Ionospheric influence on increment of GPS chord coordinations, using double carrier phase differences

• Published in: Geodesy and cartography (Vilnius) Vol. 33; no. 2
• Main Author: Jonas Skeivalas
• Format: Journal Article
• Language: English
• Published: Vilnius Gediminas Technical University 01.08.2012
• Subjects: carrier differences; GPS; ionosphere attack
• ISSN: 2029-6991; 2029-7009
• DOI: 10.3846/13921541.2007.9636714

Carrier phase double difference usage for elimination of ionospheric influence in processing two carrier frequencies observed by GPS receivers is analysed. Double carrier phase difference expressions are used in processing procedures, when additional parameters are used for ionospheric influence elimination. Ionospheric influence is eliminated by solution of reduced parametric equations of double carrier phase differences at both frequencies by MLS method in every epoch. A system of parametric equations is solved by applying additional conditional equations. For evaluation of solution reliability the covariance matrix formulas have been suggested. Article in Lithuanian Jonosferos įtaka GPS stygų koordinačių prieaugiams, taikant nešlio fazių dvigubuosius skirtumus Santrauka. Analizuojamas nešlio faziu dvigubuju skirtumu taikymas jonosferos itakai eliminuoti, apdorojant dvieju nešlio dažniu GPS imtuvu matavimu rezultatus. Skaičiavimu procedūrose taikomos nešlio faziu dvigubuju skirtumu išraiškos su papildomais parametrais jonosferos itakai eliminuoti. Jonosferos itaka eliminuojama sprendžiant mažiausiuju kvadratu metodu redukuotas kiekvienos epochos nešlio faziu dvigubuju skirtumu parametrines lygtis. Parametriniu lygčiu sistema sprendžiama sudarant papildomas salygines lygtis. Sprendinio rezultatu patikimumui ivertinti siūlomos kovariaciju matricu formules. Reikšminiai žodžiai: GPS, jonosferos įtaka, nešlio fazių dvigubieji skirtumai.