Fig. 1: CSWPC sensing scheme and physics temperature demodulation principle.
From: 45 km ROTDR with 0.5 m/0.11 °C via complex-domain square-wave width-chirp pulse compression
a CSWPC scheme. b Physics principle of obtaining the δ-pulse Raman scattering trace and the corresponding temperature distribution through complex-domain match-filtering. c Principle of simultaneous enhancement in spatial resolution, sensing distance, and temperature accuracy by the CSWPC scheme. R(T,t) Raman characteristic equations. CEED complex-domain envelope extraction denoising
