Abstract
The design consists of STC89C51 MCU, the GPS15-XL receivers, LED display, servo motors, voice timekeeping and other components .And it is the GPS control system for tower clock, with timekeeping, display, automatic error correction functions. The design captures accurate time information from satellites by GPS15XL-W receiver chip, and collects and deals with time information received from SCM. And then it adjusts the clock. The SCM system consists master clock, and drives the secondary clock through giving out pulse to a servo motor. The system can also achieve the automatic error correction after power on, to change inconvenience of the traditional correction, reduce the mechanical errors. And the tower clock accurate up to ±1µs. There is no cumulative error.
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