Gyro signal acquisition circuit and signal filtering system for three-axis inertially-stabilized platform

Abstract

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.

Description

technical field [0001] The invention relates to a gyro signal acquisition circuit and a signal filtering system of a three-axis inertial stable platform, belonging to the field of high-resolution aerial earth observation systems, and can be used for gyro signal acquisition and signal filtering of a three-axis inertial stable platform with high stability requirements. It is especially suitable for light and small high-resolution aerial remote sensing three-axis inertial stabilization platform. Background technique [0002] The inertial stabilization platform is a necessary equipment for realizing high-resolution earth observation. It can effectively isolate the disturbance and non-ideal attitude movement of the flight platform, so that the observation load's boresight pointing and heading always maintain inertial space stability. At present, the representative foreign products are PAV30 and PAV80 of Swiss Leica Company, while domestic related research has just started and the...

AI Technical Summary

Problems solved by technology

[0003] The existing three-axis inertial stabilization platform gyro acquisition circuit and signal filtering method do not provide the calibration method and signal filtering method of the gain coefficient and zero bias coefficient of the gyro signal, which cannot eliminate the influence of noise and jitter

In addition, the signal amplifying circuit does not consider the influence of ground potential floating, and the change of ground potential under the influence of circuit noise is directly introduced into the measurement link, resulting in a decrease in the accuracy of useful information measurement; at the same time, the differential operational amplifier does not take into account the common-mode rejection problem, and the coupled noise The signal interface of the signal transmission circuit adopts a single-line transmission method, which is easily interfered by other signals; when the voltage is limited, the upper limit voltage is directly connected to the reference source voltage, and the lower limit voltage is connected to the ground. When the input voltage exceeds the saturation value, the reference source voltage will be raised or lowered and the limiting effect will be lost, and other circuits may be damaged at the same time, resulting in a decrease in reliability.

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