Chirp Radar is a type of radar system that uses a continuous transmission of a signal whose frequency changes over time. The term “chirp” refers to the sound produced by a bird, where the frequency increases or decreases rapidly, and in the case of radar, it describes the changing frequency of the transmitted signal. Chirp radar’s continuous waveform and frequency modulation contribute to its versatility and effectiveness in various applications, particularly those requiring simultaneous range and velocity measurements. Its characteristics make it suitable for both short-range and long-range radar systems across different industries.

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DAS over 1,007-km Hybrid Link with 10-Tb/s DP-16QAM Co-propagation using Frequency-Diverse Chirped Pulses

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We report the first distributed acoustic sensing (DAS) experiment with over >1,000 km reach on a hybrid link comprising of a mixture of field and lab fibers with bi-directional inline Raman amplification after each span. We used 20× frequency-diversity chirped-pulses for the probe signal,and recovered the Rayleigh backscatter using a coherent receiver with correlation detection and diversity combining. A measurand resolution of ∼100 pϵ/√ Hz at a gauge length of 20 meters achieved in the offline experiment. We also demonstrate the first real-time FPGA implementation of chirped-pulse DAS without frequency diversity over a range of 210 km.

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