6results about How to "Reduce phase error" patented technology

The invention relates to the field of atomic interference measurement, in particular to an atomic Raman interferometer based on a flat-topped beam. Comprising two Raman interference subsystems arranged in parallel, each of the two Raman interference subsystems comprises an ultrahigh vacuum cavity and a light path system, and the light path system comprises a flat-topped beam shaping module located on one side of the high vacuum cavity and a Raman light Doppler sensitive configuration module located on the other side of the high vacuum cavity; in the flat-topped beam shaping module, the holographic algorithm principle is adopted, the actual size of atoms in an interference area is combined to determine the size of a target flat-topped beam, the initial complex amplitude is precisely constrained, and a final diffraction phase is obtained through iterative optimization. After the Raman light passes through the diffraction phase, the Raman light is shaped into a flat-topped light beam with a target size and uniform intensity distribution at the ultrahigh vacuum cavity, so that the coherence efficiency under the same interference time is remarkably improved.

The invention discloses a D wave band frequency expansion device system for a channel simulator and a calibration method, the D wave band frequency expansion device system comprises a low-frequency channel simulator, a local oscillator distributor, a D wave band transmitting link, a D wave band receiving link and a D wave band waveguide bi-directional coupler, and the system supports terahertz frequency band spread spectrum and calibration functions of the low-frequency channel simulator. A local oscillator distributor is adopted to ensure phase synchronization of an uplink and a downlink, and receiving and transmitting isolation of the same physical channel is realized through a waveguide bi-directional coupler, so that uplink and downlink full duplex testing of communication equipment is realized. Calibration of the whole system is completed by the low-frequency channel simulator and the frequency expansion device together, and compensation of nonlinearity, amplitude-frequency and local oscillation leakage of D-band signals can be achieved by adopting the calibration method. Compared with the prior art, the device can realize accurate simulation of a D-band full-band channel and full-duplex transceiving performance verification, and provides more reliable technical support for test and verification of high-band wireless communication.

This invention belongs to the technical field of angle detection devices, specifically relating to a high-sensitivity angle detection device based on the tunneling magnetoresistive effect. It includes an upper substrate and a lower substrate, with the upper substrate positioned above the lower substrate and parallel to it, without contact between them. The upper substrate includes a fixed substrate, a square cutout, magnetoresistive power supply wires, a tunneling magnetoresistive element, a magnetoresistive signal transmission line, and a glass substrate. The fixed substrate is positioned above the lower substrate, with a square cutout at its center. This invention utilizes the tunneling magnetoresistive effect for detection, easily achieving full-circle detection by the angle sensor. Furthermore, the phase-shifting circuit combined with the subdivision circuit in the signal processing module improves the measurement resolution, providing a framework for achieving high-precision full-circle angle measurement using other magnetic angle sensors.

The present application relates to servo motor production test technical field, especially relates to a kind of encoder detection method, device and storage medium, the method comprises: establishing the design requirement parameter library stored according to motor model;Connecting motor to be detected and calling corresponding preset design index;Control motor low-speed no-load rotation;Based on the same hardware timer, encoder A / B / Z signal and hall U / V / W signal are synchronously collected, and synchronous timing data is generated;Synchronous timing data is judged effectively;Actual encoder line number, actual electrical phase and actual hall phase are calculated;Actual parameter is compared with preset design index item by item, all satisfy when judging qualified, any item does not satisfy when judging unqualified and recording deviation.The present application can improve servo motor encoder detection efficiency and phase determination accuracy, adapt to multi-model mixed-line production, and realize detection process traceability.

The application discloses a kind of optical fiber gyro inertial platform angular vibration transmission characteristic test methods, including synchronous acquisition position angular vibration table excitation angle signal and the frame angle signal of optical fiber gyro inertial platform;According to the frame angle signal of optical fiber gyro inertial platform, the method for obtaining optical fiber gyro inertial platform attitude angle signal is adopted navigation solution, and it is relevantly operated, and relevant characteristic function is obtained;According to the relevant characteristic function, the amplitude-phase characteristic solution of stable loop is carried out, and the amplitude of stable loop and the phase of stable loop in optical fiber gyro inertial platform are obtained;The application also discloses a kind of optical fiber gyro inertial platform angular vibration transmission characteristic test system, including position angular vibration table, optical fiber gyro inertial platform, optical fiber platform ground test system, position angular vibration table control cabinet and electric control box.The application can be applied to the transmission characteristic evaluation of optical fiber gyro inertial platform angular vibration, with higher accuracy and flexibility.

This application provides a broadband filtering 180° phase shifter, chip, and device based on magnetically coupled path switching, including an RF input terminal, a magnetically coupled path switchable network, a matching network, and an RF output terminal. The magnetically coupled path switchable network includes a first inductor, second and third inductors forming positive and negative magnetic couplings with it respectively, and first and second transistors connected to the second and third inductors respectively. The matching network includes first and second series matching units and a parallel matching unit. By alternately controlling the transistors to be on and off, the phase shifter exhibits a consistent third-order bandpass response in both the reference state and the phase-shifted state: the first capacitor and the first inductor at the input terminal are connected in parallel to form a first resonator; the off transistor and the connected inductor form a second resonator; the on transistor grounds the corresponding series matching unit, forming a third resonator with the parallel matching unit, and another series matching unit provides inter-stage coupling. This application achieves broadband high-amplitude phase consistency, significantly improving phase-shifting accuracy.