Warning: Table './science/sessions' is marked as crashed and should be repaired query: SELECT u.*, s.* FROM users u INNER JOIN sessions s ON u.uid = s.uid WHERE s.sid = 'spdmkoo9nium2gbbqvuaa66ef1' in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135 Warning: Table './science/watchdog' is marked as crashed and should be repaired query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:12:\"user warning\";s:8:\"%message\";s:173:\"Table './science/sessions' is marked as crashed and should be repaired\nquery: SELECT COUNT(sid) AS count FROM sessions WHERE timestamp >= 1781832816 AND uid = 0\";s:5:\"%file\";s:63:\"/var/www/html/science/science.uni-obuda.hu/includes/session.inc\";s:5:\"%line\";i:120;}', 3, '', 'http://science.uni-obuda.hu/node/1711', '', '216.73.216.140', 1781833716) in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135 Warning: Table './science/watchdog' is marked as crashed and should be repaired query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:12:\"user warning\";s:8:\"%message\";s:184:\"Table './science/sessions' is marked as crashed and should be repaired\nquery: SELECT COUNT(DISTINCT s.uid) FROM sessions s WHERE s.timestamp >= 1781832816 AND s.uid > 0\";s:5:\"%file\";s:67:\"/var/www/html/science/science.uni-obuda.hu/modules/user/user.module\";s:5:\"%line\";i:776;}', 3, '', 'http://science.uni-obuda.hu/node/1711', '', '216.73.216.140', 1781833716) in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135 Warning: Table './science/watchdog' is marked as crashed and should be repaired query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:7:\"warning\";s:8:\"%message\";s:138:\"realpath(): open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/html/science/science.uni-obuda.hu)\";s:5:\"%file\";s:60:\"/var/www/html/science/science.uni-obuda.hu/includes/file.inc\";s:5:\"%line\";i:200;}', 3, '', 'http://science.uni-obuda.hu/node/1711', '', '216.73.216.140', 1781833716) in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135 Warning: Table './science/watchdog' is marked as crashed and should be repaired query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:7:\"warning\";s:8:\"%message\";s:138:\"realpath(): open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/html/science/science.uni-obuda.hu)\";s:5:\"%file\";s:60:\"/var/www/html/science/science.uni-obuda.hu/includes/file.inc\";s:5:\"%line\";i:200;}', 3, '', 'http://science.uni-obuda.hu/node/1711', '', '216.73.216.140', 1781833716) in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135 Navigation of a GPS Based Robot Vehicle | science.uni-obuda.hu
Ugrás a tartalomra

Navigation of a GPS Based Robot Vehicle

CímNavigation of a GPS Based Robot Vehicle
Közlemény típusaConference Proceedings
Kiadás éve2004
SzerzőkMolnár, A., and Z. Vámossy
Konferencia neve13th International Workshop on Robotics in Alpe-Adria-Danube Region (RAAD)
Oldalszám408-413
Konferencia helyszíneBrno, Slovakia
ISBN-szám80-7204-341-2
KulcsszavakGPS, mobile robot, navigation
Összefoglalás

The Global Positioning System is a 24-satellite constellation that can tell the user where he is in the three dimensional world space. GPS navigation and position determination is based on measuring the distance from the user position to the precise locations of the GPS satellites as they orbit. By measuring the distance to four GPS satellites, it is possible to establish three coordinates of a user position (latitude, longitude and altitude) as well as the GPS time.
Since the absence of the purposeful scrambling of the GPS signal, precise measuring can be done with GPS technology in the commercial field. This fact can give new possibilities in outdoor robot vehicle navigation. Several measurements were made in order to locate best field of usage for this technology. The authors made these surveys to pinpoint the precision of the GPS devices. Precision was examined both in dynamic and static context. Static analysis was conducted to define the precision during the measurement of one single point. These measurements were taken on several occasions in 24 hour cycles. The results of these surveys along with researches in this field confirmed that in certain situations GPS can be used for navigating robot vehicles.
A prototype device was constructed which is able to test practical approaches of GPS-based robot navigation. This prototype can be connected to several GPS devices. The outputs of the electronic panel can direct several vehicles (i.e. ships). The resulting robot vehicle can be used to further refine the navigating system.
Warning: Table './science/watchdog' is marked as crashed and should be repaired query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:12:\"user warning\";s:8:\"%message\";s:264:\"Table './science/sessions' is marked as crashed and should be repaired\nquery: UPDATE sessions SET uid = 0, cache = 0, hostname = '216.73.216.140', session = '', timestamp = 1781833716 WHERE sid = 'spdmkoo9nium2gbbqvuaa66ef1'\";s:5:\"%file\";s:63:\"/var/www/html/science/science.uni-obuda.hu/includes/session.inc\";s:5:\"%line\";i:69;}', 3, '', 'http://science.uni-obuda.hu/node/1711', '', '216.73.216.140', 1781833716) in /var/www/html/science/science.uni-obuda.hu/includes/database.mysql.inc on line 135