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What might look like an abstract artwork is actually a novel antenna, small enough for a minisatellite, to track global ship traffic from orbit.
Commercial vessels are mandated to transmit Automatic Identification System (AIS) signals, which are used to track maritime traffic – the oceangoing equivalent of air traffic control. The system relies on VHF radio signals with a horizontal range of just 40 nautical miles (74 km), useful within coastal zones and on a ship-to-ship basis, but leaving open ocean traffic largely uncovered.
However, in 2010 ESA fitted an experimental antenna to Europe’s Columbus module of the International Space Station, demonstrating for the first time that AIS signals could also be detected from up in orbit, opening up the prospect of global ship tracking from space.
“Based on our testing, this new prototype designs offers a four-fold increase in ship detection performance,” explains ESA antenna specialist Nelson Fonseca, overseeing the project.
“The AIS detection system on Columbus employs a low-gain ‘whip’ antenna, receiving signals within a very broad beam, with corresponding potential for signal overlap and interference.
“This antenna design combines higher-gain with a more reduced footprint, allowing more of a focus on regions of highest interest, and can also discriminate between polarisations, increasing the likelihood of detection for any individual AIS signal within the antenna field of view.”
In addition, clever engineering has shrunk the overall antenna size to a size where up to five could be hosted on a single cubic-metre minisatellite.
“Despite its name, VHF is quite a low wavelength in space terms, implying a bulky antenna of about 1 m across and half-a-metre thick to operate ideally at that frequency,” Nelson adds.
“But the patterned square-shaped structure on the underlying face of our antenna changes the signal behaviour, enabling us to shrink the design to 50 cm width and 3 cm thickness – making it suitable for hosting on a smaller platform.”
The antenna was developed through ESA’s ARTES Advanced Research in Telecommunications Systems – Advanced Technology programme with Italian companies CGS as prime contractor and MVG as subcontractor in charge of the electrical design.
“CGS and MVG are highly interested in moving forward with the optimisation and environmental qualification of this outstanding antenna element,” explains Andrea Di Cintio, managing the project at CGS. “The next step will be to identify a specific mission and then optimise the design and qualification accordingly.”
“Significant reduction of antenna dimensions and weight without compromising electrical performance was challenging,” adds Andrea Giacomini, lead antenna designer at MVG. “It required a radical change in the design and validation approach. We are proud to have been involved.”
Credit: ESA–G. Porter, CC BY-SA 3.0 IGO
1998 BMW 316i Compact.
Previously registered G2 OTL.
Subsequently re-registered S255 SBJ in June 2025.
Last (extended) MoT test expired in November 2020 (SORN).
No previous keepers.
Car: BMW 316i Compact.
Year of manufacture: 1999.
Date of first registration in the UK: 20th May 1999.
Place of registration: Chelmsford.
Date of last MOT: 7th April 2021.
Mileage at last MOT: 100,621.
Last change of keeper: 9th August 2020
Date taken: 3rd June 2021.
Album: Carspotting 2021
A very basic Compact. Top spotting points if you see one of these now.
Plate comes back to a Piaggio T5 (a scooter?)
My first pass at the building was only three stories, then I added an additional three. If I had to fit the building in a more compact space or if looked out of place in a layout, I could go back to three.
This 1 3/8 inch figure is the DC Comics character The Flash as seen in the game HeroClix. The red and yellow streaks behind him are actually tissue paper.
I believe this is the first toy photo I've posted to Flickr that was lit by my camera's flash. I typically use lamps, flashlights, LEDs, etc.
This image is straight out of the camera: no tweaking, no color processing, no cropping, no nothing.
Submitted to the Flickr group 7 Days of Shooting.
The best words to describe HK's cityscape.
Recently fall in love with the skyscrapers and cityscape, I spent few weekends on wandering around Central to Wan Chai. Look up and look for sth fun!! :)
Car: Hyundai Accent GSi 1.4.
Date of first registration: 9th October 2000.
Registration region: Portsmouth.
Latest recorded mileage: 97,093 (MOT 15th May 2019).
Date taken: 18th March 2020.
Album: Street Spots
I will be using this camera in week 325 of my 52 film cameras in 52 weeks project:
www.flickr.com/photos/tony_kemplen/collections/72157623113584240
The Foxtrot fighter is a modified GARC viper. She's equipped with 2 short-range ballistic guns and 4 low-frequency phase cannons for shield dampening. Though she's low on firepower, she makes up for it with sheer speed. All this coupled with the ability to compact into a small cargo bay makes her a bounty hunter's best friend.
This has got to be my absolute favorite out of all the fighters I have built for the 14x14x6 starfighter challenge because it's just so fun to convert, and it's pretty dang swooshable too.
I initially wanted to have a few small cars that would fit into an autorack, similar to the Vert-A-Pac. The train car didn't work out, but the regular cars did. I will now use them for my LUG's city layout.
oldie but goody.. found an old folder with very old pictures I took in 2003. This one I still love, despite the quality, which is of course not comparable to a photo taken with a DSLR
My prototypes for the 4 hood's i've designed so far.
The two for CV 21mm and CV 25mm are still going through testing at the moment, so aren't yet on sale.
From where I sit at this moment, Orkney seems so remote. It's easy to forget that it sits just off John o' Groats and was a bit of Scotland nibbled away and submerged at the end of the Last Glacial Period. Prior to that, the lowered sea levels left Doggerland high and dry — a convenient stepping stone for humans to repopulate Britain from the rest of Europe. Yes, I've been to the very north of the archipelago, to North Ronaldsay. Today I'm away to South Ronaldsay — ironically juxtaposed at opposite ends from its northern namesake. This won't take me to Orkney's most southerly isle, Stroma, which to be honest has less water between it and Scotland that it has between itself and the rest of Orkney.
Here's a reminder of how compact these islands are. This is the northern tip of Glimps Holm looking back across Lamb Holm to Mainland. By now I've crossed two of the causeways constructed as navigation barriers in WWII. There are what appears to be military installations, there on the cliffs of Lamb Holm. In the middleground lie relics of the block ships sunk here early in WWI. I think this was the SS Numidian, an almost 5000 ton steel hulled steamer scuttled here on 30 December 1914. She was sunk in the company of SS Aorangi, SS Thames and SS Minieh with, I think, Numidian in the shallow water near this spot. I could be wrong. If you need a better answer there's a kind of trainspotters' guide to the wrecks of Scapa Flow.
Orkney is so user-friendly. It's a small place, compact, packed to the gunwales with history; so much that with sea level rise its, Plimsoll line is in peril of disappearing beneath the waves. Getting about is quick and easy; all that and it has a village named Twatt.
If there’s one company in Australia with heaps of dino compactors, that company will be Suez, or SITA as I wish they were still known. Maybe in the past the company had more dino work on a national scale, but the high majority is now subject to their Sydney operations, with most of their bulk bin trucks indeed dino roll-offs. I’m sure the company has a good couple hundred open top containers, compactor containers and integrated units in Sydney, a lot of which appear to be young or freshened up. However, a few years ago I came across one of their older pieces of equipment outside their Wetherill Park transfer station, just sitting on the road unattended while its transporter was somewhere else. I love seeing a compactor just sitting on the road out from a dock, especially at night in the Sydney CBD haha It’s not often you would find a compactor of this capacity being used for garbage, so I think it’s safe to say this is a dry waste container or more likely one for paper and cardboard. You can tell this one is an oldie, with very faded paint and signage, plenty of scratches and a decent amount of rust. You can see the front of the container has been punched inwards... a result of the many times this steel box has been pushed into its resting position by the bail hook and frame. I reckon the “No Parking Day Or Night” signs should feature an additional “Offending Vehicles Will Be Towed” - not hard to do with the truck!
Instructions for my custom models for the Death Star Escape & Compactor are now ready. You can buy downloads on my website
c2
JPEG
211 x 1.6 x 5.6
Picture style custom 7,1,1,2
Focus Range - Manual
Canon Exposure Mode - Manual
Sharpness - 7
Contrast - +1
Saturation - +2
Color Tone - +2
WB
A1, M1
more amber, less red
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Termine für die nächste Mondfinsternis
◦>> 21. Januar 2019: Totale Mondfinsternis
Bei einer totalen Mondfinsternis schlägt auch das Herz von Fotografen höher, denn es bietet sich ein unglaublicher Blick auf den, in kupferrotes Licht getauchten, Mond. Dieser wird aufgrund seiner intensiven Rotfärbung im Volksmund auch als „Blutmond“ bezeichnet.
Die Farbe entsteht durch das Sonnenlicht, das durch die Erdatmosphäre hindurch auf den Mond fällt. Das rote Licht wird bei einer totalen Mondfinsternis am stärksten gebrochen, wohingegen der blaue Anteil des Sonnenlichts bereits in der Erdatmosphäre gebrochen und gestreut wird. Somit ergibt sich ein einzigartiges Fotomotiv.
Totale Mondfinsternis in Deutschland - So entsteht die Finsternis
Eine Mondfinsternis tritt bei Vollmond auf, wenn sich die Erde genau zwischen Sonne und Mond befindet. Die Sonne bescheint hierbei die Erde, welche einen Schatten Richtung Mond wirft. Zieht der Mond durch den Erdschatten (Kernschatten), gibt es eine Mondfinsternis.
Die Besonderheit bei einer totalen Mondfinsternis ist, dass der Mond hierbei vollkommen in den Kernschatten taucht. Bei einer partiellen Mondfinsternis steht er im Gegensatz nur teilweise im Schatten.