FIELD: radio engineering, communication.
SUBSTANCE: wireless device receives a first signal and obtains an identifier indicating a first location from the first signal. The first signal can be received from a cellular base station and the first identifier can be a mobile country code. The wireless device uses the identifier to determine accessibility of signals from a regional satellite system in the first location. If signals from the regional satellite system are accessible in the first location, the wireless device retrieves information associated with one or more artificial satellites in the regional satellite system. The information may include pseudorandom numerical codes and the search range in Doppler mode which corresponds to the first location. The wireless device receives a second signal and processes the second signal to obtain first satellite signal information. The wireless device determines its location at least partly based on first satellite signal information.
EFFECT: improved satellite search efficiency, shorter search time without using additional information such as ephemeral information, almanac or satellite time information.
22 cl, 6 dwg
