Systems and methods for traffic monitoring based on distributed acoustic sensing

A system for traffic monitoring based on distributed acoustic sensing (DAS), the system comprising:

• a DAS interrogator configured to transmit probing light pulses into an optical fiber deployed along a roadway having a plurality of lanes and to receive backscattered light therefrom using phase-sensitive optical time-domain reflectometry (φ-OTDR) to generate DAS data representative of deformations induced by one or more vehicles on the plurality of lanes;
• and
• one or more processors configured to:
• preprocess the DAS data to generate preprocessed data;
• apply a deep learning network to the preprocessed data to generate a super-spatial-resolution (SSR) representation of the DAS data;
• and
• determine, based on the SSR representation, a specific lane occupied by at least one vehicle among the plurality of lanes by calculating a compression ratio of a width of a vehicle-induced signal in the SSR representation relative to a corresponding width in the preprocessed data, wherein the compression ratio is a function of a horizontal distance from the specific lane to the optical fiber.

A non-transitory computer-readable medium storing instructions that, when executed by one or more processors for traffic monitoring based on distributed acoustic sensing (DAS), cause the one or more processors to:

• receive DAS data from an optical fiber deployed along a roadway having a plurality of lanes, the DAS data being representative of deformations induced by one or more vehicles on the plurality of lanes and obtained from the optical fiber using phase-sensitive optical time-domain reflectometry (φ-OTDR);
• preprocess the DAS data to generate preprocessed data;
• apply a deep learning network to the preprocessed data to generate a super-spatial-resolution (SSR) representation of the DAS data;
• and
• determine, based on the SSR representation, a specific lane occupied by at least one vehicle among the plurality of lanes by calculating a compression ratio of a width of a vehicle-induced signal in the SSR representation relative to a corresponding width in the preprocessed data, wherein the compression ratio is a function of a horizontal distance from the specific lane to the optical fiber.