(19)

(11)

EP 2 638 405 A2

(12)

(88) Date of publication A3: 05.07.2012 (43) Date of publication: 18.09.2013 Bulletin 2013/38 (21) Application number: 11840035.7 (22) Date of filing: 14.11.2011

(51) International Patent Classification (IPC):  G01R 5/08(2006.01) (86) International application number: PCT/US2011/060655 (87) International publication number: WO 2012/065184 (18.05.2012 Gazette 2012/20)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 12.11.2010 US 413170 P (71) Applicant: Nextnav, LLC Sunnyvale, CA 94085 (US)

(72) Inventors: WOLF, Tom Sunnyvale, CA 94085 (US) RAGHUPATHY, Arun Sunnyvale, CA 94085 (US) SENDONARIS, Andrew Sunnyvale, CA 94085 (US) MEIYAPPAN, Subramanian Sunnyvale, CA 94085 (US) PATTABIRAMAN, Ganesh Sunnyvale, CA 94085 (US) TANG, Haochen Sunnyvale, CA 94085 (US) VAJJHALA, Prasad Sunnyvale, CA 94085 (US) SINGH, Rajendra Sunnyvale, CA 94085 (US) (74) Representative: Beresford, Keith Denis Lewis et al Beresford & Co 16 High Holborn GB-London WC1V 6BX GB-London WC1V 6BX (GB)