Carlson BRX7 and Skyplots from Rinex Files
Is there a way to convert Carlson .BIN files to a Rinex, specifically a .24o file that will display all constellations in a sky plot? I use RinexDesktop to convert, however, when I put the .24o through several third party apps I am only able to get the sky plot for the GPS constellations. These apps clearly show that GLONASS, Galileo, Beidou were observed during the Static Observation. It shows each individual satellite and the duration it was observed, however, none of this shows up in the sky plot.
The reason I need this information is that we run a drone mounted LiDAR with its own GNSS that needs to compare it's data with the static GNSS data from the BRX7. However, it needs the sky plots in order to effectively do this. I've tried Carlson Support with no luck.
They are hemispheres painted blue...
this video might help
Carlson has this download:
https://web.carlsonsw.com/files/knowledgebase/kbase05.php?action=display_topic&topic_id=1200
Hey that's me! This should work for any Hemisphere boarded receiver (including the BRx7). If you need the latest Rinex convertor feel free to send me a message.
I'm using the latest Rinex Desktop Converter from Hemisphere (2.0.5.0), but like I said I don't get a sky plot of all constellations from this file. I only get GPS sky plots. If I run other brand GNSS observation files data through RTK Plot or Emlid Studio I get each observed satellite. There has to be a way to see each observed satellite on a sky plot in order to see its azimuth.
See attached photo.
Are you saying that the lidar processing uses those little pictures to do the processing?
No. The purpose of the pictures were to show that the only constellation in the .24o was GPS. The purpose of a skyplot is to see the azimuth location of the satellites at the time they were observed, which is crucial in evaluating which satellites to use and which ones to toss out. I was only only getting GPS.
I was actually able to solve this problem thanks to a fellow at Carlson Support. Rinex Hemisphere does not automatically generate the extensions for the other constellations. If you generate a .24o in the same manner as in the video you will only end up with a GPS based Rinex. Perfectly fine for OPUS, which only uses GPS constellations anyway. However, in order to have all constellations in a .24o generated by Rinex Hemisphere you need to create the navigation Data file for each constellation with the following extensions (yy being the year).
GPS Nav = yyN (.24n)
GLONASS Nav = yyG (.24g)
Galileo Nav = yyL (.24L)
BeiDou Nav = yyF (.24F)
My question has been resolved, but I'm leaving this information for anyone who searches for it later on. This was such a HUGE source of frustration for me, and anyone trying to use a Carlson GNSS receiver with Rinex Hemisphere needs to be made aware of this. Not everyone uses GPS constellations, and not everyone uses Opus.
My thoughts exactly, neither LiDAR or drones should need a "sky plot" as they provide no positional value.
He's getting positional value from the GNSS satellites. He wants to know their azimuth above the horizon so that he can exclude the ones that may not provide the best data. He is using the skyplots to obtain that azimuth information.
The purpose of a skyplot was to show that my observation file only had GPS Satellites in it. I don't know what's so hard to understand about this. Also, a sky plot is extremely useful in finding out the azimuth of the satellite at the time of collection. When dealing with a kinematic GNSS source, like GPS on a drone, a sky plot is EXTREMELY useful. It's not for processing. It's for analyzing the data.
