{"id":3621,"date":"2011-07-14T17:16:29","date_gmt":"2011-07-14T14:16:29","guid":{"rendered":"http:\/\/vaxxi.net\/log\/?p=3621"},"modified":"2011-07-14T17:17:57","modified_gmt":"2011-07-14T14:17:57","slug":"gps-ultra-rapid-pe-android","status":"publish","type":"post","link":"https:\/\/vaxxi.net\/log\/gps-ultra-rapid-pe-android\/","title":{"rendered":"gps ultra-rapid pe android"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/vaxxi.net\/log\/wp-content\/uploads\/2011\/07\/1-150x150.png\" alt=\"\" title=\"GPS info\" width=\"150\" height=\"150\" class=\"alignleft size-thumbnail wp-image-3622\" \/>Tot s\u0103p\u00e2nd dup\u0103 diverse set\u0103ri (\u00een continuarea articolului despre <a href=\"http:\/\/vaxxi.net\/log\/gps-asistat-a-gps-pe-android\/\">GPS asistat pe Android<\/a>) am mai g\u0103sit o idee interesant\u0103, care s-a dovedit foarte practic\u0103.<\/p>\n<p><!--more--><\/p>\n<p>Concret:<\/p>\n<ul>\n<li>pozi\u021bionarea pe un telefon Android (\u0219i un smartphone \u00een general) se face prin 3 metode mari \u0219i late: network location (\u00een func\u021bie de celulele GSM la care este conectat telefonul), WiFi location (\u00een func\u021bie de re\u021beaua WiFi la care este conectat telefonul) \u0219i GPS location (prin recep\u021bia semnalelor satelit).<\/li>\n<li>network location \u0219i WiFi location folosesc o baz\u0103 de date predefinit\u0103 cu pozi\u021bia geografic\u0103 a celulelor\/ruterului WiFi (IP geolocation). Merg aproape instant, necesit\u0103 conexiune la internet.<\/li>\n<li>GPS location nu necesit\u0103 conexiune internet, dar poate fi ajutat\u0103 prin desc\u0103rcarea efemeridelor (un fi\u0219ier ce con\u021bine pozi\u021bia curent\u0103 a sateli\u021bilor GPS \u0219i care este valabil doar o s\u0103pt\u0103m\u00e2n\u0103). C\u00e2nd un chip GPS are semnal suficient de puternic de la un num\u0103r suficient de sateli\u021bi, se cheam\u0103 c\u0103 s-a f\u0103cut un &#8220;gps fix&#8221; \u0219i precizia pozi\u021bion\u0103rii este suficient de mare (\u00een general, sub 100 metri).<\/li>\n<li>Un GPS fix se poate ob\u021bine &#8220;la rece&#8221; (de exemplu c\u00e2nd aparatul a fost oprit) sau &#8220;la cald&#8221; (c\u00e2nd s-a ob\u021binut o pozi\u021bionare anterioar\u0103 \u0219i chipul GPS este reactivat dup\u0103 o perioad\u0103). Durata ob\u021binerii pozi\u021biei precise poate fi de la c\u00e2teva minute pentru un cold fix p\u00e2n\u0103 la c\u00e2teva secunde pentru un hot fix. Durata depinde \u0219i de vizibilitatea cerului, condi\u021biile atmosferice, vreme, etc.<\/li>\n<\/ul>\n<p>Eh, numai c\u0103 sunt situa\u021bii c\u00e2nd folose\u0219ti un program de naviga\u021bie care se bazeaz\u0103 doar pe GPS \u0219i ai nevoie de un GPS fix rapid, pentru ca programul s\u0103 \u0219tie pozi\u021bia curent\u0103 \u0219i s\u0103 po\u021bi calcula o rut\u0103. Av\u00e2nd o pozi\u021bie ini\u021bial\u0103 estimativ\u0103, po\u021bi porni la drum lini\u0219tit iar GPS-ul \u00ee\u0219i va stabili conexiunea pe parcurs. <\/p>\n<p>Trucul de mai jos realizeaz\u0103 fix asta: odat\u0103 ini\u021bializat chipul GPS din telefonul cu Android, aplica\u021bia care folose\u0219te GPS-ul va crede c\u0103 prime\u0219te un GPS fix aproape imediat. \u00cen realitate, pozi\u021bionarea ini\u021bial\u0103 este pe baza celulelor GSM\/WiFi \u0219i are o eroare destul de mare (1-2 km de obicei prin ora\u0219e, 10-20 km \u00een afara lor). Cu toat\u0103 eroarea asta, pozi\u021bionarea e suficient de bun\u0103 pentru a porni navigarea. Ulterior, pe m\u0103sur\u0103 ce sateli\u021bii sunt recep\u021biona\u021bi corespunz\u0103tor, precizia pozi\u021bion\u0103rii se va \u00eembun\u0103t\u0103\u021bi ajung\u00e2nd la nivel de metri (&#8220;adev\u0103ratul GPS fix&#8221;, ca s\u0103 zic a\u0219a).<\/p>\n<p>Bun, ce trebuie f\u0103cut pentru asta: se remonteaz\u0103 parti\u021bia system din telefon cu adb (<code>adb remount \/system rw<\/code>) \u0219i se \u00eenlocuie\u0219te con\u021binutul fi\u0219ierului \/system\/etc\/gps.conf cu urm\u0103toarele:<\/p>\n<p><code><br \/>\nNTP_SERVER=1.ro.pool.ntp.org<br \/>\nNTP_SERVER=ro.pool.ntp.org<br \/>\nNTP_SERVER=europe.pool.ntp.org<br \/>\nXTRA_SERVER_1=http:\/\/xtra1.gpsonextra.net\/xtra.bin<br \/>\nXTRA_SERVER_2=http:\/\/xtra2.gpsonextra.net\/xtra.bin<br \/>\nXTRA_SERVER_3=http:\/\/xtra3.gpsonextra.net\/xtra.bin<br \/>\nSUPL_HOST=supl.google.com<br \/>\nSUPL_PORT=7276<br \/>\nDEBUG_LEVEL=0<br \/>\nINTERMEDIATE_POS=1<br \/>\nACCURACY_THRES=5000<br \/>\nREPORT_POSITION_USE_SUPL_REFLOC=1<br \/>\nENABLE_WIPER=1<br \/>\nSUPL_NO_SECURE_PORT=7276<br \/>\nSUPL_SECURE_PORT=7276<br \/>\nCURRENT_CARRIER=common<br \/>\nDEFAULT_AGPS_ENABLE=TRUE<br \/>\nDEFAULT_SSL_ENABLE=FALSE<br \/>\nDEFAULT_USER_PLANE=TRUE<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tot s\u0103p\u00e2nd dup\u0103 diverse set\u0103ri (\u00een continuarea articolului despre GPS asistat pe Android) am mai g\u0103sit o idee interesant\u0103, care s-a dovedit foarte practic\u0103.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[29,181,61],"class_list":["post-3621","post","type-post","status-publish","format-standard","hentry","category-gadgets","tag-android","tag-gadgets","tag-gps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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