A network aided iterated LS method for GPS positioning and time recovery without navigation message decoding

Author

Akopian, David ; Syrjärinne, Jari

Author_Institution

Res. & Technol. Access, Nokia Mobile Phones, Tampere, Finland

fYear

2002

fDate

2002

Firstpage

77

Lastpage

84

Abstract

The paper suggests a network aided iterated least squares (LS) method for GPS positioning and time recovery when a navigation message from satellite vehicles (SV) is not available. Using an additional variable which defines the satellite positions, the estimates of time of transmissions and pseudoranges are obtained from measurements available from the tracking side of the receiver. LS iterations are modified to account for adjustment of SV positions on orbits, adjustment of pseudoranges, etc. As a result, the positioning is performed without time-of-week (TOW) information from the navigation message.

Keywords

Global Positioning System; distance measurement; iterative methods; least squares approximations; parameter estimation; radio receivers; GPS positioning recovery; GPS time recovery; LS iterations; SV orbit positions; navigation message decoding; network aided iterated LS method; network aided iterated least squares method; positioning; receiver tracking side measurements; satellite position variable; satellite pseudorange estimates; satellite transmission time estimates; satellite vehicle navigation message; time-of-week information; Clocks; Data mining; Extraterrestrial measurements; Global Positioning System; Iterative decoding; Least squares methods; Paper technology; Position measurement; Satellite broadcasting; Satellite navigation systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Position Location and Navigation Symposium, 2002 IEEE

Print_ISBN

0-7803-7251-4

Type

conf

DOI

10.1109/PLANS.2002.998892

Filename

998892