Digital demodulation system for three-floated gyroscopes

Abstract

The invention discloses a digital demodulation system for three-floated gyroscopes, which comprises an angle sensor, a signal generator, a preamplifier, an A / D conversion circuit, a constant-temperature crystal oscillator, an FPGA field programmable logic device, an RS / 485 interface circuit, and a principal computer. The angle sensor is used for loading a collected signal to be measured on a standard sine excitation signal generated by the signal generator to form a sine wave modulation waveform signal. The preamplifier is used for amplifying the signal. The A / D conversion circuit is used for performing analog-to-digital conversion on the signal to get a digital signal to be measured and a standard digital signal. The FPGA field programmable logic device is used for calculating the digital signal to be measured according to the standard digital signal and outputting the calculation result to the principal computer through the RS / 485 interface circuit. Through the system of the invention, fast and high-precision digital demodulation of a to-be-measured signal collected by the angle sensor is realized.

Description

technical field [0001] The invention belongs to the technical field of inertial measurement, in particular to a digital demodulation system of a three-float gyroscope. Background technique [0002] Ballistic missiles and launch vehicles usually use the inertial coordinate system as the reference coordinate system, and use the gyro-stabilized platform to establish the inertial coordinate system for the missile (arrow). A typical installation method of the gyro-stabilized platform is: before the projectile (arrow) is launched, the outer frame axis of the platform is perpendicular to the shooting surface and coincides with the pitch axis of the projectile, and the inner frame axis and platform axis are respectively aligned with the projectile rolling axis and yaw axis. Axis coincidence. The inertial coordinate system established by the gyroscope on the platform is used to control the platform frame through the stability loop, so that the platform is stable in the inertial spac...

AI Technical Summary

Problems solved by technology

[0004] As the operating frequency increases, the gain and accuracy of the low-pass filter and the analog multiplier will decrease, resulting in severe distortion of the demodulated data

Moreover, the traditional analog lock-in amplifier circuit has shortcomings such as temperature drift and noise, as well as the accuracy problems of the analog device itself, the interference caused by the circuit board production and other factors, all of which have an impact on the accuracy.

For the high-speed and high-precision requirements in the new situation, analog phase-sensitive demodulation can no longer meet the requirements

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