20results about "Electromagnetic wave modulation" patented technology

The invention relates to the technical field of frequency conversion, in particular to a radio frequency microwave signal modulation method and system, and the method comprises the following steps: detecting the ratio of the time domain peak interval to the frequency domain main sideband energy of a radio frequency signal, inputting the time domain peak interval and the frequency domain main sideband energy into a cross-correlation algorithm for synchronism analysis, extracting the periodic characteristics of a time domain peak sequence, and obtaining a frequency domain peak sequence; and generating an energy coupling factor based on a difference operation result of the frequency domain energy density gradient value and the time domain peak interval. According to the method, periodic characteristics are analyzed and extracted through the ratio of peak spacing to main sideband energy to generate an energy coupling factor, a main frequency point offset and an energy tilt vector are fused to generate a harmonic tendency parameter, an interference source path is positioned by combining a frequency trajectory vector, and disturbance levels are divided by clustering energy and harmonic parameters. And a conflict direction is pre-judged and stop band parameters are pre-loaded by grey prediction of a main sideband frequency difference value trend, and a closed-loop regulation and control system is constructed to improve the anti-drift capability and reduce the spectrum conflict risk.

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 integrated device (1) comprises: a substrate (10), an electro-optic modulator antenna (11) arranged on the substrate (10) which is configured to receive a radio wave signal (30) and to convert an optical input signal (21) into an optical output signal (22) which depends on the radio wave signal (30), coupling elements (121, 122) arranged on the substrate (10) which are configured to optically couple the electro-optic modulator antenna (11) with fiber cores (41, 42) which are configured to receive the optical input signal (21) respectively to transmit the optical output signal (22).

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 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.

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.

To suppress jitter in a multichannel communication device.SOLUTION: A communication device includes an oscillator, a signal generation circuit, an insulation element, and an output circuit. The oscillator is configured to output a carrier signal when an input signal externally input is at a first logic level. The signal generation circuit includes: a delay circuit; a first logic circuit having a first input end to receive an input signal and a second input end to receive an input signal via the delay circuit; a second logic circuit having a first input end connected to an output end of the first logic circuit and having a second input end to receive a carrier signal; a third logic circuit having a first input end to receive an input signal and a second input end connected to an output end of the second logic circuit; and a driving circuit to amplify a voltage output by the third logic circuit. The insulation element is connected to an output of the driving circuit. The output circuit receives a signal based on the output signal of the driving circuit via the insulation element and outputs the signal to the outside.SELECTED DRAWING: Figure 23

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.

An electronic device, including a substrate and multiple modulation units, is provided. The modulation units are disposed on the substrate. Each modulation unit includes a first electronic element, 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.

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.

The embodiment suppresses jitter of a multi-channel communication device. The communication device includes an oscillator (20), a signal generating circuit (30), an insulating element, a receiving circuit, and an output circuit. The oscillator outputs a carrier signal when at least one of a plurality of signals input from the outside is at a first logic level. The signal generating circuit includes a signal generating unit (31) and a driving circuit (32). If the signal generating unit detects a first logic level of a first signal among the plurality of signals, it generates a pulse signal, and adds a carrier signal immediately after the pulse signal. If the first signal is at a second logic level, no carrier signal is added, and a modulation signal is generated using the pulse signal and the carrier signal. The driving circuit amplifies the modulation signal. The insulating element is connected to the output of the driving circuit. The receiving circuit receives the modulation signal output from the driving circuit via the insulating element and demodulates it. The output circuit outputs the signal demodulated by the receiving circuit to the outside.

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.