[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RTK Base and its accuracy
From: |
Florian Kiera |
Subject: |
RTK Base and its accuracy |
Date: |
Tue, 9 Aug 2022 17:06:28 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 |
Hello,
we recently started building an own RTK base for test purposes and seem
to have some issues with it. We want to test a simple RTK base-RTK rover
scenario.
About the setup: As hardware we use a raspberry pi 3b+ that is connected
to a ublox-M8P via USB. The antenna and the other components are all
installed ontop of the building. The raspberry has the latest version of
Raspberry Pi OS (Bullseye). I installed the latest gpsd version
(3.24.1), RTKLIB (https://github.com/tomojitakasu/RTKLIB.git) and
ntripcaster (https://github.com/roice/ntripcaster).
To get the base started I ran a few ubxtool commands:
ubxtool -e RTCM3 -P 20.30 -f /dev/ttyACM0
ubxtool -d NMEA -P 20.30 -f /dev/ttyACM0
ubxtool -p MODEL,2 -P 20.30 -f /dev/ttyACM0
ubxtool -e PPS -P 20.30 -f /dev/ttyACM0
ubxtool -e SURVEYIN3,100,2000 -P 20.30 -f /dev/ttyACM0
It takes around 7 1/2 hours to reach the accuracy of 2000 (20cm right?).
So that seems right compared to the mentions in the ubxtool file.
However the position is far from right.
root@rtk-base ~ # ubxtool -p NAV-SVIN -P 20.30 -f /dev/ttyACM0
UBX-NAV-SVIN:
version 0 reserved1[0 0 0] iTOW 208863000 dur 27251
meanX 371818636 meanY 75095561 meanZ 511048862
meanXHP 33 meanYHP 1 meanZHP -42 reserved2 0 meanAcc 2000
obs 27247 valid 1 active 0
Using https://www.oc.nps.edu/oc2902w/coord/llhxyz.htm or any other ECEF
to LLH translator the values are far off from where we actually are.
Results from the website:
Latitude : 53.41551 deg N
Longitude : 11.41833 deg E
"Actual" Position:
Latitude: 53.59931 11.41833
--
###############################################################
Florian Kiera Tel: (0385) 201 000 58
Logic Way GmbH Geschäftsführer: Andreas Loerzer
Mettenheimer Straße 73 HTTP: http://www.logicway.de
19061 Schwerin email: mailto:florian.kiera@logicway.de
###############################################################
- RTK Base and its accuracy,
Florian Kiera <=
- Re: RTK Base and its accuracy, Florian Kiera, 2022/08/09
- Re: RTK Base and its accuracy, Greg Troxel, 2022/08/09
- Re: RTK Base and its accuracy, Gary E. Miller, 2022/08/09
- Re: RTK Base and its accuracy, Florian Kiera, 2022/08/10
- Re: RTK Base and its accuracy, Gary E. Miller, 2022/08/11
- Re: RTK Base and its accuracy, Gary E. Miller, 2022/08/11
- Re: RTK Base and its accuracy, Florian Kiera, 2022/08/16
- Re: RTK Base and its accuracy, Gary E. Miller, 2022/08/16
- Re: RTK Base and its accuracy, Florian Kiera, 2022/08/18
- Re: RTK Base and its accuracy, Gary E. Miller, 2022/08/18