This article explores the design of time-frequency-space transmit systems for Terahertz Integrated Sensing and Communication (THz ISAC). It introduces novel hybrid precoding algorithms for ISAC systems, focusing on ultra-massive MIMO and multi-carrier modulation. The proposed algorithms achieve centi-degree-level angle estimation accuracy and millimeter-level range estimation accuracy, surpassing existing methods in the millimeter-wave band. The article addresses challenges in path loss compensation, beamforming, and sensing beam management for THz ISAC systems. It also discusses parameter estimation algorithms for angle, range, and velocity estimation, along with an ISI- and ICI-tackled sensing algorithm to refine sensing capabilities.
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