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KNOT GPS/GNSS Details

Wed Oct 27, 2021 1:13 am

I am looking for details on the KNOT GNSS hardware. I have a KNOT here and side by side with a uBlox ZED-F9P dev board and it's not very sensitive. I'm not complaining, after all the uBlox module costs more than the KNOT lock stock and barrel but it makes me wonder... (I've filled some of these in as I've read the datasheet)

What is the GNSS/GPS module in the KNOT?
Quectel BG77 is an ultra-compact LPWA module supporting LTE Cat M1, LTE Cat NB2 and integrated GNSS
https://datasheet.octopart.com/BG77-Que ... 004296.pdf

Which GNSS networks does it support?
GPS/GLONASS/BeiDou/Galileo/QZSS

Antenna Impedance?
50 Ohms, typical for GPS

Max simultaneous satellites?

BG77 has GNSS UART pins (1.8V, Rx Pin 4, Tx Pin 36), are they exposed on the KNOT's PCB?

The BG77 datasheet suggests external LDO power, presumably KNOT supports active antennas, if so what voltage? Max current or watts?

Can estimated accuracy be added to the GPS monitor? Right now only HDOP is exposed

What is the best accuracy in ideal circumstances?

Would you consider to support RTK correction/NTRIP Server/Caster/Client (in a more expensive unit or add in module?)
 
marekm
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Posts: 379
Joined: Tue Feb 01, 2011 11:27 pm

Re: KNOT GPS/GNSS Details

Thu Oct 28, 2021 7:03 pm

No 1PPS timepulse available from the GPS module? At least I couldn't see it mentioned anywhere in that PDF.

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