A New Technique Makes GPS Accurate To An Inch (gizmodo.com) 127
A team from the University of California, Riverside, has developed a technique that augments regular GPS data with on-board inertial measurements from a sensor. Actually, that's been tried before, but in the past it's required large computers to combine the two data streams, rendering it ineffective for use in cars or mobile devices. Instead what the University of California team has done is create a set of new algorithms which, it claims, reduce the complexity of the calculation by several orders of magnitude. In turn, that allows GPS systems in a mobile device to calculate position with an accuracy of just an inch.
This could be really useful for docks and ferries (Score:5, Interesting)
One of the most time consuming parts of a short journey is getting the passenger doors aligned with the port-side gangways. Unlike airports, it's not the gangways that move to the plane, it's the vessel that must align with the portside. Sometimes the portside gangway can move up or down, but many times, the crew have to tie down these mini gangways with ropes when the tides and ballast tanks aren't enough. It takes several minutes of maneuvering to get the ship aligned with the dockside, sometimes even having to reverse and try again, especially in heavy swells. If they could get GPS down to several inches, combined with the sideways movement that many catamarans have, docking could be done automatically.
Re:This could be really useful for docks and ferri (Score:5, Insightful)
Couldn't the same level of 'automatic' be achieved with image recognition cameras at the doors, or other sensors to achieve the same result?
Re:This could be really useful for docks and ferri (Score:5, Funny)
Couldn't the same level of 'automatic' be achieved with image recognition cameras at the doors, or other sensors to achieve the same result?
Why would you want to do it in a simple way?
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Compute power is such today that it seems *very* likely they could just have a live video feed and a touch screen. When you're close enough to the dock to see it, you touch where it is on the screen, then just using that pattern the docking can happen automatically from there on out. Obviously there will still be potential to override it and use manual control (often via lateral thrusters). It should be trivial for something like the lasso tool to grab and recognize a gangway.
And, you know what they say, "G
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Re: This could be really useful for docks and ferr (Score:2)
Scanning Lidar will work. Map it first and run some ICP algorithms. Basically you have a GPS pose and a ICP Lidar corrected pose. Highly accurate if you can map the dock well enough.
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I never knew Juggalos were so concerned with positioning.
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I'm still convinced the 'net could use a "smack user" button. That was horrible and you should be ashamed of yourself! Why, I ought to...
I have a niece who's into that thing. She even wears war paint and goes out to festivals and whatnot. I think they call them gatherings. I've met some of them and I've been given the title of "Honorary Juggalo." That's not exactly something I was looking forward to gaining as an accomplishment but, well... It's something and I guess it's good that they have each other.
The
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One of the most time consuming parts of a short journey is getting the passenger doors aligned with the port-side gangways. Unlike airports, it's not the gangways that move to the plane, it's the vessel that must align with the portside. Sometimes the portside gangway can move up or down, but many times, the crew have to tie down these mini gangways with ropes when the tides and ballast tanks aren't enough. It takes several minutes of maneuvering to get the ship aligned with the dockside, sometimes even having to reverse and try again, especially in heavy swells. If they could get GPS down to several inches, combined with the sideways movement that many catamarans have, docking could be done automatically.
Maybe they'd have better luck with the starboard side.
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That would shift the bottleneck to engine power, and the deliverability of that power. That costs serious coin for any working vessel,
Encrypted (Score:3, Interesting)
Given that we can now use GPS to great accuracy. Does this mean that the US military no longer needs to encrypt the end of the GPS signal? After all, the military has always been able to use GPS for very precise location, whereas civilians had to put up with very coarse location.
Re:Encrypted (Score:5, Informative)
This is incorrect. President Clinton removed selective availability from GPS. That is why we have the location boom today. We are at as accurate a position as we can be with the GPS reception. This happened in 2000. There are other forms of signal degradation that are available. SA is not an issue anymore. I am a professional land surveyor. Multi-pathing is currently your greatest hurdle to overcoming highly accurate positioning. That unfortunately, requires fairly complex calculations to remove it properly. Even with my highly accurate receivers, I have to remove multi-pathing manually sometimes. Reflection is a harsh mistress.
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Which is fine. Most any warzone where they'd turn on SA wouldn't have those towers anyway. And if they did, they wouldn't have them very long.
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You're a moron with no clue what you're talking about.
President Clinton turned off Selective Availability on the C/A (coarse acquisition) signal. The more accurate P(Y) (precision location) signal used by the military is still encrypted [wikipedia.org].
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Re:Encrypted (Score:4, Informative)
The P(Y) code offers a couple of advantages besides anti-spoof
1) Faster code rate for more precise positioning, also offered by the newer civilian signals (L1C, L2C, and L5)
2) It exists on both L1 and L2, allowing the receiver to more accurately model the atmospheric delay terms, reducing that source of error. This is also provided by the L2C and L5 signals, but not all satellites yet transmit them.
Robots will be first in line to use this (Score:2)
I'm sure there will be a lot of obvious applications for this technology, but I can see robotics being a big one.
GPS hasn't been practical for robotics but with this level of accuracy, I wouldn't be surprised to many robotic applications currently being done by humans.
It would be interesting to see how the algorithm keeps its accuracy over time and distance.
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If the new algorithm also helps indoor positioning enough to be accurate over a decent sized floorplan, it could be useful for indoor wifi surveys when deploying or upgrading enterprise networks. Last time I looked there still was not a product that didn't require manual entry of your position on a map during a survey, which is error prone and drives up manpower costs. Eventually WiFi clients could be extended to report back position information to the network so dead spots could be eliminated without a s
Meanwhile (Score:2)
Re:Meanwhile (Score:5, Funny)
No it's not; for the rest of the world it's accurate to 2.54cm.
Re: Meanwhile (Score:2, Informative)
In fact, the paper's abstract says "centimeter-level positioning estimation accuracy can be achieved"...
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Last year we had 2-cm accuracy [slashdot.org]. Now it's been improved to 1-in accuracy.
Don't forget to thank Big Brother for raising the chocolate ration to twenty grammes a week !
Meanwhile in reality... (Score:1)
...nobody actually uses GPS for anything life-critical requiring accuracy, because signals can be jammed/spoofed, and sometimes the calculation is off due to reflections or satellites behaving not as expected.
And by "nobody", I except the military, but nobody notices when they miss their target.
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If you have heavy enough snowfall to completely obscure the road, you probably have thick enough clouds that this level of accuracy becomes difficult again.
Re: Meanwhile in reality... (Score:2)
I can only imagine that you don't realise that GPS is very hit and miss under trees, in deep valleys, near tall buildings, in tunnels parking buildings, etc etc etc.
This is actually just a cheap inertial navigation supplement to GPS and the Summary is highly misleading (they are not improving absolute location at all just using medium drift inertial combined with GPS to stabilise position not improve it in any absolute way).
But don't let facts get in the way of fantasy.. Venture capital to the rescue!
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I can only imagine that you don't realise that GPS is very hit and miss under trees, in deep valleys, near tall buildings, in tunnels parking buildings, etc etc etc.
This is actually just a cheap inertial navigation supplement to GPS and the Summary is highly misleading (they are not improving absolute location at all just using medium drift inertial combined with GPS to stabilise position not improve it in any absolute way).
But don't let facts get in the way of fantasy.. Venture capital to the rescue!
I have a generation-older Garmin GPS that tracks inside buildings ... I can get a lock inside my apartment or in the hallway, and walk down the hall of my apartment (no visible windows) and not lose lock or track. The building is in an area surrounded by trees taller than the peak of the 2-story 64 room unit. There are no supplemental ground stations in the area.
I do know it's possible to get poor reception in a GPS receiver, but in case you were unaware, it's also possible to get excellent coverage in diff
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I have no experience or knowledge of this stealth fighter you speak of. But I do know that plywood as used on aircraft construction has excellent stealth characteristics. Incidentally, the USAF and Northrop-Grumann are both well aware of this.
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The UK RAF used a nice airplane called de Havilland The Mosquito (DH-98) during WWII. There's a documentary about its steal characteristics as well as some known data from WWII about it. It's not that stealthy with today's advanced radar but was quite stealthy back in the day. It was used in a bunch of roles - I can't think of any role that it didn't fill, from bombing to ground attack to reconnaissance - when it was not laden with much in the way of armaments it was speedy, nimble, and made it easy for the
Re: Meanwhile in reality... (Score:2)
Then there is every time an airplane uses GPS to find where the airport and runway are, i.e.an RNAV approach.
...laura
Source (Score:1)
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7349142
Signal (Score:2)
Accurate GPS is good.
But I'd really much prefer a GPS that can work indoors, in cities with tall buildings, near hills and mountains etc.
That seems to have much more uses than getting something from a handful of inches down to fractions of an inch.
My car and phone sometimes get confused about precisely where I am and which turn-off I've taken. And in Belgium (where there are a LOT of underground roads), it barely works at all - by the time it locks on, I've had to go down another tunnel. In Central London
Re:Signal (Score:5, Funny)
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Regarding indoor use: In my home I have erected walls around each room with well defined travel ways identifiable both by visual and tactile means to transition from one room to another. In addition I have labeled each of the designated sleep areas with the appropriate occupant identity. To date this system has proven adequate.
Re: Signal (Score:2)
No. No it's not. The inertial sensors tend to have quite high noise and drift.. And as you need to integrate their signals the error becomes very large very fast. The error levels in silicon sensors makes them of marginal value for inertial sensing for any long term so they require GPS to actually localise them.
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Three Letter Agency response? (Score:2)
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Save money (Score:1)
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That would require your property boundaries to be described in coordinates, rather than beginning at the iron pin 20 feet east south east from the largest oak tree; thence northwest 1 furlong until the stone wall bounding farmer Jones' land. More accurate GPS isn't really going to help you interpret something like this [bid4assets.com]. At least the US doesn't have to deal with issues like changes to the length of a furlong [wikipedia.org] made by Queen El
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https://en.wikipedia.org/wiki/Mile#US_survey_mile
Speaking about odd, what about feet, inches and yards?
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No, sadly it's not even that nice. The State Plane Coordinate System uses "feet" and by feet I mean either the "International Foot" which is defined as .3048 meters or the "U.S. Survey Foot" which is 1200/3937 meters. Sadly both are still in use today.
http://vterrain.org/Projection... [vterrain.org]
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How would you deal with continental drift? North America and Eurasia are moving apart by 2.5 cm per year.
At the very least this could be used to tare or zero the readings from a local survey monument.
Whats funny is the inch is officially defined as 25.4 mm. Dual scale measuring tape confirms this at multiples, as does using a unit converter [google.com]
Galileo is centimeter accurate (Score:1)
Galileo is a European civilian system, and once all 30 satellites are in orbit it will be centimeter accurate by default, with no accuracy degradation at the whim of US military.
The bad news is the US is not happy. And had threatened jamming and shooting down the satellites in time of conflict. For the US this is perpetual or course. Should be interesting as the system is scheduled to be fully operational by 2020.
In related news... (Score:4, Funny)
In turn, that allows GPS systems in a mobile device to calculate position with an accuracy of just an inch.
Dick measuring goes high-tech.
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*BEEP* "Coordinate not found"
CM Level Accuracy (Score:2)
So can I blame Jamie Condliffe for taking an IEEE article in metric and converting to imperial?
After all, Gizmodo is a tech lite site; so you think they would want to culturally lead the way in dropping a unit of measure that no other country uses anymore.
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http://www.zmescience.com/othe... [zmescience.com]
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That's why you should read the real article [phys.org] and not the bad copy gizmodo created.
How? (Score:2)
The accelerometers on the phone are usually not that good, at all. "A mobile device" yes, but that's nothing new - the sensor fusion technology is old (kalman).
Anyone that figured out what the new part is?
Concerns (Score:2)
Is it really as good as they say? (Score:5, Informative)
I used to work at a precision GPS company, on differential GPS. What they would do is have a 'base station' that would stay in a single spot, and average the position from the GPS signal for a period of time. This is because, due to atmospheric interference, the position 'wobbles'.. Once we have an average position, we use that position to come up with correctors to send to the mobile units (via radio modem usually, though other means are possible). This got us to be on par with what this article is claiming.
I wonder if they account for the 'position wobble' of atmospheric interference. I suspect its possible, as they just pick one position they've received, and use the inertial adjust for the correctors. Not much more work than we were doing.
(I didnt write any of the algorithms or anything, just shuffled data around to different devices and libraries.)
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Ahh, finally you have shown me what to do with my antique Garmin GPS-12s. They have serial ports, and I have ESP-01s and level shifters lying around. DGPS, here I come
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As long as they get paid enough, get enough vacation,...
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Aircraft already have enough accuracy to land automatically. Below a certain visibility, we're not even allowed to land manually. Pilots are still required to set everything up, but in principle the technology is there.
The problem is, things fail. Frequently. Short circuits, computer failures, software bugs, mechanical failures, leaks, etcetera. You should see a crew in action during a simulator training session, and you'd be immediately convinced that we're nowhere near fully automatic airplanes no matter
Does phone orientation matter? (Score:2)
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Recent models can measure rotations as well as accelerations. The gyroscopes do drift a little bit, but the orientation vector is kept aligned in the long term using average acceleration (gravity), GPS position changes (horizontal speed vector direction), and the built-in compass (not very accurate, but it helps).
Anyway, I doubt these researchers were using an iPhone, they probably had much better (and more expensive) sensors.
Re: The Fuck Are You Talking About? (Score:2)
Rotfl.
It is so funny when you meet someone who believes all the marketing brochures.
Bolt enough addons to your Camry and out well beat a ferrari also.. Didn't you know. Just add up the marketing numbers.
No.. You must be right. The marketing brochures are right and the hard physical definitions of the actual system itself are wrong.. Yeah.. That's the ticket.
been doing this for about 20 years (Score:2)
As for CPU, it's a 16mhz z80 derivative... no FP.
Re: been doing this for about 20 years (Score:2)
So.. You coded something 20 years so in Matlab that runs on a z80?
Umm. No. Stop making shit up you are just embarrassing yourself.
Yes. Dead reckoning systems are not complicated.. But have many many issues..
But you cannot run MATLAB on a z80.
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But MATLAB has a Z80 simulator, you fecking moron, but if you actually used MATLAB, you wouldn't have made that stupid remark you just made.
Already on the market: Xsens MTi-G (Score:2)
1 Inch ?? (Score:1)