An analysis of L1-C/A cross correlation and acquisition effort in weak signal environments Qaisar, Sana en_US Dempster, Andrew en_US 2021-11-25T15:19:53Z 2021-11-25T15:19:53Z 2007 en_US
dc.description.abstract Modern mobile devices are now equipped with GPS-receivers to provide E911 and other location based services. Working indoors, the GPS receiver is likely to experience a situation where some of the received signals are stronger than others. These strong signals can prevent the acquisition of a desired weak signal or lead to false acquisition, due to high cross correlation between the strong and weak signals. The C/A Gold code used in GPS L1 signal has an inherent correlation protection of about 24 dB. This becomes inadequate for weak signal acquisition in the presence of multiple strong signals. Various cross correlation mitigation techniques are used to deal with this problem. The impact of cross correlation on weak signal acquisition largely depends on the relative power level and carrier offset of the desired weak signal with reference to the strong interfering signals. This paper first presents an analysis of the L1-C/A cross correlation in the presence of multiple strong signals under different conditions of relative Doppler offset and dwell time. Acquisition of weak signals with different SNR levels is then performed under these conditions, using the ¿Tong¿ search algorithm and the results of acquisition are presented. The results indicate that, for certain relative Doppler offsets, extended dwell times assist in combating the cross correlation noise hence improving the detection probability. en_US
dc.language English
dc.language.iso EN en_US
dc.publisher IGNSS Society en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.subject.other cross correlation en_US
dc.subject.other acquisition en_US
dc.subject.other probability en_US
dc.subject.other interferer en_US
dc.subject.other dwell time en_US
dc.subject.other relative Doppler offset en_US
dc.title An analysis of L1-C/A cross correlation and acquisition effort in weak signal environments en_US
dc.type Conference Paper en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.identifier.doi Sydney en_US
unsw.relation.faculty Engineering
unsw.relation.ispartofconferenceLocation Sydney, Australia en_US
unsw.relation.ispartofconferenceName IGNSS2007 en_US
unsw.relation.ispartofconferenceProceedingsTitle Proceedings of IGNSS2007 en_US
unsw.relation.ispartofconferenceYear 2007 en_US
unsw.relation.originalPublicationAffiliation Qaisar, Sana, Surveying & Spatial Information Systems, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Dempster, Andrew, Surveying & Spatial Information Systems, Faculty of Engineering, UNSW en_US School of Civil and Environmental Engineering *
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