Driving device for stable magnetic field modulation of MHD angular velocity sensor

Abstract

The invention discloses a driving device for stable magnetic field modulation of an MHD angular velocity sensor. The driving device comprises a precision oscillator, a gain controllable amplifier, a power amplifier, a solenoid, a detection coil, an AC-DC conversion circuit and a differential integrator; magnetic field modulation can be performed on the sensor through the driving device, and then amodulated signal output by the sensor is demodulated to effectively reduce the interference of the 1 / f noise of the operational amplifier and other noises in a low frequency band, improve the outputsignal-to-noise ratio of the sensor, and to ultimately reduce the angular position of the sensor. The instability problem caused by the vulnerable influence of the external environment on the magneticfield modulation amplitude can be effectively solved, thereby improving the stability of a scale factor of the sensor.

Description

technical field [0001] The invention relates to the technical field of signal modulation and demodulation, in particular to a driving device for stably modulating a magnetic field of an MHD angular velocity sensor, which can be used to drive a solenoid in the MHD angular velocity sensor to generate a stable modulating magnetic field. Background technique [0002] Modern high-precision spacecraft, represented by high-resolution earth observation remote sensing satellites, place extremely high requirements on the accuracy and stability of spacecraft attitude angle control. Due to the influence of the space environment, the spacecraft is prone to produce low-amplitude, wide-band micro-angular vibrations of the space structure, which limit the attitude stability and spatial resolution of the spacecraft. The angular velocity sensor based on the principle of Magnetohydrodynamic (MHD) has the characteristics of low noise, wide frequency band, and long life. It is a new type of sens...

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Problems solved by technology

However, the patent lacks the design and analysis of the drive device for modulating the magnetic field

[0005] When a solenoid is used to generate a modulated magnetic field, the amplitude of the modulated magnetic field will change due to the thermal deformation of the coil of the solenoid, the change of the current flowing into the solenoid with the temperature, and the external stray magnetic interference. The stability of the scale factor of the sensor becomes worse

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