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We propose and demonstrate a method for calibrating atomic trajectories in alarge-area dual-atom-interferometer gyroscope. The atom trajectories aremonitored by modulating and delaying the Raman transition, and they areprecisely calibrated by controlling the laser orientation and the bias magneticfield. To improve the immunity to the gravity effect and the common phasenoise, the symmetry and the overlapping of two large-area atomic interferenceloops are optimized by calibrating the atomic trajectories and by aligning theRaman-laser orientations. The dual-atom-interferometer gyroscope is applied inthe measurement of the Earth rotation. The sensitivity is $1.2\times10^{-6}$rad/s/$\sqrt{Hz}$, and the long-term stability is $6.2\times10^{-8}$ rad/s $@$$2000$ s.

Calibration of atomic trajectories in a large-area dual-atom-interferometer gyroscope