Columbus P-7 Pro L5 Band Results?

[Tyler Kiehle]

I wanted to see if anyone else in the group has been fooling around with the Columbus P-7 Pro?  I've been testing it, but I'm only seeing L1 signals and not any L5 with GPTest.  I know for sure that some of the GPS satellites providing the L1 also broadcast the L5 band, GPS 10 for instance.  So I don't know what gives.  Anybody else experiencing this?

FYI, I've used the Gnsstoolkit3 software that is available from Columbus and it shows I'm receiving the L5 band, but I don't know if it's a tool developed by Columbus or a third-party.  So I question if it's biased.

Also, the Columbus P-7 Pro says it can utilize SBAS too, but the results I'm seeing don't suggest that level of accuracy I'd expect from SBAS at a known location in the open.

Tyler

[Sean Barbeau]

Tyler,

The status data you're seeing in GPSTest is likely from the internal chipset and not the P-7 Pro. To my knowledge there are ways to pipe lat/lon/although data into GPSTest but not status data. But if you don't have a special app set up to parse the P-7 Pro data and turn it into a mock location provider you wouldn't see this either.

Sean

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[Tyler Kiehle]

Thanks for the response.  I should have mentioned in my original email that I was using a mock location app, Bluetooth GNSS.  But I was wondering if maybe it didn't quite work as expected, because when I submitted my receiver to the Google Doc, the internal chip was listed instead of Mock ...  FYI, Google Maps does seem to use the P-7 output, there's a distinct difference between when I have the mock engaged and when it's not.  There have been some performance glitches when using the mock versus directly connecting via Bluetooth in Esri Field Maps app.  So any suggestions for a better performing mock app for Android would be appreciated.

Once I can run some tests on a monument I'll post my results.   So far the P-7 Pro seems to produce a pretty tight grouping of points, but using the GPSTest Accuracy tool, but the offset is significant 2-6m.  So, this receiver seems pretty precise but not as accurate as I had hoped.

Thanks again for the response.

Tyler

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[lodrog...@gmail.com]

hi,

i have read that you are using the Bluetooth GNSS as the main app to connect P7 pro with the smartphone device. Yes, this is the right app, as the company of product suggest into their web pages. I believe this action must the right one to support at 100% the P7 pro specs. Unless the company tries to fool their customers about p7 rpo specs or something has gone bad with your setup

anyway, i have found 2 more apps that may be used for the same reason, try them

GPS Connector

- https://play.google.com/store/apps/details?id=de.pilablu.gpsconnector&hl=en&pli=1

Drogger GPS for DG-PRO1(RW)

- https://play.google.com/store/apps/details?id=jp.bizstation.drgps&hl=en&gl=US

[Tyler Kiehle]

Update:  I followed the manufacturer's recommended procedure to test the gnss receiver's accuracy.

Using the GNSSToolkit3 software available on the Columbus website and following their directions, the results were less than stellar.  Certainly not the 0.5m CEP(50%) and 1.5m CEP(95%) they claim.  On their support site, they have directions to turn on SBAS calculations for the P-7 Pro, but it clearly did not use the visible WAAS satellite in the position calculation.  I even waited for over and hour to collect 3600 readings to allow for time to convergence, but it clearly didn't result in the advertised horizontal accuracy.  Besides, I thought one of the advantages of duel-band is that it doesn't require an hour for time to convergence.

Let me know if you notice some obvious mistake I've made that impacted the results you see in the attached screenshot.

Thanks,

Tyler

[Baard covington]

Cannot seem to get Bluetooth GNSS or Bluetooth GPS apps on android to feed data into GPS Test. Does anyone have a work around for this? 

EDIT: I have now used the GNSS Toolkit 3 on a Windows PC and it clearly shows GPS L5 and Galileo E5a signals alongside L1 and E1. My concern is this. 

If GPS L5 signals cannot be relied upon, is this possibly degrading the L1 derived position and speed accuracy?

Despite the P7-Pro being set to update at 5hz - confirmed by clock data, the speed data seems to refresh only at 1hz. And furthermore the speed data is very laggy compared to other devices. When accelerating in a vehicle, the indicated or calculated speed is way behind even my smartphone readout. Anyone know why this is? 

It's a very disappointing find. A 5hz receiver should update speed info faster than a 1hz smartphone - surely. Anyone know why this is so laggy?

I've tried various apps and the speed data is just as laggy on all of them. So that leads me to believe the issue is with the P7 Pro. HAs anyone else experienced this?

[gpsfan]

How are you getting along with the Columbus ? Have firmware updates maybe increased its accuracy ?

[Louis Philippe]

I had a demo ….and was giving readings grossly inaccurate….

On Dec 21, 2023, at 3:49 PM, gpsfan <web...@gmail.com> wrote:

Columbus

[Ruby Lisa Rockwell]

I am about to try the P-7 and P-10 with ESRI Apps (Field maps and Survey123). It sounds like you were getting better results through these apps than the testing app. How did your work with the P-7 go?

Kind regards, Lisa

[Stewart Holt]

I have been using a Bluetooth connected GPS for about 9 years. The best results will be from an application which directly connects to the Bluetooth GPS. I use Ultra GPS Logger on an Android phone. UGL can produce output in a number of formats including NMEA, KML, GPX, and CSV. UGL can also display useful accuracy data in real time while it is logging. It can also be a mock provider so that other applications can get the location information (but not the detailed accuracy parameters).

I have also used the Bluetooth GPS with ESRI applications Survey123 and Field Maps which support direct connection to the GPS.

Stewart