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improved precision with higher frequency?

Q&A forumCategory: Questionsimproved precision with higher frequency?
josegarcia asked 4 months ago
Hi. Is there any reason why using a higher navigation rate would result in better precision measurements when connected to NTRIP base which transmits at 1Hz? This is for static points where the antenna is at a fixed position for several seconds.
Staff replied 4 months ago

Hi Jose,

Not necessarily, usually at higher update rate, higher device dynamics are expected and the position output will be noisier.

replied 4 months ago

In my experience it is not necessary to send RTCM3 MSM messages at rates above 1 or 2 Hz, even if the Rover is outputting solutions at 8 or 10 Hz

Constant messages like 1005 and 1230 can be sent at lower rates, say 1/5 or 1/10 th Hz, as the receiver retains this information about the station. This helps reduce overall bandwidth, and gives that over to data which is useful.

Use as high a baud rate as possible. This reduces the latency. The Air Rate can be 19,200 baud, where as the link from the radio to the GNSS receiver can be 230,400 or 460,800 baud.

Sending the data at 2 Hz can provide additional opportunity if there is data/packet loss in the connection.The data link should not retry, as the data just becomes more stale, it is better to get newer/fresher data than attempt to fix the older/damaged data.
This would be why UDP is preferable over TCP/IP