GPS/Beidou(BD) Dual-Band Signal Transponder is a GPS/BD signal forwarding system with low cost and high gain, which is specially designed and developed for users of different industries in the weak indoor signal and small coverage area when GPS/BD receivers are produced, tested or used.  It can be quickly locked GPS/BD satellite signal by outdoor donor antenna, linearly amplifies the satellite signal and then retransmits it via the indoor coverage antenna to the weak/blind coverage area.  So that the GPS/BD receivers within the signal coverage can receive the GPS/BD signal, realizing the function of real-time positioning timing signal enhancement.