"GNSS on the moon: Lunar PNT era begins" by GPS World - #NASA experiment on commercial Blue Ghost lunar lander verified sensitive #GNSS receivers can use weak radio signals from far-away Earth orbit for positioning, navigation & timing #PNT in lunar orbit and on the surface. https://www.gpsworld.com/gnss-on-the-moon-lunar-pnt-era-begins/ #GPS #Galileo #Moon
@markd @revk @nowster @jasonkarns @jjcelery Another issue with using GPS to distribute tzdata is that many IoT devices are inside buildings, and #GNSS works really badly (or not at all) unless you have a line-of-sight to satellites. Another is that (unless your device already needs the GPS chip for its other functions) that it is unnecessary increasing hardware cost. And Internet-of-Things things are usually connected to Internet, so updating tzdata via Internet is literally single line of code.
@markd @revk @nowster @jasonkarns @jjcelery Not really, SBAS bandwidth is only marginally better (at 250bps, and obviously, you'd only get a percentage of that). Also, "diffs" and "git" ideas won't work, as #GNSS user-segment is unidirectional (i.e. receive-only) and you need bidirectional comms for them to work out what diffs are needed. And anyway, as IoT motto is least-effort, and they can't be bothered to do tzdata 'net update, I wouldn't hold much hope even if SBAS were to broadcast it...
Satellite Navigation Systems Facing Rising Jamming and Spoofing Attacks – Source:hackread.com https://ciso2ciso.com/satellite-navigation-systems-facing-rising-jamming-and-spoofing-attacks-sourcehackread-com/ #1CyberSecurityNewsPost #CyberSecurityNews #cybersecurity #Vulnerability #CyberAttacks #CyberAttack #Technology #Satellite #Hackread #Maritime #security #Spoofing #Jamming #GNSS #GPS
"Writing A GPS Receiver From Scratch" by @hackaday - Hackaday writes about a Github project by Chris Doble which uses Python scripts on a RTL-SDR software defined radio receiver to implement a GPS receiver in software. https://hackaday.com/2025/03/18/writing-a-gps-receiver-from-scratch/ #GPS #GNSS #PNT #space #software #engineering #radio #tech
@chad a little far, over in #YXU - still need to get a few things like #GNSS module, battery pack and antenna - but am thinking that getting #meshtastic working is going to be important in the near future...
@karsbehr @ulrichkelber nun, #Galileo ist ein #SBAS, kein #GNSS weil zugunsten der #USA 'downgraded' zu schlechterer #Störsicherheit as #GPS...
https://hackergadgets.com/products/uconsole-rtl-sdr-lora-gps-rtc-usb-hub-all-in-one-extension-board
This looks very, very cool... Hopefully, I'll get a beta kit. I'm excited to test it out, regardless.
@alexlunaview that, alongside #nerfing #Galileo into an #SBAS instead of #GNSS to appease #US #hegemony is a crucial mistake!
https://en.wikipedia.org/wiki/Galileo_(satellite_navigation)#Tension_with_the_United_States
Les gens qui font de la carto pour #OpenStreetMap, vous sauriez si on peut utiliser Josm (ou autre) pour dessiner des polygones selon des dimensions connues ? (un peu comme sur Solidworks)
Concrètement, je voudrais dessiner un nouveau bâtiment qui n'est pas encore sur le cadastre, ni sur aucune vue aérienne, mais j'ai un télémètre laser et du temps libre donc je pourrais prendre toutes ses mesures et faire un plan de masse sur papier, mais il faudrait ensuite que je puisse le reporter sur OSM...
Autre question en lien : vous auriez un bon récepteur #GNSS / #GPS submétrique (mais plutôt léger / compact) à conseiller ? 
GNSS Signals Tracked on the Moon By LuGRE - As part of the payloads on the Firefly Blue Ghost Mission 1 (BGM1) that recently t... - https://hackaday.com/2025/03/07/gnss-signals-tracked-on-the-moon-by-lugre/ #space #gnss #moon
We are very happy to welcome 2 new researchers on the team:
- Lorenzo Capaldo will work on the development of #GNSS-jamming resistant #drone swarms in the EDF project #EDF_STEALTH
- Pedro Rocha will work on #demining robotics solutions for the detection of hidden threats in the EDF project #EDF_AIDEDex
Yes, Virginia, there are #GPS signals on the #moon. After Firefly Aerospace's #BlueGhost landed on the moon's surface earlier this week, the on-board #LuGRE project demonstrated that GPS signals from earth's man-made satellites could also be used for localization on the moon. Sets the record for highest altitude #GNSS signal acquisition!
#NASA
https://www.nasa.gov/general/nasa-successfully-acquires-gps-signals-on-moon/
They like to use the word "quantum" a lot, but it sounds a bit like dead reckoning. #GPS / #GNSS relies on very weak signals - could we not just use a system like #LORAN which has stronger localised transmitters?
https://www.bbc.co.uk/news/articles/cq6yg204pvmo
"While GPS is satellite-based, the new system is quantum-based - a term used to describe tech that is reliant on the properties of matter at very small scales."
#NASA:
"
Blue Ghost Prepares for Landing, NASA Instrument Breaks Record
Firefly’s Blue Ghost Mission 1 is nearly one week away from its Moon landing on Sunday, March 2, after launching on Jan.15.
"
https://blogs.nasa.gov/artemis/2025/02/21/blue-ghost-prepares-for-landing-nasa-instrument-breaks-record/
21.2.2025
Airborne LiDAR - A Tutorial For 2025
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https://lidarmag.com/2024/12/30/airborne-lidar-a-tutorial-for-2025/ <-- shared technical article / tutorial
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#GIS #spatial #mapping #LiDAR #tutorial #remotesensing #elevation #topography #measurement #DTM #DEM #airborne #vegetation #pointcloud #multipleparts #onlinelearning #3d #onlinelearning #learning #sensor #surveygrade #drone #plane #ROV #UAV #laser #bathymetry #GPS #GNSS
I am on the verge of buying an e-ink screen for an #esp32 board and start a vendetta against #garmin by making a foretrex of my own that will be used as an #aprs/lora and whatnot terminal besides navigation.
While #foretrex is still the least #enshittified device Garmin makes, it having bluetooth and can do crap with it drives me crazy. My radio, my gps, my pc have BT and non can talk to each other.
What do you think?
A distributed network of sensors, millions of Android phones, to provide a precise image of the ionosphere and improve GNSS system corrections and therefore location accuracy #gnss
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Greg Cocks 
