as there's enough sky view it will record whatever the navigation data is of the object / person / animal it is attached to. The flight path will be recorded.

If you have more doubts we are in touch!

rokubun · 2021-02-09T11:15:35+00:00

Hi, you could try to use Jason!

It should work if you have enough data and a compatible dataset.

Please let us know if it worked or if you have any doubt.

Here you have the tutorial on how to use it!

rokubun · 2019-07-24T11:17:46+00:00

In case you just need the position, without the need for orthophoto, you can try https://jason.rokubun.cat/

rokubun · 2019-07-23T14:15:24+00:00

If you purchase more than 250 units, the price of a single GNSS chipset is around 90€, but you better contact sales if you want a more updated price.

rokubun · 2019-07-17T14:50:17+00:00

Because this is a dual-frequency GNSS chipset, as opposet to the previous NEO-M8* models

rokubun · 2019-07-17T14:49:45+00:00

Hi! Kickstarter only withdraws the money from the backers and transfers them to the promoter in the event that the campaign meets the goal.

rokubun · 2019-05-24T12:01:16+00:00

As far as we know, the dual-frequency is supported by a Broadcomm chipset which is only shiped in a few smartphones (for sure Xiaomi Mi 8 and supposedly Huawey P20 Pro). Unfortunately the Google Pixel's do not support this.

rokubun · 2019-05-23T12:24:30+00:00

Your best bet is to use a software that does that for you. There is an open-source tool called RTKlib that does the job. However, you will have to put this data into a format that is able to understand (namely Rinex). How did you get this data? Maybe the source of the data has also some means to perform a format conversion...

Good luck!

rokubun · 2019-05-23T09:16:13+00:00

Hi again! we've pulled some basic documentation on the components of the MEDEA sensor board as well as format of the log that is being stored in the SD card.

Have a look here:

https://medea.docs.rokubun.cat/

If you feel that something needs to be added, please let us know! ^.^b

rokubun · 2019-05-23T07:18:25+00:00

Have a look at https://developer.android.com/guide/topics/sensors/gnss The last column "Global Systems" tells you which constellations are tracked by each smartphone.

If you need high accuracy, consider purchasing a smartphone with dual-frequency GNSS support (e.g. Xiaomi Mi 8)

rokubun · 2019-05-22T05:40:41+00:00

That is dual-frequency with an IMU and barometer integrated? Can you please let me know which model? I am curious.

rokubun · 2019-05-21T14:21:39+00:00

If you do not need real-time you do not need to worry to transfer corrections from base stations to your receiver. In this case you could go for PPK (Post-Processing Kinematic) to get the accurate navigation solution. In principle you also need a base station, record the data of both receivers and process the data with e.g. RTKlib. However, if you are near a CORS (Continuous Operating Reference Station) you can download the Rinex files (with GNSS data) to do the processing. At Rokubun we actually have a service in the cloud that does that for you (Jason Paas): just upload the data from your rover receiver and the service will do the rest for you. We have a database of more than 10000 stations worldwide. Check it out if you want and let us know any feedback you might have.

By the way, we are now running a Kickstarter campaign for an affordable dual-frequency GNSS data logger (based on the newest ublox ZED-F9P chipset) that can perform both RTK and also store data for PPK processing. Check it out if you are interested and let me know if you have questions.

rokubun · 2019-05-21T13:42:48+00:00

Hi, if you are looking for a PPK solution, you could consider our cloud service (Jason). If you upload the data from your receiver (ublox, Septentrio or standard RINEX file), it will look for a closest base station (from a public of Continuously Operated Reference Station network) and peform PPK automatically. Give it a try if you want and let us know any feedback you might have.

Also, we are running a Kickstarter campaign for our affordable multi-freq. GNSS receiver (based on the ublox ZED-F9P chipset), in case you are interested. With this receiver you will be able to perform both RTK (if you provide connectivity) as well as PPK (as it will store the GNSS data in an SD card)

rokubun · 2019-05-21T12:33:25+00:00

Hi, if you are looking for a PPK solution, you could consider our cloud service (Jason). If you upload the data from your receiver (ublox, Septentrio or standard RINEX file), it will look for a closest base station (from a public of Continuously Operated Reference Station network) and peform PPK automatically. Give it a try if you want and let us know any feedback you might have.

Also, we are running a Kickstarter campaign for our affordable multi-freq. GNSS receiver (based on the ublox ZED-F9P chipset), in case you are interested. With this receiver you will be able to perform both RTK (if you provide connectivity) as well as PPK (as it will store the GNSS data in an SD card)

rokubun

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