Compatible railway bridge state monitoring system based on big dipper

The utility model relates to a compatible railway bridge state monitoring system based on a big dipper and belongs to the electronic monitoring technology field. an output end of monitoring point antennas is connected with a CRNSS receiver through an antenna controller, an output end of the CRNSS receiver is connected with a main data processing machine through a wireless network bridge or cable communication mode, the main data processing machine is connected with a roadside early warning radio station through a radio station, radio station communication is employed between the roadside early warning radio station and a train, and the main data processing machine is connected with a station monitoring center through a 3G module. The compatible railway bridge state monitoring system can monitor bridge deformation which exceeds a preset danger grade, and sends bridge deformation information to the station monitoring center through a 3G network before a bridge falls down; the station monitoring center acquires