The invention discloses a ground GPS emitter that includes reference clock, PLC, navigation message circuit, phase locked loop, mixer, amplifier, and transmitting antenna. The reference clock adopts temperature compensation oscillator, and sends base frequency signal to phase locked loop and PLC. The phase locked loop would generate L1 carrier wave sending to mixer. The PLC generates continuously C/A code and navigation message to form combining code and transmitting to mixer. The mixer modulates the combining code on L1 carrier wave in BPSK method to form GPS signal and after being filtered by band-pass filter and amplifying, it would be sent into airspace. The invention is low cost, simple structure and is easy to install. It could be used in engineering monitoring.' |