Ultra-low-ZCPs long-distance OFDR based on compressive sensing technology

Long-distance OFDR sensing system requires high zero-crossing points (ZCPs), which imposes significant demands on data acquisition. This paper proposes an ultra-low-ZCPs OFDR based on Compressed Sensing (CS) technology. A dual external clock method and orthogonal matching pursuit (OMP) algorithm are used to overcome the constraint of ZCPs and sensing distance. Experimental results demonstrate that the proposed scheme achieves a sensing distance of 200 meters with fewer than 1M ZCPs per sampling channel. Compared to other solutions achieving hundred-meter-level sensing distances, the ZCPs are reduced by an order of magnitude.