| 摘要 |
A low power RF receiver ( 1 ) has an antenna ( 2 ), a reception and shaping stage ( 3 ) for the radio-frequency signals provided by the antenna, a 12 -channel correlation stage ( 7 ) receiving intermediate signals (IF) shaped by the reception stage ( 3 ), and a microprocessor ( 12 ) connected to the correlation stage for calculating X, Y and Z position, velocity and time data as a function of data provided by the radio-frequency signals, such as GPS signals, transmitted by satellites. Each channel includes a correlator ( 8 ) associated with a controller ( 9 ), which also includes a digital signal processing algorithm to allow all the synchronisation tasks for acquiring and tracking a satellite to be performed autonomously when the channel ( 7 ') is set in operation, and to lock onto the satellite. Buffer registers ( 11 ) are placed at the interface between the correlation stage ( 7 ) and the microprocessor ( 12 ) for the mutual transfer of data. The low power RF receiver may be mounted in the case of a watch and powered by the energy accumulator or battery of the watch. |
