3results about How to "Reduce indicator requirements" patented technology

The invention relates to a narrow linewidth laser linewidth detection system based on spectrum reconstruction. The narrow linewidth laser linewidth detection system comprises a beam expanding collimation unit, an N-step etalon frequency discrimination unit, a beam splitting focusing unit, N point detectors and a multi-channel acquisition and data processing unit. The beam expanding and collimating unit is used for carrying out light beam collimation on incident measured laser, the N-step etalon frequency discrimination unit comprises N F-P cavities which are spliced into a multi-step etalon with a circular clear aperture, and the F-P cavities are used for respectively gating different spectral ranges of the measured laser and outputting parallel light with different energies. The beam splitting and focusing unit focuses the parallel light output by the N F-P cavities to the light sensing surfaces of the N point detectors respectively, and electric signals are formed through photoelectric conversion. And the multi-channel acquisition and data processing unit obtains a power measured value IM of each point detector, and calculates a power theoretical calculation value IjM of the N point detectors at the same time, thereby obtaining a line width value sigma of the measured single-frequency narrow-line-width laser. According to the invention, the problem that the 3dB bandwidth is difficult to directly read due to insufficient distinguishing capability of the existing frequency discriminator is solved.

The application provides a motion compensation mechanical arm device for unmanned aerial vehicle launching and recovery and a use method thereof, which comprises a multi-section mechanical arm and a six-degree-of-freedom motion compensation mechanism, the bottom end of the multi-section mechanical arm is fixed on a rotary table, the top end is connected with the six-degree-of-freedom motion compensation mechanism, the rotary table realizes 360-degree rotation adjustment, the six-degree-of-freedom motion compensation mechanism is connected with a launching and recovery track, a flight attitude measurement system and a combined navigation system are arranged on the launching and recovery track, the multi-section mechanical arm performs vertical and lateral displacement compensation on the launching and recovery track, and the six-degree-of-freedom motion compensation mechanism reversely compensates the pitching, yawing and rolling angles of a ship, the application has the ship pose motion compensation capability, and further has the track and mechanical arm folding and storage capability, so that the demand for the overall resources of the ship is reduced.

The application provides a method and system for adaptively capturing a Chirp signal, wherein the method comprises: performing amplitude adjustment on received digital baseband data based on output gear information of a DAGC to obtain modified data; calculating an arbitrary correction factor according to preset configuration parameters and the output gear information; generating a local Chirp signal same as a Chirp signal of a sending end, and generating two extended signals based on the local Chirp signal; determining original peak values of the two extended signals respectively according to the modified data and the two extended signals; determining corrected peak values of the two extended signals according to the correction factor, preset configuration parameters and the original peak values; determining a corrected average value of correlation energy of the two extended signals according to the corrected peak values; and determining a signal detection result according to the corrected peak values and the corrected average value, and a preset signal detection criterion. The method and system improve the capture performance and reduce the false alarm rate.