467results about "Multi-frequency-changing modulation transference" patented technology

The invention provides an inductor, an inductor framework and an oscillator frequency modulation circuit. The inductor includes: an input terminal; an output terminal; and an even number of coils consisting of electrical conductors connected between the input and output, wherein the input and output are arranged on opposite sides of the inductor; and one half of the coils in the even number are symmetrically arranged relative to the other half of the coils and are opposite in rotation direction. According to the inductor, the inductor architecture and the oscillator frequency modulation circuit disclosed by the invention, the wiring complexity is reduced, the area utilization rate is improved, and the anti-interference capability can be effectively improved.

The invention relates to the field of signal processing, and provides a signal processing method and system for a reconnaissance unmanned aerial vehicle, and the method comprises the steps: carrying out the signal decomposition of a first intermediate frequency signal obtained through the frequency mixing of an unmanned aerial vehicle signal, so as to obtain a set of signal component intrinsic mode functions; a signal analysis and processing algorithm based on deep learning is adopted to carry out waveform semantic feature extraction on the intrinsic mode function of each signal component, so that a filtered first intermediate frequency signal is automatically generated based on the significant dynamic aggregation representation of the waveform semantic feature of each signal component in a global domain; the method can dynamically adapt to the change of a signal environment and extract more representative features so as to improve the flexibility of signal processing. Compared with a traditional fixed parameter filter, the method can better deal with interference and noise in a complex environment, enables the final signal to be clearer, and improves the signal processing quality and automation level of the reconnaissance unmanned aerial vehicle.

The invention discloses a differential signal synthesis circuit of a double-IQ mixer, which belongs to the technical field of radio frequency microwave testing and comprises two single-ended IQ mixing modules, a 180-degree phase shift module and an in-phase combination module or a power division module. The single-ended IQ frequency mixing module is used for up-converting the single-ended IQ baseband signal to radio frequency or down-converting the radio frequency signal to the single-ended IQ baseband signal; the 180-degree phase shift module is used for converting an input signal into two paths of signals with a phase difference of 180 degrees; and the power division module is used for converting the radio frequency input signal into two paths of signals with the phase difference of 0 degree. According to the invention, the IQ mixer with a differential structure is constructed, so that the microwave band of the IQ mixer is comprehensively improved in the index aspects of local oscillator leakage, even-order component suppression, common-mode interference suppression, signal-to-noise ratio and the like; according to the invention, single-ended IQ mixers with various types and complete frequency bands can be constructed into a differential structure form, and signal indexes in numerous application scenes are improved.

An I / Q signal generating apparatus and phase shift apparatus using the same are provided, the I / Q signal generating apparatus including: a first resonance circuit whose one end is connected to a first input terminal and whose other end is connected to a first output terminal; and a second resonance circuit whose one end is connected to the other end of the first resonance circuit or a second input terminal, and whose other end is connected to a second output terminal, wherein the first resonance circuit and the second resonance circuit each include a resistor, a capacitor connected in parallel with the resistor, and an inductor connected in a form of a cross between the resistor and the capacitor.

The invention discloses a radio frequency signal matching network, a frequency mixer, a phase shifter, a radar sensor and electronic equipment, the radio frequency signal matching network comprises a first inductor with an I-path input end, a second inductor with a Q-path input end, and a third inductor which is inductively coupled with the first inductor and the second inductor, and the third inductor is provided with an output end; wherein the I-path input end is set to receive I-path radio frequency signals, and the Q-path input end is set to receive Q-path radio frequency signals.

The invention relates to the technical field of radio frequency, in particular to a radio frequency conversion assembly, and the assembly comprises a baseband processing unit which employs a millimeter wave SoC chip and is used for generating and processing an initial transmitting signal of 79-81GHz and an initial receiving signal of 79-81GHz; the frequency conversion unit comprises an up-conversion subunit and a down-conversion subunit, and the local oscillation synthesis unit is used for generating and providing a local oscillation signal with a fixed frequency; the mode switching and processing system is used for selectively performing down-conversion processing on the echo signal or a target radio frequency signal from an external non-cooperative irradiation source in two working modes and then transmitting the echo signal or the target radio frequency signal to the baseband processing unit; the working mode comprises an active mode and a passive mode.

An array antenna device for use in a 300 GHz band includes a first layer in which antenna elements are arranged in a grid shape and a second layer stacked on the first layer. The second layer includes mixers that are arranged in grid regions overlapping the antenna elements in plan view, that each include an LO signal terminal, an IF signal terminal, and an RF signal terminal, with the RF signal terminals being electrically connected to the antenna elements. The second layer also includes LO signal lines provided to respective columns of the mixers. Each LO signal line is commonly connected to the LO signal terminal of the mixers of the same column. The second layer further includes IF signal lines provided to respective rows of the mixers. Each IF signal line is commonly connected to the IF signal terminal of the mixer of the same row.

The invention provides an orthogonal down-conversion mixer, which comprises a first signal input port, a signal processing module and a mixing module, and is characterized in that a radio frequency signal is converted into a differential radio frequency signal through the first signal input port, and phase shift, amplification and impedance matching are performed on an initial local oscillator signal through the signal processing module; a first local oscillator signal and a second local oscillator signal are used for receiving a differential radio frequency signal, two local oscillator signals with orthogonal phases are obtained, the differential radio frequency signal is amplified through a pseudo-differential structure in a frequency mixing module, and frequency mixing is performed on the first local oscillator signal, the second local oscillator signal and the amplified differential radio frequency signal to obtain two target intermediate frequency signals. According to the orthogonal down-conversion mixer provided by the invention, the differential radio frequency signal is amplified through the pseudo-differential structure, the noise coefficient and power consumption of the mixer are reduced, the mixing speed is increased through the two local oscillator signals, and the noise coefficient of the mixer is further reduced.

The invention provides a novel broadband simulation multiple correlation type microwave radiometer, and relates to the technical field of passive remote sensing detection. The system comprises a double-path correlation radio frequency front-end unit, an intermediate-frequency filtering and amplifying unit and an analog multiple correlation unit, wherein the analog multiple correlation unit comprises two analog multiple correlation channels, each analog multiple correlation channel comprises a broadband multiplication unit and an active differential filtering unit, and the broadband multiplication units are used for carrying out differential conversion on input same signals and orthogonal signals and carrying out correlation operation; and performing active differential filtering processing on the signal after the correlation operation through an active differential filtering unit, and outputting two paths of orthogonal differential parameters. The analog multiple correlation unit designed by the invention adopts a full-link differential design, including differential passive / active filtering, amplification and transmission, the design can provide amplitude twice as large as that of a single-ended signal and better linearity under the same power supply voltage, and meanwhile, the problems of direct-current drift and common-mode interference suppression are solved.

An SIP module integrated direct wave amplifier comprises a power supply control module, an X-band down-conversion module and an L-band down-conversion module, the power supply control module provides attenuation control signals and a low-ripple power supply for the X-band down-conversion module and the L-band down-conversion module, the X-band down-conversion module performs primary frequency conversion on externally received radio frequency signals, and the L-band down-conversion module performs secondary frequency conversion on the externally received radio frequency signals. The L-band down-conversion module performs secondary frequency conversion on the radio frequency signal subjected to primary frequency conversion by the X-band down-conversion module, the two down-conversion modules are arranged to realize structure modularization and standardization by adopting a SiP modularization mode, and each module is independent in function, so that the structure is simple, the cost is low, and the cost is low. Meanwhile, the serial-parallel conversion chip control circuit is adopted to control the numerical control attenuator to meet the requirements for high gain and large dynamic range of the direct wave amplifier, the architecture and the number of control circuits are simplified, and the circuit is easy to build, easy to use, convenient to integrate and high in selection flexibility.

A phased-array transmitter system includes a plurality of signal paths and a power amplifier. Each of the signal paths comprises: a phase-shifter configured to generate a phase-shifted signal; a first mixer configured to mix the phase-shifted signal with a baseband signal to generate a first mixed signal; a variable gain amplifier (VGA) configured to perform phase-invariant gain-controlled amplification on the first mixed signal; a second mixer configured to mix the amplified first mixed signal with a radiofrequency local oscillator (RFLO) signal to generate a radiofrequency (RF) signal; and a power amplifier configured to amplify the RF signal and feed the amplified RF signal to an antenna.

The invention discloses a highly integrated V-band broadband multichannel multimode detector front-end chip, which belongs to the field of millimeter wave integrated circuits and comprises a phase-locked loop module PLL, a radio frequency local oscillator chain module LO, a dual-transmitting channel module TX, a dual-receiving channel module RX, a pulse time sequence control module and an SPI configuration interface module. According to the invention, the problems of difficulty in broadband signal generation, serious multi-channel phase mismatch, complexity and low efficiency of a multi-mode system and difficulty in consideration of transmission link speed and power consumption in the existing V-band detector chip are solved.

The invention belongs to the technical field of airborne equipment, and provides a general frequency conversion VPX module, which comprises a local oscillator source, a transmitting frequency conversion channel and a receiving frequency conversion channel, and is characterized in that the local oscillator source is used for generating a fixed dot frequency local oscillator LO3, a frequency hopping source local oscillator signal LO2 and a frequency hopping source local oscillator signal LO1; the transmitting frequency conversion channel is used for combining transmitting intermediate-frequency inputs with different bandwidths and signals generated by the local oscillator source, and performing up-conversion to generate radio-frequency signals for output; and the receiving frequency conversion channel is used for combining the radio frequency signal with the signal generated by the local oscillator source, performing down-conversion to generate an intermediate frequency signal, and outputting the intermediate frequency signal according to a corresponding bandwidth. Based on the general frequency conversion VPX module provided by the invention, adaptive function adjustment can be carried out according to different requirements of the avionics system, so that the frequency conversion module resources can realize the effects of resource standardization, universalization, reconfigurability and low comprehensive cost in the next generation of airborne avionics system.

The invention provides an ultra-wideband down-conversion method without preselection filtering, which adopts a secondary frequency conversion scheme, does not need preselection filtering of an input radio frequency signal, after the radio frequency signal is filtered by a low-pass filter, the radio frequency signal is up-converted to an intermediate frequency, and then the radio frequency signal is filtered by an intermediate frequency filter and then down-converted to obtain an intermediate frequency signal. When up-conversion is carried out for the first time, a passive mixer with the third-order cross modulation (LO-2IF) suppression larger than 60 dBc is used, meanwhile, through passive frequency multiplication and segmented filtering of a local oscillator fundamental wave signal, strict control over the harmonic component of a local oscillator signal entering the first mixer is achieved, and therefore the harmonic component of the local oscillator signal entering the second mixer is strictly controlled. An intermediate-frequency signal is filtered through a different intermediate-frequency filter on an intermediate-frequency link, and the frequency conversion assembly achieved through the method still has the false suppression level larger than 45 dBc under the condition that pre-selection filtering is not needed. According to the invention, the complexity, cost, volume and weight of the system can be reduced, and the system has excellent telecommunication performance.

The invention relates to the technical field of wireless communication and signal processing, in particular to a short-wave spectrum efficient sampling method and system based on compressed sensing, and the method comprises the steps: collecting full-band power spectrum density data through a low-speed scanning receiver; determining a strong interference frequency point set; generating a binary null observation sequence; loading the binary null observation sequence to an analog front-end frequency mixing circuit, performing analog domain orthogonal frequency mixing and integral processing on the input radio frequency signal, and outputting a voltage sampling value; resolving to obtain a signal sparse coefficient through a compressed sensing reconstruction algorithm; calculating a reconstruction residual error according to the voltage sampling value and the signal sparse coefficient; in response to the condition that the reconstruction residual error is greater than a preset error threshold, triggering a reacquisition process of the power spectral density data; outputting a signal sparse coefficient in response to the condition that the reconstruction residual error is smaller than or equal to a preset error threshold; according to the invention, the problems of limited dynamic range and weak signal submerging are solved, and the receiving sensitivity of weak signals in a strong interference environment is obviously improved.

A measurement system includes a narrowband receiver configured to receive an input signal with an initial bandwidth. The narrowband receiver includes at least one local oscillator configured to provide a local oscillator signal having a center frequency and at least one signal mixer configured to mix the input signal and the local oscillator signal to obtain a mixed signal including image portions. The mixed signal has a respective center frequency in view of the local oscillator signal mixed therein. The narrowband receiver is configured to process two or more mixed signals, thereby obtaining two or more captured signals for different center frequencies of the local oscillator signal. The two or more captured signals have a limited bandwidth compared to the initial bandwidth. The narrowband receiver is configured to combine the two or more captured signals in order to obtain a processed signal without image portions.

An electronic device may include an antenna, a receiver, and a transmission line path that couples the antenna to the receiver. A peak detector may receive a radio-frequency signal from the transmission line path and may output a DC voltage indicative of a peak voltage level of the signal. The peak detector may include a pair of square law transistors having source-drain terminals coupled to an output of the peak detector. The peak detector may include a differential pair of transistors coupled between a power supply voltage and the output. The peak detector may include diode-connected transistors coupled between the source-drain terminals and gate terminals of the square law transistors. The diode-connected transistors may cause noise current to flow along feedback loop paths from the source-drain terminals onto the gate terminals of the square law transistors. This may remove noise from the output of the peak detector.

The present invention discloses a microwave photon dual orthogonal mirror frequency suppression mixing method, comprising the following steps: S1, using a radio frequency signal and a local oscillator signal to perform carrier suppressed single sideband modulation on a cognate optical carrier, respectively, to obtain a light-carrying radio frequency signal and an optical local oscillator signal, respectively; S2, dividing the light-carrying radio frequency signal and the optical local oscillator signal into two paths, and respectively undergoing a phase shift, and then dividing the two paths of optical local oscillator signals / optical radio frequency signals that have undergone a phase shift into four paths, and respectively undergoing a secondary phase shift, and then coupling them with the light-carrying radio frequency signal / optical local oscillator signal that has undergone a phase shift; S3, selecting four paths of coupled optical signals and converting them into electrical signals respectively; S4, respectively phase shifting the four paths of electrical signals and then coupling them, to obtain an intermediate frequency signal that achieves image frequency suppression. The present invention also discloses a microwave photon dual orthogonal mirror frequency suppression mixing device. Compared with the prior art, the present invention can greatly improve the image frequency suppression ratio.

The invention relates to a broadband active mixer reversible design method and system based on an improved reversible neural network, and the method comprises the steps: obtaining the response of a broadband active mixer, and the response comprises a conversion gain G and a noise index NF; the response is input into the R-INN model, design parameters of the broadband active mixer are output, the active mixer is designed according to the design parameters, the design parameters comprise resistance and capacitance, the R-INN model is constructed through combination of real-value non-volume preserving transformation and a reversible neural network, and the R-INN model is obtained through training of a training set. The training set comprises design parameters in a preset range and corresponding responses. According to the method, the improved reversible neural network model combined with the real-value non-volume preserving transformation technology is introduced, so that the precision of forward prediction is optimized, and the posterior distribution of the design parameters is effectively reversely deduced, and therefore, the efficiency and accuracy of the optimization design of the broadband active mixer are improved.

This application discloses a signal processing system and a related apparatus, and relates to the field of millimeter-wave radar technologies. The signal processing system includes: a signal generation unit, a frequency mixing and phase shifting unit, and N transmit ports, where the signal generation unit is configured to generate one baseband signal, where the one baseband signal includes a first baseband signal and a second baseband signal, and the first baseband signal and the second baseband signal are quadrature signals; the frequency mixing and phase shifting unit is configured to perform frequency mixing processing and phase shifting processing on the one baseband signal to obtain N radio frequency signals, where phases or frequencies of the N radio frequency signals are different from each other; and the N transmit ports are configured to respectively transmit the N radio frequency signals, where N is a positive integer. The signal processing system can solve problems of poor linearity and long settling time.

The invention discloses a software radio digital signal frequency conversion method and system and a medium. Relates to the technical field of digital signal processing. Comprises: acquiring an input signal; performing complex multiplication on the input signal and the carrier signal to obtain a frequency conversion signal; based on an adjustable filtering extraction module, performing integral multiple or rational multiple filtering extraction on the frequency conversion signal to obtain an output signal; wherein rational multiple filtering extraction is realized by a numerical control oscillator and an interpolation unit; according to the scheme, on the basis of the traditional technology of realizing the digital down converter on the FPGA, the method and the structure are improved, and on the basis of an adjustable filtering extraction module, integral multiple or rational multiple filtering extraction is carried out on a frequency conversion signal to obtain an output signal; free adjustment of the digital down-conversion multiple is achieved, and rational number multiple configuration of digital down-conversion is achieved based on the numerically controlled oscillator and the interpolation unit.

The invention provides an all-digital dual-mixing phase discrimination filtering system and a metastable state median filtering method, and relates to the technical field of signal processing. The system provided by the invention is completely realized by an FPGA (Field Programmable Gate Array), and frequency mixing processing is carried out on a tested clock signal by adopting a multi-stage frequency mixing link, so that the influence of a metastable state on a DDMTD (Digital Division Multiplexing Time Division Multiplexing) frequency mixing result is reduced; in addition, a DDMTD burr filtering module arranged in the multi-path filtering module is used for simultaneously carrying out metastable state filtering on multi-path DDMTD frequency mixing results of the same clock signal, and the edge of each path of DDMTD frequency mixing result is accurately recovered; in addition, DDMTD clock phase difference measurement is carried out on each path of DDMTD frequency mixing result edge after filtering recovery through a clock phase difference measurement module; and finally, the mean value filtering module is used for finishing mean value processing on the multi-channel DDMTD clock phase difference measurement result, so that the measurement precision of the digital double-mixing phase discrimination filtering system is further improved.

The invention discloses a transmitter with an adjustable local oscillator signal phase, which relates to a wireless communication technology and comprises an internal loopback circuit, a transmitting radio frequency front-end circuit and a register or a baseband signal unit, the transmitting radio frequency front-end circuit comprises a transmitting network ANT1, an upper mixer RF2, a second local oscillator phase calibration unit and a first digital-to-analog converter DAC1; the first baseband signal and a reference voltage Vref are simultaneously input into a second analog-to-digital converter ADC2 to output a control word COMPlt; n: 0gt; ; the second local oscillator phase calibration unit comprises an inverter group, a coarse tuning capacitor Cap1 and a fine tuning capacitor Cap2 are sequentially arranged between inverters INVk, and the coarse tuning capacitor Cap1 is provided with a switching signal receiving end Caplt; n: 0gt; a switching signal receiving end Capt; n: 0gt; the receiving module is used for receiving a control word COMPlt; n: 0gt; ; the second digital-to-analog converter DAC2 is used for receiving a preset analog regulation signal ADJ transmitted from the register or the baseband signal unit and converting the preset analog regulation signal ADJ into a control signal Vctrl; and a control signal Vctrl is input into the fine tuning capacitor Cap2. Adjustment in a digital domain is not needed, and resources are saved.

Disclosed in the present invention are a millimeter wave frequency source array based on cascaded phase control, and a wireless energy transmission device. The millimeter wave frequency source array comprises a local oscillator source and a plurality of identical cascaded phase control units, wherein each phase control unit comprises at least four interaction interfaces, which comprise a fundamental wave input interface, a fundamental wave output interface, a millimeter wave output interface and a control interface; the local oscillator source is connected to the fundamental wave input interface of a first-level phase control unit, and the fundamental wave output interface of a previous-level phase control unit is connected to the fundamental wave input interface of a next-level phase control unit; the local oscillator source is used for generating a preset fundamental wave signal; and each phase control unit is used for generating, on the basis of a drive signal that is input from the fundamental wave input interface and a control signal that is input from the control interface, a preset phase-shift millimeter wave signal that is output from the millimeter wave output interface and a preset phase-shift fundamental wave signal that is output from the fundamental wave output interface. The embodiments of the present invention can reduce power consumption and costs, facilitate expansion, and may be widely applied in the field of wireless energy transmission by electronic systems and the technical field of radars.

The embodiment of the invention discloses a noise generation circuit, a noise generation method and recording shielding equipment, which are used for preventing signals from being monitored. According to the embodiment of the invention, a signal source is connected with a signal generation module and a first modulation module; and the signal generation module is used for sending at least one first ultrasonic wave to a receiving end. The first modulation module is connected with the first noise module, and the first modulation module is used for receiving a first noise signal generated by the first noise module and modulating the first noise signal and the frequency signal to obtain a first modulation signal; the first driving module is connected with the first modulation module and the first probe module, and the first driving module is used for generating a first driving signal according to the first modulation signal and sending the first driving signal to the first probe module. The first probe module sends a second ultrasonic wave according to the first driving signal so as to generate a difference frequency signal overlapped with a part of frequency band or all frequency band of the protected audio signal with the first ultrasonic wave.

Circuitry is provided that includes a matching circuit, a first mixer coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer coupled to the matching circuit, a first transmission line path coupled between the matching circuit and an input of the first mixer, and one or more capacitors coupled to the input of the first mixer and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry can further include a second transmission line path coupled between the matching circuit and an input of the second mixer. The transmission line path can include a first transmission line for conveying signals between the matching circuit and the first mixer, a second transmission line for conveying signals between the matching circuit and the first mixer, and a floating transmission line interposed between the first and second transmission lines.

A phased array transmitter system includes a plurality of signal paths and a power amplifier. Each of the signal paths includes: a phase shifter configured to generate a phase shifted signal; a first mixer configured to mix the phase shifted signal with a baseband signal to generate a first mixed signal; a variable gain amplifier (VGA) configured to perform a phase-invariant gain-controlled amplification of the first mixed signal; a second mixer configured to mix the amplified first mixed signal with a radio frequency local oscillator (RFLO) signal to generate a radio frequency (RF) signal; and a power amplifier configured to amplify the RF signal and feed the amplified RF signal to the antenna.

An electronic device may include clocking circuitry with primary and secondary lasers that generate first and second optical local oscillator (LO) signals. A phase-locked loop (PLL) may tune the secondary laser based to phase lock the first and second optical LO signals. A self-injection locking loop path may couple an output of the secondary laser to its input. The self-injection locking loop path may include a first mixer and a second mixer. The first mixer may generate a beat signal using the first and second optical LO signals. The second mixer may generate a self-injection locking signal based on the first optical LO signal and the beat signal. A delay line or optical resonator may iteratively self-inject the self-injection locking signal onto the secondary laser. This may serve to minimize phase noise and jitter of the optical LO signals.

In a first aspect, the disclosure provides an apparatus (412a) for wireless communication, comprising: a first clock loop (420) comprising a first plurality of latches (422, 424) that generate a first plurality of clock signals (I, Q) having a corresponding first plurality of phases (I, Q); and a second clock loop (430) comprising a second plurality of latches (432, 434) generating a second plurality of clock signals (I45, Q45) having a corresponding second plurality of phases, where the first clock loop is configured to be enabled or disabled based on the first enable signal and the second clock loop is configured to be enabled or disabled based on the second enable signal. And wherein the second clock loop is configured to be enabled or disabled based on a second enable signal (en).

The embodiment of the invention relates to jitter compensation calibration. According to one embodiment, a method for calibrating a local oscillator in an amplitude shift keying (ASK) demodulator of a wireless power transmitter is presented. The method includes: receiving a digital signal corresponding to a voltage or a current of a transmitter coil in a wireless power system implemented with frequency jitter; iteratively adjusting a counter value associated with a jitter table of the local oscillator; wherein for each iteration, the method comprises generating an in-phase (I) component and a quadrature (Q) component using a local oscillator, calculating a metric based on the I component and the Q component, and storing a counter value if the calculated metric exceeds a previously stored optimal metric; and configuring the local oscillator with the stored counter value associated with the optimal metric.