Machine shaking laser gyroscope shaking demodulating device and demodulating method based on FPGA

Abstract

The invention provides a trembling laser spinning trembling demodulating device based on the FPGA. The device is composed of FPGA and the Schmitt trigger respectively connected to the FPGA and the PC/104 and the collocation of the FPGA; in the reverse counting and the digital filter compose the data collecting circuit; the laser spinning outputs two beams of the signals of SIN, COS inputs the reverse counting unit for the reverse counting and then delivering to the register; sampling by the 1kHz, delivering the FIR low pass filter; after the filtering, delivering the anti-overlapping filter to process the descending sampling. The invention processes the trembling laser spinning trembling demodulation via the digital filtering method which can makeup the defect of the periodical sampling; delivering the anti-overlapping filter to process the descending sampling; the invention can effectively eliminate the noise caused by the other factors and the random trebling signal of the bias frequency laser spin and saves the precious design time.

Description

(1) Technical field [0001] The invention relates to a control device and a control method of a laser gyroscope, in particular to a jitter demodulation device and a demodulation method of a mechanically shaken laser gyroscope. (2) Background technology [0002] The laser gyroscope is the only non-electromechanical medium-high precision inertial sensitive instrument that has really achieved fruitful practical applications in the field of inertial technology. The laser gyroscope uses the Sagnac effect of the ring light path, that is, in the ring light path of any geometric shape, the phase difference (or optical path difference) of the two beams of light running relatively in the clockwise and counterclockwise directions is the same as that of the ring light path relative to The rotation rate of the inertial space is linear. The practical laser gyroscope mainly adopts the mechanical jitter bias frequency scheme to solve the problem of latch-up effect. [0003] For the two-fre...

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Problems solved by technology

[0004] 1. The sampling period is difficult to be strictly consistent with the actual frequency bias commutation period of the laser gyroscope, resulting in sampling and counting errors;

[0005] 2. In the strapdown inertial navigation system, timing sampling and navigation calculation are required, but the timing sampling period and the actual jitter commutation period of the laser gyroscope cannot be completely synchronized. Even if the recursive difference algorithm is used, there are also counting errors;

[0006] 3. It cannot effectively eliminate the random jitter signal and noise caused by other factors in the jitter-biased laser gyro

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