teseo-liv4f + cep

[mich35]

Hello,

Is there any specific parameters to configure to acheive correct CEP?

Starting from default mode I found a CEP worst than some L1 only GNSS....despite I respect the 70x70mm ground plan for the antenna....

Many points are correct (but not more) but a few are awfull (more than 20m far away from position...)

Do you suggest any ceramic antenna?

Best regards

Mich

[Francesco Virlinzi]

Hi

The module doesn't need any special configuration.

Do you have good CN0 satellite signals?

Which antenna are you using?

how are you testing? (open-sky... urban-canyon)?

Thansk

Regards

 Francesco

[mich35]

Hi,

Actually I use antenna reference ANT-GNCP-TH258L15 from Linx but any other gestion is wellcome.

The prototype is outside on the dashboard of my car.

The teseo is power down, only VBAT is present. The teseo is power on and the 3rd correct position is recorded.

Best regards

Mich

[mich35]

I can request the GSV messages, which values do you consider as good for the CN0?

[Tesla DeLorean]

Mid/Upper 30's into 40's or above

Below 32 dbHz for GPS means you can see signal but can't demodulate navigation data stream.

Put antenna on roof 

[mich35]

>> Mid/Upper 30's into 40's or above

What do you mean?

[Tesla DeLorean]

Mean CNO dBHz numbers from 35-45 typically across all usable satellites. 

As reported by $GxGSV per satellite.

Should be able to see a dozen or more usable satellites.

Wasn't that the question?

Four or five satellites in the 20's and low 30's probably going to perform awfully..

[mich35]

seen satellite numbers are between 6 and 10 so no demodulation issue isn't it?

[Francesco Virlinzi]

in triple constellation and dual bands you should see much more satellites.

Could you check the firmware version you are using ($PSTMGETSWVER,255)

In case version <= 4.6.3.5.2 than please update to 4.6.3.5.3 available on st.com https://www.st.com/en/embedded-software/teseo-liv4fsw.html using the teseo-suite

[Tesla DeLorean]

Show the NMEA GSV sentences you're seeing.

You talking about CNO or satellite counts now?

GSV report four fields per satellite, unpack the sentences