| Название | : | How GPS Works, And How It Got Better Than The Designers Ever Imagined |
| Продолжительность | : | 27.20 |
| Дата публикации | : | |
| Просмотров | : | 494 rb |
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your GPS information is all over the map, your mixing 1st gen 2nd GEN and currant technology, the DGPS was used Before SA was turned off, I like the discussion I have a Garmin 66 which is a duel frequency GPS I have been using GPS's all over the world pretty much as soon as civilians could have them I love your program, thanks Comment from : brad hampton |
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Does my cell phone have WAAS? Comment from : TheSkystrider |
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In 1995, a British patent named Clock Cleaner & Jitter Reducer was filed and extended to over 25 countries
brThe inexpensive products were tested at the Imperial Colledge of London and their use was first applied to hard drives which, with perpendicular recording, increased their density from MB to GB and TB
brAdditionally, all mobile phones use this technology to eliminate frequency fluctuations
brFurthermore, a primary application is to align clock speeds on the Earth's surface and slower clocks on satellites Comment from : Evangelos Arkas |
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GPS is a man made wonder! 🙂 Comment from : Bob |
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I thought you were going to cover rtk and similar technology used by surveyors and drone operators Comment from : Bill Michaelson |
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I just don't understand why they didn't make allowance to access the FTS when fully stacked Seems like a couple extendable platforms would do the trick Comment from : Peter Loomis |
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airplanes need gps Comment from : iceberg789 |
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I’m an avionics technician and started working on airplanes with GPS as the norm for long-range navigation But it’s wild to consider pilots are doing synthetic ILS approaches now to land commercial flights and coupled with transponder data, planes can be their own ATC with ADS-B Out and subsequent ADS-B In capabilities brbrAwesome video! Comment from : Shamwao0ow |
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Can Starlink provide the same services in future? Comment from : Sulaiman Lalani |
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What I heard was the original GPS was accurate to 5m but the military intentional put error into the clocks to stop foreign nations for using the public GPS But when Russia launches Glonass there was no need to create this low precision signal Comment from : Justin Dressler |
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Great explanation of how GPS has been improved The geodetic scientists have post-processing methods, which use more accurate orbits for the GPS and other GNSS satellites that are calculated after the fact and other data such as weather models and temporal fitting to remove additional errors due to the troposphere, that can get to centimeter-level precision especially for the average position over a day and millimeter accuracy over a year or less They also use the precise post-processed GPS orbits to improve the orbit accuracy of other satellites that have GPS receivers Those improvements take time so they don't help with real-time navigation Comment from : Eric Fielding |
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In 95 I remember the GPS was about 100 feet but in 99 we had a GPS antenna and little box that plugged into the computer serial port and we had software in the laptop and it was really accuratebrbrWe also had the computer and I think it was wave files, not GPSbrThe DVD or CD player could do regular CDs but we didn't have a DVD player that did MP3 or an MP3 player in 95brbrAnd what we came up with was a small computer running off an inverter in the car, and a small computer screen and a small keyboard and we had a sound card with the line level outputs going into the stereo in auxiliary input to the amplifier and equalizer and we recorded 1500 songs and had them playing on Windows Media player and we could open the glove box and the keyboard was attached to the glove box door and the screen was behind the glove box and we could bring up the sound files and create a playlist and play them through the computer and through the amplifierbrbrIt was a lot of work and people thought we were crazybrbrBy 01 we all had MP3 player and I had my cassette player in the car with a cassette adapter with the 1/8" plug and plugged into my MP3 player and played the mp3 through the stereobrbrWe really have come a long way Comment from : ocsrc |
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So russians while committing another crime against humanity accidentally motivated US to open gps to the public Comment from : Arcgateway |
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Is it possible being nearby an airport to get their GBAS signal for precise positioning and velocity measure? Comment from : mm7 4forums |
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Automatic landing systems have been a thing since just after WW2 (at least publicly) Comment from : Allan Gibson |
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Awesome video, Scott! Comment from : Murat Gurol |
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A nice bottle of Dewar's Scotch in the background Comment from : Richard Rejmer |
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All this accuracy is wonderful except it can be interfered with rendering it useless by terrorist using a modified laptop, hence the reason why it not used in commercial aircraft, Boeing uses 2 IRS systems, Airbus uses 3 The only aircraft that comes from the factory with 1 GPS and 2 IRS's is the 787 which due to possible failure of 1 system use the GPS to verify which one is good (happened on a 777) While not as accurate an error rate of about half kilometer /hr of flight, Example NY to London maximum error is 3 miles and will be less the next time its on that route due to the computer softwareAnd this is why its not used on commercial aircraft I'm a retired airline maintenance engineer avionics Comment from : Rick Palmer |
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And now we have Google and Apple doing their own differential additions to GPS with WiFi AP locations to narrow down a phone's location to within a few meters - or so the location radius data in API responses claims Yet coordinates will still jump to cell tower triangulation and assumed locations will be "adjusted" to static addresses the provider knows about, rather than the obvious solution that the device in question is just sitting at an intersection waiting for the light Comment from : Matt Hielscher |
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The codes are called Gold Codes and actually sent under the white noise Because you know what to expert, RX can see under the noise, which means additional gain, even is signal is very bad Comment from : 🙄 |
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20:00 I remember using a Garmin eTrex (no WAAS) to navigate in the early 2000s I was making tracks for mapping in OpenStreetMap (I got recruited personally by one of the founders (hi tweety_de if you read this! :-)), when GPS satellite #6 was visible, the location was garbage Jumped like half a kilometer Comment from : realulli |
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The satellites all transmit on the same frequency, not just the same band Comment from : Bill Fargo |
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A GPS receiver doesn't need to know the course of the satellites, just their positions brThink Werner Heisenberg's uncertainty principle Comment from : Bill Fargo |
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During Desrt Storm, my Heavy Mortar Platoon had to use LORAN in order to detrmine our position Due to the small number of beacons, it took about 3 minutes to plot our location which drastically slowed our response to a Call For Fire With the rate of march for the armored attack, we never got a shot off as the tanks and BFVs began direct fire on the enemy before we could get rounds out Comment from : Hardcore Preparedness |
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> Way too much detailed informationbrJust needed to show how precision was refined thru a time line Comment from : MyDog Brian |
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There is actually one application you did not mention, which is RTK for agricultural applications This allows tractors to do precision farming with accuracies in the range of 2cm Comment from : fish bed |
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Because the government quit scrambling the signal in the ‘90s Military receivers used the more accurate signal Comment from : Thomas Fx |
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Worth mentioning the predecessor to GPS: the US NAVY’s Transit satellite system This used LEO satellites transmitting ephemeris and timing data at 400MHz and 150MHz The receiver used measurements of the Doppler shift as each satellite transited the sky to calculate a position But the position fix was not continuous so dead-reckoning was needed between fixes brAlso worth mentioning is the fact that satellite XYZ coordinates need to be converted to lat/lon/height using a recognized (and typically locally chosen) spheroid and datum Comment from : tardx |
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We use it farming to run application equipment and planters Comment from : Derek martin |
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19:35 EGNOS only availabme in Portugal, Spain and parts of France and of the UK? Comment from : rfvtgbzhn |
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If airplane autopilots arent putting in an offset to the right when flying between GPS waypoints, they really ought to Two jets over Brazil collided when flying opposite directions between the same to waypoints The accuracy of GPS put them on a head on collision One was climbing, so the altitude separation broke down Horizontal separation by means of an offset would be a good sagety feature to add Comment from : beachcomber |
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Too technical for me Others will get full value from your video Comment from : Jeff Dittrich |
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"I wish I totally understood it"brHe says after 25 minutes of distilling decades of nuanced development, conflict, and resolution for GPS <3 Comment from : Ryv |
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I work with satellite positioning for marine usage We can offer 4 centimetre precision brThat DGNSS explanation you did was very accurate, and we can offer that correction thru a geostationary satellite or even thru internet connectionbrWe cover pretty much all the globe, with hundreds of reference stationsbrbrAbout the height, you can see a better precision under good HDOP values, HDOP indicates the concentration of SVs in the sky When they are more spread, the better is Comment from : Lucas Cavalcante |
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Excellent presentation!
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brThe device you’ve showed is the (navy version) of the Magellan GPS NAV 1000M5 And yes, the M5 supports (field) differential
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brIf it hasn’t been mentioned, the SA is only applied to the C/A code; the P(Y) code is exempt The SA was turned off in the 20's
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brA P(Y) code device requires a special hardware chip and its own software to operate (governments’ controlled)
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brCan you also please describe to the viewers the FOM (Figure of Merit)? Which is; determining the best date/time to determine the best LAT/LON/ELV for the current location (after “ALMANAC COLLECT”)? Cheers Comment from : R G |
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Spoiler alert: it got this good by studying hard and constant practice Comment from : Fernando Sanchez |
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My dad was an engineer at Arnold AFB When I was a kid, I remember him being excited about a new project that they were working on which at the time was called NAVSTAR It would use satellites to aid navigation I remember thinking at the time, “why would you need that? Who would even USE it?”brbrShows what I knew! :) Comment from : Ric Crouch |
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This isnt really related to this video, but I just thought I'd say thank you for being my gateway into aerospace via your steam release ksp vids back in the day :) Comment from : TheLostCause |
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So MH-17 wasn't the first time Russia shot down a civilian plane Comment from : Chris Fairhall |
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I worked at the house of one of the people who designed GPShe was very proud of it and told me many times lol Comment from : Justin Smith |
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The best thing about GPS is that it’s an endangered technology thanks to the Kessler Syndrome StarLink is rushing us towardsbrbrLove GPS? Stop kissing musk’s ass Comment from : Justa Stranger |
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Interesting, you're basically speaking ham radio stuff here It's way more in-depth but ham uses the same kinda idea with the ionosphere and the time and all neat Comment from : Anthony Blacker |
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Thankfully they didn't keep DNSS as the name of GPS, man everyone doing networking would be SO confused!! Comment from : Anthony Blacker |
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Hi Scott, I just saw you at the airport on the East Coast right after watching this video! I decided not to bother you, but I want you to know how much I appreciate what you do You are a modern day renaissance man Fly safe! Comment from : Kyle Rhoades |
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CDMA has been in use by military Satcoms since the 1970s, so GPS is far from being the first use Comment from : CambridgeMart |
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I don't think Scott "missed" anything He doesn't have the time to fit everything into a video Comment from : Mike Asterios |
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Take a shot of fine aged Scotch everytime Scott says "GPS" Cheers! 😁🤟 Comment from : UncleManuel |
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Man, you have proper microphone with pop-filter behind you, why don't you use it for this video? Comment from : Васиссуалий Пупканович |
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SCOTT - WHAT IS RTHE -3DB FREQ RESPONSE for tHE LINeAR MOTORS, SCOTT? Comment from : Stuart Saunders |
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I spy the Expanse series! Comment from : Miss Adventure |
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GPS has improved so much that it was just reported that it can be used to provide up to a 2 hour early warning of an impending earthquake Comment from : YouTube User |
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Wasn't the turn off of civilian jamming triggered by a civilian aircraft being shot down for being at the wrong place? Comment from : Leandro Lima |
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That plane that was 'shot down by the USSR' was an assassination on a certain someone Comment from : pyropulse |
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Has any development addressed the risks of a big CME (coronal mass ejection) or is that no longer an issue?brWould just turning the satellites off be sufficient? I'm sceptical Comment from : Bill Me |
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Isn't GPS based land surveying accurate to a fraction of an inch? How is that done? Comment from : walmartdog1142 |
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VORs and NDBs are being phased out to an extent, but not really DMEs DMEs are in comparison very cheap to install and maintain DME/DME triangulation is quite precise and, if I'm not mistaken, is good enough for RNAV-1 Comment from : Juraj Grivna |
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The real purpose of GPS and other systems is to bomb cities, missiles are very expencive so accuracy is essential So do not full yourself, if today GPS guides you to nearest pizza hut, tumorrow it will guide bombs into somones house Comment from : Little Kishirisu |
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Knowing that my GPS can track me in 3 dimensions, it's maddening that my car's navigation system thinks I'm on a bridge when I'm on a street 30 meters under the bridge Comment from : bridgecross |
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GPS provides wonderful capabilities but its a little scary to think that so much of our infrastructure is dependent on 24 satellites and their ground control station Comment from : Little Shop of Electrons |
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Only problems is that it can be jammed by the enemy AI vision needs to be enhanced for navigation Comment from : Joseph Blogs |
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I don't have to watch the video to tell you why GPS has gotten so good The military turned off the restrictions the military has been using GPS since before Desert Storm(1991), and it was accurate to at least 1 meter(10 digit coordinate, even to 12 digit coordinates), today the military still uses GPS to 1 meter resolution on a regular bases ALL GPS receives, whither military or civilian use the same satellites Comment from : Jason Brown |
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New farm equipment plows and fertilizer at sub-inch GPS accuracy, repeatable year-on-year Comment from : Ted B |
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I think we’ve missed one of the most important use of GPS How a golfer knows the distance to the green when he’s so off track in the trees that he can’t see the flag 😊 Good to hear such a knowledgeable Scottish voice on here Comment from : Justso |
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Once the positional accuracy is within 20 cm (1 wavelength), the receiver can use phase tracking to further refine the distance calculations for each satellite Comment from : Mark Warren |
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I really like the part on vertical variance vs horizontal variance, it made so much sense! Comment from : CW 0114 |
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I didn’t hear anything about adjusting GPS to account for plate tectonics North America is drifting west about 10cm (4 inches) yearly In the 50 or so yrs since GPS became a thing, everything has shifted west by more than just a few feet Comment from : F J Hassard |
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7:40 I once heard CDMA analogized as a "Cocktail Party" code If you're in a room with a bunch of people speaking different languages, you can "focus in" on the language you like FDMA - every pair of people get a tiny room TDMA - everyone takes turns talkingbrbrIt's not perfect - no analogy is - but it helped me "get it" back when I didn't have the math Comment from : Scott G |
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Is there a way to use GPS to track and kill crickets? Comment from : Handley Machine |
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I vaguely remember having to work out my position using a radio receiver plus a pen and paper when I was at University (no computer involved) Comment from : Jon Pennycook |
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I'm just here to see the moronic flat earth comments Comment from : Jeff McLennan |
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I run a bulldozer with a GPS grading system that is accurate to a half an inch Comment from : Anon Emus |
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Hey, what about multi constellation use? Receivers today use a couple satellites from each constellation Comment from : 9peppe |
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I would really love it if you could start making shorter versions of your videos - not "shorts", but say 5-10 min versions I love the content of your videos, but I rarely watch your channel 'cause I don't want to sit through 30 minutes of super detailed explanation Comment from : Vousie V |
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If the airline industry is quietly ditching ground based approach navigation in favor of GPS, isnt that putting all your eggs in one basket?brIf GPS gets knocked out by solar activity (something that happens frequently near Brazil), surely you need a diverse solution to the problem of positioning yourself Comment from : Glynn Morgan |
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I think it would be funny if the opposing satellites that share a frequency didn’t identify themselves so you would boot up your gps to learn you were either in Canada or Australia but with great precision Comment from : AllOfIt |
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Great Video Scott! Info just everyone can understand Comment from : William Stout |
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CDMA, Collision Detection Multiple Access !!! Comment from : Darryl frost |
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My Mother worked for Raytheon, she probably spent the better part of 15 years doing software verification on the WAAS program Interesting concept, measuring ionosphere propagation delay to correct GPS timing Comment from : mtm84a |
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Very cool shirt! I look forward to seeing Minus One Comment from : Justin Belshe |
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We worked with differential GPS in school in the late 90s, only for it to be moot a couple years later Comment from : Eric Gulseth |
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