14results about "Electromagnetic wave modulation" patented technology

The present disclosure relates to atomic quantum and photonic apparatuses and methods, for example, atomic radio apparatuses and methods. The disclosure describes various aspects of atomic radio. More specifically, the disclosure describes an atomic radio apparatus and associated hardware. Methods for performing radio communications, sensing, and imaging, are described. The disclosure further describes laser, optical, photonics, atom-photonics, and hybrid micro-integrated subsystems for Rydberg excitation, spectroscopy, and quantum technology.

An electromagnetic wave transmission apparatus of the present invention includes a transmission unit whose voltage-current characteristics have a local maximum value and a local minimum value located on a higher voltage side than the local maximum value and which transmits an electromagnetic wave indicating a modulation signal, an acquisition unit which acquires a digital signal, and a modulation unit which modulates the digital signal into the modulation signal which is a signal using voltage values of three levels or more in an oscillation region which is a voltage region that is equal to or more than a voltage of the local maximum voltage and equal to or less than a voltage of the local minimum voltage. The transmission unit preferably transmits a synchronization signal as at least a part of the modulation signal. In this case, the synchronization signal preferably includes a maximum value and a minimum value among the voltage values of three levels or more, and includes a pattern in which the voltage value transitions from one of the maximum value and the minimum value to the other.

A modulator including an amplitude modulating component for modulating an amplitude of an electromagnetic signal is provided. The amplitude modulating component comprises a first conductor for tunnell

An electronic device is provided. The electronic device includes a substrate and a plurality of modulation units. The plurality of modulation units are disposed on the substrate. Each of the modulation units includes a first electronic element and a second electronic element, a first signal line, a second signal line, and a third signal line. The first signal line provides a first voltage to the first electronic element. The second signal line provides a second voltage to the second electronic element. The third signal line provides a third voltage to the first electronic element and / or the second electronic element. The first voltage is different from the second voltage, and the third voltage is different from the first voltage and / or the second voltage. The electronic device of the embodiments of the present disclosure has modulation units capable of modulating the phase, bandwidth, intensity, or polarization state of electromagnetic waves.

The invention relates to the technical field of magnetic sensor signal processing, in particular to a tunneling magnetoresistance (TMR) signal modulation and demodulation method, device and system and a chip. The system comprises a first TMR element, a second TMR element, a switch assembly and a differential amplifier, the output end of the first TMR element and the output end of the second TMR element are connected to the differential amplifier through the switch assembly, and the first TMR element and the second TMR element are opposite in sensitive direction and adopt Wheatstone bridge structures with the same bridge circuit configuration; the switch assembly receives a clock signal input by the clock circuit, switches the on-off state based on the phase of the clock signal, alternately gates and modulates an output end signal of the first TMR element or the second TMR element based on the on-off state, and inputs the modulated output end signal of the first TMR element or the second TMR element to the differential amplifier in a time-sharing manner; the differential amplifier carries out differential amplification on the modulated output end signal which is input in a time-sharing mode to obtain an amplified modulation signal. Through the scheme that the structure is simple and complex mechanical modulation is not needed, the low-frequency noise of the TMR signal is effectively suppressed.

The present disclosure relates to atomic quantum and photonic devices and methods, such as atomic radio devices and methods. Various aspects of atomic radios are described. More specifically, the present disclosure describes an atomic radio device and associated hardware. Methods for performing radio communication, sensing, and imaging are described. The present disclosure also describes laser, optical, photonic, atomic-photonic, and hybrid micro-integrated subsystems for Rydberg excitation, spectroscopy, and quantum technology.

This invention proposes an LFM signal based on random inter-pulse frequency and intra-pulse phase coding modulation, relating to the field of electromagnetic wave waveform modulation technology. This signal inherits the high resolution of LFM signals, has lower range-Doppler (RD) sidelobes, and eliminates the RD coupling effect, so that the false targets generated by ISRJ only produce a sparse deception effect without spreading or drifting on the RD plane. This invention further designs a corresponding signal processing method, which achieves anti-intermittent sampling and forwarding interference by transmitting the modulated signal RIF-PCLFM, improving waveform detection capability and interference suppression performance, and enhancing interference processing efficiency.

The invention discloses a linear frequency modulation signal frequency modulation slope estimation method based on RANSAC, and belongs to the technical field of radars, and the method comprises the steps: obtaining a linear frequency modulation signal, and calculating a parameter symmetric instantaneous autocorrelation function of the linear frequency modulation signal; selecting peak points at each moment to form a set according to the time-frequency distribution of the parameter symmetric instantaneous autocorrelation function; randomly selecting peak points from the set to form a subset; carrying out straight line fitting on peak points in the subsets, and estimating the slope and intercept of a fitted straight line to calculate a target function value; and returning to the step of randomly selecting the peak points from the set to form the subset until a preset number of iterations is reached, and selecting the slope enabling the target function value to be maximum as the frequency modulation slope estimation value of the linear frequency modulation signal. According to the method, the RANSAC algorithm is introduced in the estimation process to reduce the influence of outliers on parameter estimation, the signal-to-noise ratio threshold is reduced, and the frequency modulation slope estimation problem of the linear frequency modulation signal under the low signal-to-noise ratio condition is solved.

A system and a method for communicating through a plasma sheath formed on a vehicle, include a matching layer disposed on at least a portion of a communication device of the vehicle. The matching layer is configured to generate a resonant frequency in relation to the plasma sheath. A modulator is configured to generate one or more electromagnetic waves that modulate the resonant frequency.

To provide an electromagnetic wave transmitting device and an electromagnetic wave communication system that increase the transmission speed. [Solution] In the electromagnetic wave communication system 10, the electromagnetic wave transmitting device 20 includes a transmitting unit 28 that transmits an electromagnetic wave W indicating a modulated signal, which has a maximum value and a minimum value located on the voltage side higher than the maximum value in its voltage-current characteristics; an acquisition unit 22 that acquires a digital signal; and a modulation unit (conversion unit 24) that modulates the digital signal to the modulated signal using three or more voltage values ​​within an oscillation region which is a voltage region above the maximum value and below the minimum value. The transmitting unit 28 preferably transmits a synchronization signal as at least a part of the modulated signal. In this case, the synchronization signal preferably includes the maximum and minimum values ​​among the three or more voltage values, and includes a pattern that transitions from one of the maximum and minimum values ​​to the other.

An electromagnetic modulation device may include a receiver configured to receive electromagnetic signals, a digital-to-analog converter configured to continuously generate a modulation signal, a mixer coupled to the receiver and the digital-to-analog converter and configured to encode the electromagnetic signals received by the receiver with the modulation signal generated by the digital-to-analog converter upon receipt of the electromagnetic signals by the receiver, and a transmitter coupled to the mixer and configured to transmit the encoded electromagnetic signals generated by the mixer.

A modulator is provided including a phase modulating component for modulating a phase of an electromagnetic signal. The phase modulating component includes a conductor for tunnelling the electromagne

The invention provides an LFM signal based on random inter-pulse frequency and intra-pulse phase coded modulation, and relates to the technical field of electromagnetic wave waveform modulation. The signal inherits the high resolution of an LFM signal and has a lower range-Doppler (RD) sidelobe, and the RD coupling effect is eliminated, so that a false target generated by ISRJ only generates a sparse deception effect and does not expand or drift on an RD plane; the invention further designs a corresponding signal processing method, and by transmitting the modulated signal RIF-PCLFM, the intermittent sampling forwarding interference is resisted, the waveform detection capability and the interference suppression performance are improved, and the interference processing efficiency is improved.