The invention relates to an RBOTDA sensing system for inhibiting a non-local effect at a high signal-to-noise ratio. The RBOTDA sensing system comprises a laser, a first electro-optical modulator, a first coupler, a polarization controller, a second electro-optical modulator, a second coupler, an optical fiber amplifier and a first grating filter, which are sequentially connected and are then connected with a first optical opening of an optical circulator; the radio frequency port of the first electro-optical modulator is connected with a microwave signal source; a polarization port is connected with one output end of the first coupler through a first bias pressure controller; a radio frequency port of the second electro-optical modulator is connected with the pulse generator; a polarization port is connected with one output end of the second coupler through a second bias pressure controller; a second optical opening of the optical circulator is connected with sensing optical fiber; a third optical opening is connected with a data collecting and processing unit sequentially through a second grating filter and a balanced detector. The system has the advantages that the pumping pulse exhaustion can be effectively compensated; the influence of the non-local effect on a single-end incidence system is inhibited; the system signal-to-noise ratio is improved; the system sensing precision is greatly improved.
Single-end RBOTDA sensing system for inhibiting non-local effect at high signal-to-noise ratio