3Ray J K. Advanced GPS Receiver Technology[J].Canada University of Calgary:Department of Geomatics Engineering,2003.
4Anonymous. Interface Control Document[S].Fountain Valley,CA:Arinc Research Corporation,1991.
5Bo Zheng,Gérard Lachapelle. GPS Software Receiver Enhancements for Indoor Use[A].2005.
6Chansarkar M,Garin L. Acquisition of GPS Signals at Very Low Signal to Noise Ratio[A].Anaheim,CA,2000.731-737.
7Bahl P,Padmanabhan VN. Radar：An in-building RF-based user location and tracking system[A].2000.775-784.
8Kaplan Elliott D,Hegarty Christopher J. Understanding GPS Principles and Applications[M].Artech House Inc,2006.
9KATZ-BASSETY E, JOHN J P, KRISHNAMURTHY A, et al. To- wards IP geolocation using delay and topology measurements[ C]// IMC '06: Proceedings of the 6th ACM SIGCOMM Conference on In- ternet Measurement. New York: ACM Press, 2006:71 -83.
10POESE I, UHLIG S, ALI KAAFAR M, et al. IP geolocation data- bases: unreliable [ J]. Computer Communication Review, 2011, 41 (2) :53 -56.
