GNSS research

@gnss_research
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8 Posts
News and tweets related to #GNSS #research, development and applications. Maintained by @mgfernan
GNSS researchDec 4, 2024

The #GNSS community has been using #RINEX as the standard format to exchange GNSS measurements

But this text format is slow to load, which is a problem for #AI applications that need to process huge data volumes

The post below proposes using #Apache #parquet as as a much faster alternative

https://mgfernan.com/posts/parquet_format_for_gnss_measurements/

Using Apache parquet to store and process GNSS measurements – mgfernan

Leverage Apache parquet to store and exchange GNSS measurement, usually stored in RINEX (text-based) format. This format can be quickly loaded in data structures such as pandas DataFrame for efficient data manipulation and processing.

GNSS researchNov 6, 2024
Ever wondered about the huge volume of #GNSS raw measurement data? 🤯 A daily 30-second data file from 2016 onward can easily reach 2.5MB, accumulating to over 1TB annually for #CORS data servers like @nasa CDDIS. You can find further details below! 👇
https://mgfernan.com/posts/gnss_data_data_volume/
On the exploding size of GNSS measurement data files – mgfernan

The rapid growth of GNSS receiver networks, coupled with the proliferation of constellations and signals, has led to an exponential increase in data volume. This post uses the GNSS data repository of the CDDIS GNSS receiver network to illustrate this trend.

GNSS researchOct 23, 2024
Today is October 23rd (aka 10-23), which coincides with the fundamental frequency of the satellite #navigation systems (10.23 MHz). Happy #GNSS day!
GNSS researchOct 21, 2024
Specifications of #CHIMERA, the #GPS equivalent to #Galileo #OSNMA service to protect against #spoofing https://www.gpsexpert.net/chimera-specification
Logan Scott Consulting - CHIMERA Specification

Below is a copy of the IS-AGT-100A signal specification for an L1C security overlay. This specification includes descriptions of both slow and fast channel authentication. The new TESLA variant (IS-IGT-101) is also included here. Also below are copies of some of my papers on this topic as well as

GNSS researchOct 17, 2024
On the #GPS shift in Chinese maps. The article is a bit old, but it explains this issue very clearly. Worth a read!
https://www.serviceobjects.com/blog/why-gps-coordinates-look-wrong-on-maps-of-china/
Why GPS Coordinates Look Wrong on Maps of China

Have you ever tried using Google Maps, Bing or other mapping services to bring up a map of China? If so then you may have noticed that satellite images do

Service Objects Blog
GNSS researchOct 16, 2024
GeomobOct 16, 2024
At the pub #geomobBCN
GNSS researchOct 16, 2024
GeomobOct 16, 2024

Tonight is the night - Geomob Barcelona!

Huge thanks to COWORKIDEA https://coworkidea.com for once again hosting us. Doors open at 6, talks start at 6:30

Talks by Alexander Kamenev, Dan Hirst, Marc Solé Gaset, Alexander Semenov, and Joel Grau Bellet - followed by discussion and networking at the nearby pub.

Thank you Rokubun https://www.rokubun.cat and OpenCage https://opencagedata.com for sponsoring.

Full details:
https://thegeomob.com/post/oct-16th-2024-geomobbcn-details

#geomobBCN

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