2results about How to "Improve demodulation efficiency" patented technology

The present specification relates to the technical field of fiber-optic gyroscopes, and discloses a reciprocal structure 3x3 fiber-optic gyroscope and a use method thereof, to solve the problems of poor anti-interference, complex calculation, and no consideration of the influence of temperature change on test results, poor environmental adaptability, and limited practicality of a typical non-reciprocal structure 3x3 fiber-optic gyroscope; three photoelectric detectors, a 2x2 coupler, a 3x3 coupler, a temperature sensor, and a signal processing module; the 2x2 coupler, the 3x3 coupler, the first photoelectric detector D1, the second photoelectric detector D2, and the third photoelectric detector D3 constitute a reciprocal structure 3x3 fiber-optic gyroscope optical path. The reciprocal structure 3x3 fiber-optic gyroscope extracts a reciprocal end output signal, uses the reciprocal end output signal as a reference quantity for differential demodulation, eliminates the influence of optical path loss variation and light source fluctuation on the gyroscope output signal, and greatly improves the anti-interference of the gyroscope system.

The application discloses a data demodulation method of a transponder, and mainly solves the problem of low demodulation efficiency caused by the need of establishing symbol synchronization and tracking for implementing the demodulation of phase modulation data based on Hilbert transform. The implementation scheme is as follows: dividing the radar signal received by the transponder into two paths, performing Hilbert transform on one path to generate quadrature signals, and performing delay alignment phase on the other path to generate in-phase signals; performing the operation of the sine-cosine double-angle formula and the half-frequency processing on the quadrature signals and the in-phase signals to obtain the sine wave and the cosine wave of the carrier phase; substituting the quadrature signals, the in-phase signals, the sine wave of the carrier phase and the cosine wave of the carrier phase into the cosine two-angle difference formula to perform the operation and eliminate the carrier phase to obtain the demodulation data. The application does not need symbol synchronization for implementing the demodulation of phase modulation data based on Hilbert transform, and the establishment of symbol synchronization and the tracking of symbol synchronization are avoided, thereby saving the circuit, improving the demodulation efficiency and being applicable to the data communication of the transponder.