The invention relates to a gyro
signal acquisition circuit and a
signal filtering
system for a three-axis inertially-stabilized platform, which are used for realizing the high-precision acquisition of angular rate information of the three-axis inertially-stabilized platform and providing feedback reference for the high-precision control of the platform. The gyro
signal acquisition circuit comprises a
signal amplification circuit, a signal transmission circuit, a
voltage amplitude limit circuit and an analog-to-digital (A / D) conversion circuit of a DSP (
Digital Signal Processor); and a signal filtering module comprises a static factor calibration part and an online sliding
average filter part. According to the gyro
signal acquisition circuit and the signal filtering
system for the three-axis inertially-stabilized platform, weak gyro
voltage signals are appropriately amplified, filtered and converted into current signals, the current signals are subjected to
voltage amplitude limit and then enter an AD channel of the DSP, the original
analog signal acquisition is carried out, useful information is extracted by the signal filtering module, and thus, the gyro voltage signals are converted into the true value of the angular rate of a framework of the platform.