In Star Trek: Deep Space Nine, what sensor network is designed to detect cloaked ships?

In Star Trek: Deep Space Nine, a tachyon detection grid is designed to detect cloaked ships.

The system uses a network of sensors that monitor tachyon emissions or disturbances associated with cloaking technology. By distributing the sensors across a region of space, Starfleet can search for evidence of a vessel that would otherwise be hidden from ordinary visual and electronic detection.

The grid is especially important during the Dominion War, when cloaked Romulan and Klingon vessels complicate reconnaissance and defense. A cloaking device conceals a ship, but it does not necessarily eliminate every detectable physical or subspace effect. Sensor networks exploit that limitation.

This is different from a cloaking device itself, which hides a vessel. It is also not the same as a tachyon beam used as a weapon or propulsion system. The “grid” describes the coordinated arrangement of detection equipment rather than one handheld instrument.