{"id":1443,"date":"2023-02-23T23:51:57","date_gmt":"2023-02-23T23:51:57","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=1443"},"modified":"2023-02-23T23:51:57","modified_gmt":"2023-02-23T23:51:57","slug":"mobilerzekeles-gps-helymeghatarozas","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/hu\/technologia\/mobilerzekeles-gps-helymeghatarozas\/","title":{"rendered":"Mobil \u00e9rz\u00e9kel\u00e9s: GPS helymeghat\u00e1roz\u00e1s"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"the-global-positioning-system-gps\">A glob\u00e1lis helymeghat\u00e1roz\u00f3 rendszer (GPS)<\/h2>\n\n\n<p>A glob\u00e1lis helymeghat\u00e1roz\u00f3 rendszer (GPS) egy helymeghat\u00e1roz\u00f3 rendszer, amelyet az Egyes\u00fclt \u00c1llamok V\u00e9delmi Miniszt\u00e9riuma fejlesztett ki katonai c\u00e9lokra. Pontos becsl\u00e9seket ny\u00fajt a helyzetre, sebess\u00e9gre \u00e9s id\u0151re vonatkoz\u00f3an, egy sz\u00e1m\u00edt\u00f3g\u00e9pes h\u00e1l\u00f3zat \u00e9s 24 m\u0171hold konstell\u00e1ci\u00f3ja seg\u00edts\u00e9g\u00e9vel hat\u00e1rozza meg b\u00e1rmely t\u00e1rgy magass\u00e1g\u00e1t, hossz\u00fas\u00e1g\u00e1t \u00e9s sz\u00e9less\u00e9g\u00e9t a F\u00f6ld felsz\u00edn\u00e9n h\u00e1romsz\u00f6gel\u00e9s \u00fatj\u00e1n. A rendszer 1995 \u00f3ta m\u0171k\u00f6dik.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"civil-use-of-gps\">A GPS polg\u00e1ri haszn\u00e1lata<\/h3>\n\n\n<p>A polg\u00e1ri szf\u00e9r\u00e1ban biztons\u00e1gi okokb\u00f3l csak a GPS jelek degrad\u00e1lt r\u00e9szhalmaza enged\u00e9lyezett. Azonban a polg\u00e1ri k\u00f6z\u00f6ss\u00e9g alternat\u00edv\u00e1kat tal\u00e1lt a kiv\u00e1l\u00f3 helymeghat\u00e1roz\u00e1si pontoss\u00e1g el\u00e9r\u00e9s\u00e9re differenci\u00e1lis technik\u00e1k r\u00e9v\u00e9n. Ezek a technik\u00e1k \u00f3ri\u00e1si n\u00f6veked\u00e9st eredm\u00e9nyeztek a polg\u00e1ri alkalmaz\u00e1sokban, \u00e9s jelenleg t\u00f6bb mint 70 GPS vev\u0151 gy\u00e1rt\u00f3 l\u00e9tezik.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"principles-of-operation\">M\u0171k\u00f6d\u00e9si elvek<\/h3>\n\n\n<p>A <a href=\"https:\/\/www.gps.gov\/\" target=\"_blank\" rel=\"noreferrer noopener\">GPS rendszer<\/a> c\u00e9lja b\u00e1rmely pont helyzet\u00e9nek kisz\u00e1m\u00edt\u00e1sa egy koordin\u00e1ta t\u00e9rben (x,y,z), kiindulva a pont t\u00e1vols\u00e1gainak kisz\u00e1m\u00edt\u00e1s\u00e1b\u00f3l legal\u00e1bb h\u00e1rom m\u0171holdhoz, amelyek helyzete ismert. A felhaszn\u00e1l\u00f3 (GPS vev\u0151) \u00e9s egy m\u0171hold k\u00f6z\u00f6tti t\u00e1vols\u00e1got a m\u0171holdr\u00f3l kibocs\u00e1tott jel rep\u00fcl\u00e9si idej\u00e9nek szorz\u00e1s\u00e1val m\u00e9rj\u00fck annak terjed\u00e9si sebess\u00e9g\u00e9vel.<\/p>\n\n\n\n<p>Annak meghat\u00e1roz\u00e1s\u00e1hoz, hogy a r\u00e1di\u00f3jel mennyi id\u0151 alatt utazott, a m\u0171holdak \u00e9s a vev\u0151k \u00f3r\u00e1it ugyanarra az id\u0151re kell be\u00e1ll\u00edtani. Ez az\u00e9rt van, mert mindkett\u0151nek ugyanazt a k\u00f3dot kell kibocs\u00e1tania egyszerre. De m\u00edg a m\u0171holdak \u00f3r\u00e1i nagyon pontosak, a vev\u0151k \u00f3r\u00e1i olcs\u00f3 kvarc oszcill\u00e1torok, amelyek nem pontosak. A szinkronizmusb\u00f3l ad\u00f3d\u00f3 hib\u00e1kkal rendelkez\u0151 t\u00e1vols\u00e1gokat pszeudot\u00e1vols\u00e1goknak nevezik. A vev\u0151k \u00f3r\u00e1inak k\u00fcl\u00f6nbs\u00e9ge egy m\u00e1sik ismeretlen, ami sz\u00fcks\u00e9gess\u00e9 teszi legal\u00e1bb n\u00e9gy m\u0171hold haszn\u00e1lat\u00e1t a vev\u0151k hely\u00e9nek meghat\u00e1roz\u00e1s\u00e1hoz.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"calculation-of-pseudoranges\">Pszeudot\u00e1vols\u00e1gok sz\u00e1m\u00edt\u00e1sa<\/h3>\n\n\n<p>A pszeudot\u00e1vols\u00e1gok sz\u00e1m\u00edt\u00e1s\u00e1n\u00e1l figyelembe veszik, hogy a GPS jelek gyeng\u00e9k, \u00e9s a r\u00e1di\u00f3s\u00e1vban a bolyg\u00f3ra jellemz\u0151 h\u00e1tt\u00e9rzajba mer\u00fclnek. Ez a term\u00e9szetes zaj v\u00e9letlenszer\u0171 impulzusokb\u00f3l \u00e1ll, ami a GPS vev\u0151k \u00e1ltal gener\u00e1lt mesters\u00e9ges pszeudo-v\u00e9letlen k\u00f3d l\u00e9trehoz\u00e1s\u00e1hoz vezet, mint a fluktu\u00e1ci\u00f3k mint\u00e1ja. Minden pillanatban egy m\u0171hold olyan jelet sug\u00e1roz, amelynek mint\u00e1ja megegyezik a vev\u0151 \u00e1ltal gener\u00e1lt pszeudo-v\u00e9letlen sorozattal. Ezen szinkroniz\u00e1ci\u00f3 alapj\u00e1n a vev\u0151 kisz\u00e1m\u00edtja a t\u00e1vols\u00e1got az\u00e1ltal, hogy id\u0151ben elmozd\u00edtja a pszeudo-v\u00e9letlen k\u00f3dj\u00e1t, am\u00edg az nem egyezik a kapott k\u00f3ddal; ez az elmozdul\u00e1s a jel rep\u00fcl\u00e9si idej\u00e9nek felel meg. Ez a folyamat automatikusan, folyamatosan \u00e9s azonnal t\u00f6rt\u00e9nik minden vev\u0151ben.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"ground-stations-and-atomic-clocks\">F\u00f6ldi \u00e1llom\u00e1sok \u00e9s atom\u00f3r\u00e1k<\/h3>\n\n\n<p>B\u00e1r a m\u0171holdak sebess\u00e9ge magas (4 km\/s), pillanatnyi helyzet\u00fcket n\u00e9h\u00e1ny m\u00e9tern\u00e9l kisebb hib\u00e1val lehet becs\u00fclni az el\u0151z\u0151 helyzetek 24-48 \u00f3r\u00e1s id\u0151szakra vonatkoz\u00f3 el\u0151rejelz\u00e9se alapj\u00e1n. A f\u00f6ldi \u00e1llom\u00e1sok id\u0151nk\u00e9nt fel\u00fclvizsg\u00e1lj\u00e1k a m\u0171holdak atom\u00f3r\u00e1it, k\u00e9t c\u00e9zium \u00e9s k\u00e9t rub\u00eddium \u00f3r\u00e1t, k\u00fcldve az efemeriszt \u00e9s az \u00f3r\u00e1k korrekci\u00f3it, mivel az \u00f3r\u00e1k pontoss\u00e1ga \u00e9s a m\u0171holdak p\u00e1ly\u00e1j\u00e1nak stabilit\u00e1sa kulcsfontoss\u00e1g\u00fa a GPS rendszer m\u0171k\u00f6d\u00e9s\u00e9ben.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"sources-of-error-in-gps\">A GPS hibaforr\u00e1sai<\/h2>\n\n\n<p>Sz\u00e1mos hibaforr\u00e1s l\u00e9tezik, amely befoly\u00e1solhatja a GPS m\u00e9r\u00e9seket. N\u00e9h\u00e1ny f\u0151 forr\u00e1s:<\/p>\n\n\n\n<p>\u2022 <strong>Ionoszf\u00e9rikus zavar:<\/strong> Az ionoszf\u00e9ra elektromosan t\u00f6lt\u00f6tt r\u00e9szecsk\u00e9k r\u00e9teg\u00e9b\u0151l \u00e1ll, amelyek befoly\u00e1solhatj\u00e1k a rajta \u00e1thalad\u00f3 r\u00e1di\u00f3jelek sebess\u00e9g\u00e9t.<\/p>\n\n\n\n<p>\u2022 <strong>Meteorol\u00f3giai jelens\u00e9gek:<\/strong> A troposzf\u00e9r\u00e1ban, a F\u00f6ld felsz\u00edn\u00e9hez legk\u00f6zelebb es\u0151 r\u00e9tegben l\u00e9v\u0151 v\u00edzg\u0151z lelass\u00edthatja az elektrom\u00e1gneses jeleket, \u00e9s nehezen korrig\u00e1lhat\u00f3 hib\u00e1kat okozhat a GPS m\u00e9r\u00e9sekben.<\/p>\n\n\n\n<p>\u2022 <strong>\u00d3rapontatlans\u00e1g:<\/strong> M\u00e9g gondos be\u00e1ll\u00edt\u00e1s \u00e9s ellen\u0151rz\u00e9s mellett is, mind a GPS m\u0171holdak atom\u00f3r\u00e1i, mind a vev\u0151k \u00f3r\u00e1i mutathatnak enyhe elt\u00e9r\u00e9seket.<\/p>\n\n\n\n<p>\u2022 <strong>V\u00e1ratlan elektromos interferencia:<\/strong> Az elektromos interferencia hib\u00e1kat okozhat a pszeudo-v\u00e9letlen k\u00f3dok korrel\u00e1ci\u00f3j\u00e1ban vagy a p\u00e1lyasz\u00e1m\u00edt\u00e1sban, ami ak\u00e1r egy m\u00e9teres elt\u00e9r\u00e9seket is eredm\u00e9nyezhet.<\/p>\n\n\n\n<p>\u2022 <strong>T\u00f6bbutas hiba:<\/strong> A GPS jelek visszaver\u0151dhetnek fel\u00fcletekr\u0151l, miel\u0151tt el\u00e9rn\u00e9k a vev\u0151t, ami hib\u00e1kat okozhat a m\u00e9rt t\u00e1vols\u00e1gban. Neh\u00e9z minimaliz\u00e1lni ezt a hib\u00e1t, mivel a GPS antenna k\u00f6rnyezet\u00e9t\u0151l f\u00fcgg.<\/p>\n\n\n\n<p>\u2022 <strong>Szelekt\u00edv el\u00e9rhet\u0151s\u00e9g (S\/A):<\/strong> A katonai sz\u00e1nd\u00e9kosan vezeti be ezt a hibaforr\u00e1st, ami a legnagyobb.<\/p>\n\n\n\n<p>\u2022 <strong>Vev\u0151-m\u0171hold topol\u00f3gia:<\/strong> A l\u00e1that\u00f3 m\u0171holdak t\u00e9rbeli elrendez\u00e9se, amelyet a t\u00e1vols\u00e1gok kisz\u00e1m\u00edt\u00e1s\u00e1hoz haszn\u00e1lnak, befoly\u00e1solhatja a GPS m\u00e9r\u00e9sek pontoss\u00e1g\u00e1t. A fejlett vev\u0151k k\u00e9pesek m\u00f3dos\u00edtani a t\u00e1vols\u00e1gm\u00e9r\u00e9si hib\u00e1t.<\/p>\n\n\n\n<p>Ezek a hibaforr\u00e1sok kategoriz\u00e1lhat\u00f3k azokba, amelyek a m\u0171holdak geometri\u00e1j\u00e1t\u00f3l f\u00fcggenek, \u00e9s azokba, amelyek nem. A szelekt\u00edv el\u00e9rhet\u0151s\u00e9g \u00e9s az \u00f3rahib\u00e1k nem f\u00fcggenek a m\u0171hold alakj\u00e1t\u00f3l, de az ionoszf\u00e9rikus \u00e9s troposzf\u00e9rikus k\u00e9sleltet\u00e9sek \u00e9s a t\u00f6bbutas hib\u00e1k nagyon is f\u00fcggenek a m\u0171hold alakj\u00e1t\u00f3l. Minden GPS helyzetm\u00e9r\u00e9snek van egy \u00e9rt\u00e9ke, amelyet \u2019<a href=\"https:\/\/www.gnss.ca\/app_notes\/APN-029_GPS_Position_Accuracy_Measures_Application_Note.html\" target=\"_blank\" rel=\"noreferrer noopener\">bizonytalans\u00e1g<\/a>\u201d-nak neveznek, amely az \u00f6sszes k\u00fcl\u00f6nb\u00f6z\u0151 hibaforr\u00e1son alapul.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"gps-applications\"><strong>GPS alkalmaz\u00e1sok<\/strong><\/h2>\n\n\n<p>A GPS alkalmaz\u00e1soknak sz\u00e1mos felhaszn\u00e1l\u00e1si ter\u00fclete van, bele\u00e9rtve a navig\u00e1ci\u00f3s seg\u00e9drendszereket, az atmoszf\u00e9rikus \u00e9s f\u00f6ldi t\u00e9rmodellez\u00e9st, valamint a nagy pontoss\u00e1g\u00fa id\u0151m\u00e9r\u00e9st. \u00cdme n\u00e9h\u00e1ny p\u00e9lda a polg\u00e1ri ter\u00fcleteken haszn\u00e1lt GPS rendszerekre:<\/p>\n\n\n\n<p>\u2022 <strong>Atmoszf\u00e9rikus jelens\u00e9gek tanulm\u00e1nyoz\u00e1sa:<\/strong> A GPS jelek hasznosak az id\u0151j\u00e1r\u00e1s-el\u0151rejelz\u00e9si modellek kidolgoz\u00e1s\u00e1ban a troposzf\u00e9r\u00e1ban l\u00e9v\u0151 v\u00edzg\u0151z \u00e1ltal okozott sebess\u00e9gv\u00e1ltoz\u00e1sok elemz\u00e9s\u00e9vel.<\/p>\n\n\n\n<p>\u2022 <strong>Helymeghat\u00e1roz\u00e1s \u00e9s navig\u00e1ci\u00f3 nehezen hozz\u00e1f\u00e9rhet\u0151 r\u00e9gi\u00f3kban:<\/strong> A GPS-t kutat\u00f3 exped\u00edci\u00f3kban haszn\u00e1lj\u00e1k nehezen megk\u00f6zel\u00edthet\u0151 ter\u00fcleteken vagy olyan ter\u00fcleteken, ahol nincsenek t\u00e1j\u00e9koz\u00f3d\u00e1si pontok. Ez seg\u00edt elm\u00e9ly\u00edteni a sarki vagy sivatagi r\u00e9gi\u00f3k ismeret\u00e9t.<\/p>\n\n\n\n<p>\u2022 <strong>Geol\u00f3giai \u00e9s topogr\u00e1fiai modellek:<\/strong> A GPS-t geol\u00f3gusok haszn\u00e1lj\u00e1k a tektonikus lemezek mozg\u00e1s\u00e1nak tanulm\u00e1nyoz\u00e1s\u00e1ra \u00e9s a f\u00f6ldreng\u00e9sek el\u0151rejelz\u00e9s\u00e9re. Alapvet\u0151 eszk\u00f6z a topogr\u00e1fi\u00e1ban is f\u00f6ldm\u00e9r\u00e9sekhez \u00e9s erd\u00e9szeti \u00e9s mez\u0151gazdas\u00e1gi lelt\u00e1rakhoz.<\/p>\n\n\n\n<p>\u2022 <strong>\u00c9p\u00edt\u0151m\u00e9rn\u00f6ki tervez\u00e9s:<\/strong> A GPS-t val\u00f3s id\u0151ben haszn\u00e1lj\u00e1k a nagy terhel\u00e9snek kitett szerkezetek, p\u00e9ld\u00e1ul f\u00e9m- vagy beton szerkezetek deform\u00e1ci\u00f3inak megfigyel\u00e9s\u00e9re.<\/p>\n\n\n\n<p>\u2022 <strong>Automatikus riaszt\u00f3rendszerek:<\/strong> A GPS-t riaszt\u00f3rendszerekben haszn\u00e1lj\u00e1k, amelyek \u00e9rz\u00e9kel\u0151kh\u00f6z kapcsol\u00f3dnak, amelyek figyelik a nagy kock\u00e1zat\u00fa szennyez\u0151 \u00e9s romland\u00f3 \u00e1ruk sz\u00e1ll\u00edt\u00e1s\u00e1t. A riaszt\u00e1s lehet\u0151v\u00e9 teszi a j\u00e1rm\u0171 gyors seg\u00edt\u00e9s\u00e9t.<\/p>\n\n\n\n<p>\u2022 <strong>Jelek szinkroniz\u00e1l\u00e1sa:<\/strong> Az elektromos ipar a GPS-t haszn\u00e1lja a megfigyel\u0151 \u00e1llom\u00e1sok \u00f3r\u00e1inak szinkroniz\u00e1l\u00e1s\u00e1ra, hogy megtal\u00e1lja az elektromos szolg\u00e1ltat\u00e1sban el\u0151fordul\u00f3 hib\u00e1kat.<\/p>\n\n\n\n<p>\u2022 <strong>\u00datmutat\u00e1s a fizikailag h\u00e1tr\u00e1nyos helyzet\u0171ek sz\u00e1m\u00e1ra:<\/strong> GPS rendszereket fejlesztenek vak emberek v\u00e1rosi navig\u00e1ci\u00f3j\u00e1nak seg\u00edt\u00e9s\u00e9re. Tanulm\u00e1nyozz\u00e1k a turizmusban val\u00f3 felhaszn\u00e1l\u00e1s\u00e1t is, hogy optimaliz\u00e1lj\u00e1k az \u00fatvonalakat a k\u00fcl\u00f6nb\u00f6z\u0151 helyek k\u00f6z\u00f6tt egy \u00fatvonalon.<\/p>\n\n\n\n<p>\u2022 <strong>J\u00e1rm\u0171flott\u00e1k navig\u00e1ci\u00f3ja \u00e9s ir\u00e1ny\u00edt\u00e1sa:<\/strong> A GPS-t \u00fatvonaltervez\u00e9sre \u00e9s j\u00e1rm\u0171flotta-ir\u00e1ny\u00edt\u00e1sra haszn\u00e1lj\u00e1k olyan szervezetek, mint a rend\u0151rs\u00e9g, a ment\u0151szolg\u00e1latok, a taxi\u00e1llom\u00e1sok, a fut\u00e1rszolg\u00e1latok \u00e9s a sz\u00e1ll\u00edtm\u00e1nyoz\u00f3 c\u00e9gek.<\/p>\n\n\n\n<p>\u2022 <strong>Polg\u00e1ri rep\u00fcl\u00e9si rendszerek:<\/strong> A GPS-t a polg\u00e1ri rep\u00fcl\u00e9sben haszn\u00e1lj\u00e1k a navig\u00e1ci\u00f3s \u00e9s lesz\u00e1ll\u00e1si m\u0171veletek seg\u00edt\u00e9s\u00e9re. Fontoss\u00e1ga miatt olyan rendszerek fejleszt\u00e9se indult el, amelyek a GPS pontoss\u00e1g\u00e1nak jav\u00edt\u00e1s\u00e1t c\u00e9lozz\u00e1k.<\/p>\n\n\n\n<p>\u2022 <strong>Seg\u00edts\u00e9g n\u00e9lk\u00fcli j\u00e1rm\u0171navig\u00e1ci\u00f3:<\/strong> A GPS-t be\u00e9p\u00edtik a DGPS rendszerekbe a pontos man\u0151verez\u00e9s \u00e9rdek\u00e9ben intenz\u00edv forgalm\u00fa ter\u00fcleteken, auton\u00f3m sz\u00e1razf\u00f6ldi j\u00e1rm\u0171vekben, ellens\u00e9ges k\u00f6rnyezetek megfigyel\u00e9s\u00e9ben \u00e9s tehersz\u00e1ll\u00edt\u00e1sban.<\/p>\n\n\n\n<p>A GPS m\u00e9r\u00e9sek nagy pontoss\u00e1g\u00e1val fontos el\u0151rel\u00e9p\u00e9sek t\u00f6rt\u00e9ntek az alacsony p\u00e1ly\u00e1j\u00fa \u0171rben. A robotok most m\u00e1r \u00f6n\u00e1ll\u00f3an v\u00e9gezhetnek vesz\u00e9lyes munk\u00e1kat, p\u00e9ld\u00e1ul mesters\u00e9ges m\u0171holdak ellen\u0151rz\u00e9s\u00e9t, jav\u00edt\u00e1s\u00e1t \u00e9s \u00f6sszeszerel\u00e9s\u00e9t.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"the-future-of-gps\"><strong>A GPS j\u00f6v\u0151je<\/strong><\/h2>\n\n\n<p>1996-ban a GPS rendszerekre vonatkoz\u00f3 szab\u00e1lyoz\u00e1sok meghat\u00e1rozt\u00e1k, hogy a szelekt\u00edv el\u00e9rhet\u0151s\u00e9get 2006-ban megsz\u00fcntetik, \u00e9s egy tov\u00e1bbi frekvenci\u00e1t vezetnek be polg\u00e1ri haszn\u00e1latra. Ez azt jelenti, hogy n\u00e9h\u00e1ny \u00e9ven bel\u00fcl,<a href=\"https:\/\/www.gps.gov\/systems\/gps\/modernization\/civilsignals\/\" target=\"_blank\" rel=\"noreferrer noopener\"> a GPS m\u0171holdak polg\u00e1ri k\u00f3dot fognak sug\u00e1rozni mind az L2, mind az L1 frekvenci\u00e1n<\/a>. Ez redundanci\u00e1t hoz l\u00e9tre, amely lehet\u0151v\u00e9 teszi az ionoszf\u00e9rikus hib\u00e1k becsl\u00e9s\u00e9t, \u00e9s abszol\u00fat m\u00f3d\u00fa pontoss\u00e1got biztos\u00edt, hasonl\u00f3an ahhoz, amit differenci\u00e1lis technik\u00e1kkal lehet el\u00e9rni. Az L1 frekvenci\u00e1n l\u00e9v\u0151 jel v\u00e1ltozatlan marad, \u00edgy a jelenlegi vev\u0151k tov\u00e1bbra is m\u0171k\u00f6dhetnek.<\/p>\n\n\n\n<p>A vez\u00e9rl\u0151 szegmenst jav\u00edtani fogj\u00e1k egy \u00faj vez\u00e9rl\u0151rendszer ind\u00edt\u00e1s\u00e1val, amely jelenleg a tervez\u00e9si f\u00e1zisban van, a szak\u00e9rt\u0151i \u00e1llom\u00e1s sz\u00e1m\u00e1ra. Ez \u00f6sszesen h\u00fasz megfigyel\u0151 \u00e1llom\u00e1st foglal majd mag\u00e1ban, ami pontosabb ellen\u0151rz\u00e9st eredm\u00e9nyez az efemeriszek \u00e9s a m\u0171holdak \u00f3r\u00e1i felett.<\/p>\n\n\n\n<p>Azonban a jelenlegi GPS, GLONASS \u00e9s GPS\/GLONASS navig\u00e1ci\u00f3s rendszerek nem k\u00e9pesek megfelelni a szigor\u00fa biztons\u00e1gi el\u0151\u00edr\u00e1soknak, amelyeket n\u00e9h\u00e1ny polg\u00e1ri alkalmaz\u00e1s, p\u00e9ld\u00e1ul a l\u00e9gi navig\u00e1ci\u00f3 megk\u00f6vetel. A rendszer m\u0171k\u00f6d\u00e9s\u00e9vel kapcsolatos hib\u00e1k felhaszn\u00e1l\u00f3i \u00e9rtes\u00edt\u00e9se egy m\u00e1sodperct\u0151l, amikor a hiba a m\u0171holdon t\u00f6rt\u00e9nik, t\u00f6bb \u00f3r\u00e1ig is tarthat, ha a vez\u00e9rl\u0151 szegmens \u00e9szleli a hib\u00e1t.<\/p>\n\n\n\n<p>Ezen h\u00e1tr\u00e1nyok megold\u00e1s\u00e1ra Eur\u00f3pa fejleszti az <a href=\"https:\/\/www.esa.int\/Applications\/Navigation\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">EGNOS <\/a>(European Geostationary Navigation Overlay Service) rendszert, amely 2003-ban lesz m\u0171k\u00f6d\u0151k\u00e9pes. Ez a rendszer megfelel a l\u00e9gi navig\u00e1ci\u00f3 biztons\u00e1gi el\u0151\u00edr\u00e1sainak az\u00e1ltal, hogy 34 fix vev\u0151antenna (RIMS) h\u00e1l\u00f3zat\u00e1t telep\u00edti a f\u00f6ld\u00f6n a GPS jelek fogad\u00e1s\u00e1ra \u00e9s a helymeghat\u00e1roz\u00e1si hib\u00e1k cs\u00f6kkent\u00e9s\u00e9re. Ezeket a jeleket egy vez\u00e9rl\u0151k\u00f6zpontba k\u00fcldik, ahol a m\u0171holdinform\u00e1ci\u00f3t kalibr\u00e1lj\u00e1k, m\u00e9rve a lehets\u00e9ges hib\u00e1t annak kijav\u00edt\u00e1s\u00e1ra, majd \u00fajra elk\u00fcldik 10 f\u00f6ldi \u00e1llom\u00e1sra. Ezenk\u00edv\u00fcl ezeket a jeleket k\u00e9t \u00faj geostacion\u00e1rius INMARSAT m\u0171holdra k\u00fcldik, amelyek 35 000 km magass\u00e1gban helyezkednek el, \u00e9s ism\u00e9tl\u0151k\u00e9nt m\u0171k\u00f6dnek, \u00e9s a jeleket a felhaszn\u00e1l\u00f3khoz k\u00fcldik. Mind az Egyes\u00fclt \u00c1llamok (<a href=\"https:\/\/skybrary.aero\/wide-area-augmentation-system-waas\" target=\"_blank\" rel=\"noreferrer noopener\">WAAS: Sz\u00e9les K\u00f6r\u0171 Kieg\u00e9sz\u00edt\u0151 Rendszer<\/a>), mind Jap\u00e1n (<a href=\"https:\/\/gssc.esa.int\/navipedia\/index.php\/MSAS_Space_Segment\" target=\"_blank\" rel=\"noreferrer noopener\">MTSAS<\/a>: MTSAT Satellite-Based Augmentation System) hasonl\u00f3 szolg\u00e1ltat\u00e1sokon dolgozik.<\/p>\n\n\n\n<p><a href=\"https:\/\/joinup.ec.europa.eu\/collection\/rolling-plan-ict-standardisation\/european-global-navigation-satellite-system-egnss\" target=\"_blank\" rel=\"noreferrer noopener\">Eur\u00f3pa elind\u00edtja a GNSS-1<\/a>, -et is, amely a \u201cGlob\u00e1lis Navig\u00e1ci\u00f3s M\u0171holdrendszer 1\u201d r\u00f6vid\u00edt\u00e9se. Ez a rendszer kombin\u00e1lja a GPS, a GLONASS, az EGNOS, a WAAS \u00e9s az MTSAS szolg\u00e1ltat\u00e1sait. Ez lesz az els\u0151 l\u00e9p\u00e9s egy eur\u00f3pai helymeghat\u00e1roz\u00f3 rendszer (GNSS-2 vagy Galileo) fel\u00e9, amely eur\u00f3pai m\u0171holdak konstell\u00e1ci\u00f3j\u00e1t fogja haszn\u00e1lni.<\/p>\n\n\n\n<p>V\u00e9g\u00fcl meg kell jegyezni, hogy az elk\u00f6vetkez\u0151 \u00f6t \u00e9vben a GPS \u00e9s a GPS\/GLONASS lesz az egyetlen m\u0171holdakon alapul\u00f3 helymeghat\u00e1roz\u00f3 rendszer, amely m\u0171k\u00f6d\u0151k\u00e9pes lesz.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"in-conclusion\">\u00d6sszefoglalva<\/h2>\n\n\n<p>A magas szint\u0171 pontoss\u00e1g el\u00e9r\u00e9se megk\u00f6veteli a GPS m\u00e9r\u00e9si hib\u00e1inak eredet\u00e9nek ismeret\u00e9t. A NOAA GPS Toolbox alapvet\u0151 eszk\u00f6z a GPS technol\u00f3gi\u00e1val dolgoz\u00f3 kutat\u00f3k \u00e9s m\u00e9rn\u00f6k\u00f6k sz\u00e1m\u00e1ra, mivel hasznos szoftvereket \u00e9s forr\u00e1sokat k\u00edn\u00e1l a pontatlans\u00e1gok cs\u00f6kkent\u00e9s\u00e9re.<\/p>","protected":false},"excerpt":{"rendered":"<p>The Global Positioning System (GPS) The Global Positioning System (GPS) is a location system developed by the United States Department of Defense for military purposes. It provides accurate estimates of\u2026 <a class=\"more-link\" href=\"https:\/\/securitybriefing.net\/hu\/technologia\/mobilerzekeles-gps-helymeghatarozas\/\">Folytat\u00e1s <span class=\"screen-reader-text\">Mobil \u00e9rz\u00e9kel\u00e9s: GPS helymeghat\u00e1roz\u00e1s<\/span><\/a><\/p>","protected":false},"author":3,"featured_media":1452,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-1443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mobile Sensing: GPS Location | Security Briefing<\/title>\n<meta name=\"description\" content=\"Discover the sources of error in GPS measurements and how the NOAA GPS Toolbox can help. 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