Android GPS源代码分析
GPS简介
GPS
- 2.046 MHz BW NB GPS (centered on 1575.42 MHz)
- Satellites transmit different codes at the same frequency (CDMA)
Glonass (GLO)
- ~8.3 MHz BW (1597–1606 MHz), 14 channels (-7 to +6)
- Satellites transmit the same code on different frequencies (FDMA)
BeiDou Systems (BDS)
- 4.092 MHz BW (1559.05 – 1563.14 MHz)
- Satellites transmit different codes at the same frequency (CDMA)
Galileo (GAL)
- 4.092 MHz BW (centered on 1575.42 MHz)
- Satellites transmit at the same frequency using Binary Offset Carrier (BOC) modulation (CDMA/BOC)