Dan Bobyn Engineering Ltd.

Dan Bobyn
Engineering Ltd.





About Capabilities Recent Projects Contact Links Home	L1/L2/L5 GPS Signal Generator RF Subsystems This project involved designing a dual channel L1/L5 SBAS signal generator and a L2/L5 variant. The project team included specialists in GPS system and signal design and FPGA and firmware design in addition to the RF contractor. The resulting hardware chassis included a clock reference board, baseband signal and microcontroller boards, RF signal generator boards and power supply. One version of the Signal Generator hardware is currently in use in Europe for GPS SBAS testing after obtaining CE EMC and Safety approval. Another version of this chassis has been commercialized for use in North America. The RF circuits include clock reference board and the L1, L2 and L5 RF boards. The clock reference board generates 10, 75 and 300 MHz synchronous clocks from an internal OCXO or external 10 MHz reference signal. The L1, L2 and L5 RF boards contain: Code Clock Generator DDS Carrier DDS to a resolution of about 1 micro-Hz I/Q Signal Modulator Variable level 70 MHz IF output (for the Satellite uplink) Switchable IF Bandwidth settings L Band output connection (for local feedback and testing) A/D Sampled code clock feedback circuitry Top Back