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NASA explores upper limits of GNSS for Artemis Mission
By Lurker,
The Artemis generation of lunar explorers will establish a sustained human presence on the Moon, prospecting for resources, making revolutionary discoveries and proving technologies key to future deep space exploration.
To support these ambitions, NASA navigation engineers from the Space Communications and Navigation (SCaN) program are developing a navigation architecture that will provide accurate and robust position, navigation and timing (PNT) services for the Artemis missions. GNSS sign
U.S. ally receiving modern military GPS user equipment
By Lurker,
Germany is the first United States ally to order the new military code (M-code)-capable Military GPS User Equipment (MGUE).
The Space and Missile Systems Center’s Space Production Corps achieved the major milestone on Sept. 30, when GPS Foreign Military Sales (FMS) office received its first M-code MGUE order.Germany is expected to receive delivery of its first M-code receivers this year.
SMC is facilitating international access and availability of M-code user equipment as directed by t
The Sea of Galilee’s Water Levels are on the Rise
By Lurker,
The Sea of Galilee (also known as the Sea of Tiberias, Lake Tiberias, Lake of Gennesaret, and Lake Kinneret), located in northeast Israel, is the world’s lowest freshwater lake. After the Dead Sea, the Sea of Galilee is the world’s second-lowest lake in the world.
The lake measures 21 kilometers (13 miles) north-south, and it is only 43 meters (141 feet) deep.
Most of the inflow of water to the Sea of Galilee arrives via the Jordan River from the north, although some underground spring
The Use of Gravimetry Satellites for Measuring Ice and Sea Level Change
By Lurker,
According to the National Snow and Ice Data Center in the United States, about 69% of freshwater supplies are stored in Earth’s ice sheets and glaciers. This means measuring water content in ice and glaciers is critical to understanding future changes to water supplies as well as sea level rise, where melting glaciers and ice sheets are the biggest contributing factor in this rise.
Modern satellites now allow us to make more accurate mass measurements to large areas covered by ice, which al
Thoughts about Mapbox 2.0 becoming Proprietary
By MarcusP,
I am an avid user of the Mapbox JS library, and I use to map points of interest in some of our projects, like locations of survey targets for monitoring purposes.
https://www.mapbox.com/mapbox-gljs
THe latest branch now includes improved support for 3D terrain, but I am still nt seeing support for negative elevations- i.e underground.
But with the news that Mapbox 2.0 is no longer open source, What are your thoughts about it?
Certainly it has an imapct on the projects th
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GPS is an incredible piece of modern technology. Not only does it allow for locating objects precisely anywhere on the planet, but it also enables the turn-by-turn directions we take for granted these days — all without needing anything more than a radio receiver and some software to decode the signals constantly being sent down from space. [Chris] took that last bit bit as somewhat of a challenge and set off to write a software-defined GPS receiver from the ground up. As GPS started as a military technology, the level of precision needed for things like turn-by-turn navigation wasn’t always available to civilians. The “coarse” positioning is only capable of accuracy within a few hundred meters, so this legacy capability is the first thing that [Chris] tackles here. It is pretty fast, though, with the system able to resolve a location in 24 seconds from cold start and then displaying its information in a browser window. Everything in this build is done in Python as well, meaning that it’s a great starting point for investigating how GPS works and for building other projects from there. The other thing that makes this project accessible is that the only other hardware needed besides a computer that runs Python is an RTL-SDR dongle. These inexpensive TV dongles ushered in a software-defined radio revolution about a decade ago when it was found that they could receive a wide array of radio signals beyond just TV. source: Hackaday and GitHub - chrisdoble/gps-receiver
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