257 results about "Up conversion" patented technology

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.

The invention discloses a shipborne radar signal source with zero-discontinuity parameter switching capability, which relates to the technical field of shipborne radars and comprises a transmitting end control unit and a radio frequency output unit. The transmitting end control unit is sequentially provided with a parameter management and pre-installation layer, a waveform synthesis layer, a deterministic delay and switching control layer, a time base consistency and channel calibration layer and a recording and diagnosis layer from the top layer to the bottom layer to form complete link output; the radio frequency output unit is provided with a digital-to-analog conversion and intermediate frequency up-conversion link and an external up-conversion and power amplifier link. A double DDS ping-pong and pre-installed preheating switching mechanism, a phase state copying and aligning mechanism, a delay calibration and on-line compensation mechanism and a multi-channel time base consistency and channel calibration mechanism are provided, the problems of interruption, amplitude phase jump, moment jitter, poor multi-channel consistency and the like existing in the parameter switching process of an existing simulation source are solved, and meanwhile the simulation source has the event recording and diagnosing functions. And the reliability and the accuracy of the electric detection equipment on the sea test are ensured.

The invention relates to the technical field of data processing, and discloses an integrated reconnaissance interference method and system based on a transmit-receive cancellation technology, and the method comprises the steps: receiving a mixed signal containing a target radar signal and a leakage interference signal through a receiving channel, and obtaining a first digital signal after down-conversion and analog-to-digital conversion, the leakage interference signal is a signal leaked from the transmitting channel to the receiving channel; acquiring a second digital signal corresponding to an interference signal generated in the transmitting channel, and transmitting the interference signal through an antenna after digital-to-analog conversion and up-conversion; taking the second digital signal as a reference signal, performing adaptive cancellation processing on the first digital signal through an adaptive filter to suppress a leakage interference signal component in the first digital signal, and generating a cancelled signal; wherein in the adaptive cancellation processing process, the digital processing unit adaptively updates the cancellation filtering weight of the adaptive filter according to the reference signal and the cancelled signal.

The invention belongs to the technical field of full-duplex communication, and particularly discloses a high-isolation full-duplex transceiver system and a control method.The system comprises a transmitting module, a receiving module and a full-duplex baseband module, the transmitting module comprises a power amplifier module and a first oscillator, the power amplifier module is connected with the full-duplex baseband module, and the first oscillator is connected with the receiving module; an intermediate frequency signal transmitted by the full duplex baseband module enters the power amplifier module, is mixed with a signal with a frequency f4 generated by the first oscillator, and is up-converted to a frequency f3; the receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is connected with the low-noise amplifier module, a receiving antenna of the receiving module receives the signal and inputs the signal into the low-noise amplifier module for frequency mixing with the signal of the second oscillator, the signal is down-converted to frequency f2, and the signal enters the full-duplex baseband module for data processing. By adopting the technical scheme, based on each module, the influence of self-interference leaked by a transmitting link on a receiving link is completely avoided, and the design complexity of any system is not increased.

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

The invention discloses a high-resolution SAR deception jamming signal rapid generation method and device, and belongs to the technical field of radar countermeasure. The method comprises the following steps: intercepting an SAR signal and measuring parameters of the SAR signal; obtaining a deception jamming template image, and carrying out edge optimization processing; performing two-dimensional partitioning on the template in the distance direction and the azimuth direction to obtain a plurality of sub-templates; calculating a phase compensation function for the central point of each sub-template, and carrying out phase optimization; the optimized sub-templates are superposed, and a high-quality product modulation matrix is generated; and multiplying the matrix by an intercepted SAR signal, and transmitting after digital-to-analog conversion and up-conversion to form a deception jamming signal. According to the method, through block phase compensation and template edge optimization, the imaging quality and concealment of the deception jamming image under the high-resolution SAR are remarkably improved, meanwhile, low calculation complexity is kept, and the method is suitable for satellite-borne and airborne SAR systems.

In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.

The invention discloses a satellite-borne high-integration emission phased-array antenna, which is characterized in that an antenna radiation unit array, a secondary feed network and a power supply and control circuit of a T component array are integrated in a PCB (Printed Circuit Board) sub-array, and a phase shift and attenuation control channel, a power amplifier and a primary feed network are integrated in each T component; a minimum function unit of the phased-array antenna is formed by one PCB sub-array and a T assembly array installed on the PCB sub-array, and a plurality of minimum function units are combined through a radio frequency expansion mother board, so that modular connection and signal distribution are realized, and different emission requirements are met; the minimum function unit, the radio frequency expansion mother board and the thermal control board are longitudinally arranged in a vertical stacking mode, the wave control power supply module, the up-conversion amplification module and the vertical stacking module group are transversely arranged in the same plane, and a heat conduction path is greatly shortened. According to the invention, the longitudinal profile height, the overall size and the system weight of a traditional brick type phased-array antenna are obviously reduced, and the antenna can better meet the application requirements of a low earth orbit flat plate type satellite platform.

The invention discloses a signal reading system and method for superconducting microwave multiplexing device detection, and belongs to the field of superconducting microwave multiplexing device detection, and the system comprises a server which can issue a detection configuration instruction to a signal board, receive and return detection data, operate detection software, execute spectrum analysis and data analysis, and generate a detection result; the signal board is provided with a circuit containing a programmable logic device, and the circuit can output accurate intermediate frequency signals and excitation current signals according to instructions of the server, processes output signals of the detected superconducting microwave multiplexing devices mixed by the frequency mixing board through a critical sampling filter bank algorithm to obtain detection data, and transmits the detection data back to the server; and the frequency mixing plate can perform up-conversion on the intermediate frequency signal generated by the signal plate to radio frequency to form a radio frequency detection signal, output the radio frequency detection signal to each detected superconducting microwave multiplexing device, perform down-conversion on the radio frequency response signal returned from each superconducting microwave multiplexing device to intermediate frequency, and output the radio frequency response signal to the signal plate. The system can detect the quality of the device with low computing resources.

The invention discloses a method for detecting a frequency hopping signal under a low signal-to-noise ratio based on an FPGA (Field Programmable Gate Array), which comprises the following steps of: at a transmitting end, adding a synchronous sequence with low side lobe, high anti-interference performance and self-adaptive adjustment of sequence length under different channel conditions to a frame header and a frame tail of a data frame, and after coding modulation and up-conversion at the transmitting end, carrying out frequency hopping on the frequency hopping signal under the low signal-to-noise ratio; the frequency hopping signals are converted into a group of frequency hopping signals with m hops; and at a receiving end, counting over-threshold frequency hopping signals, jointly judging whether the packet of data is valid data, and dynamically adjusting a correlation peak threshold according to a channel condition. According to the invention, the synchronization accuracy is improved.

The invention discloses a high-speed data transmission high-order modulation compensation power amplifier linear distortion system, and belongs to the technical field of satellite high-speed data transmission. The system comprises a data processing module, a constellation mapping module, a shaping filtering module, a quadrature modulation module, a radio frequency up-conversion module, a power amplifier output module, a weighting parameter calculation module and a mapping correction module. Phase point analysis is carried out on a power amplifier output signal through a frequency spectrograph, constellation points after power amplifier compression are obtained and are compared with standard mapping phase points to generate correction parameters, then a mapping correction module is used for carrying out weighted adjustment on constellation mapping, and peripheral phase point amplitude compression caused by power amplifier saturation is compensated. According to the method, phase point distribution can be corrected through digital preprocessing under the power amplifier saturation working condition, linear distortion of high-order modulation signals is effectively improved, the power amplifier backoff amount is reduced, the power amplifier efficiency is improved, and the method is suitable for a non-amplitude balance high-order modulation scene in a satellite high-speed data transmission system.

The invention relates to a same-time same-frequency full-duplex communication and ranging integrated processing system and method. The system comprises a transmitting chain baseband signal processing module for processing a communication signal and a ranging signal; the radio frequency transmitting channel is used for performing DAC (Digital-to-Analog Converter) and up-conversion processing on a local transmitting signal and then processing the local transmitting signal into a high-frequency transmitting signal to an antenna through a radio frequency transmitting signal; the radio frequency receiving channel is used for performing DAC and down-conversion after the received signal is processed to intermediate frequency, and outputting a digital baseband received signal; the real-time zero value measurement module is used for measuring channel time delay so as to calculate a system zero value; the self-interference suppression module is used for carrying out self-interference suppression on self-interference channel estimation and self-interference signal reconstruction; the receiving link baseband communication signal processing module is used for recovering communication data information; and the receiving link baseband ranging signal processing module is used for outputting ranging service signals. The method has the capability of transmitting and receiving ranging signals and communication signals at the same time and at the same frequency, improves the spectrum utilization rate and reduces ranging errors.

The invention provides an SAR time domain high-fidelity moving target single-base deception jamming method and device, and belongs to the technical field of radar countermeasure, and the method comprises the steps: obtaining a signal parameter of a signal transmitted by an SAR platform, and generating an initial signal of an additional two-dimensional time domain coupled modulation phase; determining the center position of a false target group, designing an interference area position control template, multiplying the interference area position control template with an initial signal, and controlling the position of an interference area; designing a multi-target rapid generation template according to the initial position coordinates of the false moving targets, and multiplying the multi-target rapid generation template with the multiplied signals to generate a plurality of false moving target signals with consistent speed; for false moving targets with different speeds, designing a parallel operation two-dimensional time domain coupled modulation phase and a multi-target rapid generation template in a classified manner, and obtaining a final interference signal; and performing digital-to-analog conversion and up-conversion processing on the final interference signal, and forwarding the final interference signal to a target SAR system pulse by pulse. According to the invention, a single jammer can generate a plurality of high-fidelity false moving targets in different moving states.

The invention discloses a radar communication integrated radiation source simulation system and method. The system comprises an upper computer control unit, a signal processing unit, an up-conversion unit and an antenna unit. An unknown radar or communication signal is analyzed by adopting a signal characteristic analysis method based on phase difference, whether the signal is a complex signal is judged, the waveform of the signal is stored and generated by adopting a DDWS technology aiming at the unknown complex signal, the waveform of the signal is directly generated by adopting a modulation module of a signal processing unit aiming at a conventional signal, and the waveform of the signal is directly generated by adopting a modulation module of a signal processing unit aiming at a known complex signal. The waveform of a fixed part in a signal is synthesized by adopting a DDWS technology, a modulation module of the signal processing unit is used for generating a non-fixed part, and the fixed part and the non-fixed part are combined according to a signal message format time sequence, so that the simulation of a complex signal is realized, and the requirement of current electronic countermeasure training on radar communication integrated radiation source simulation is met.

A lighting apparatus includes a light source, a power module, a controller, a data input module, a serial-to-parallel converter module, an orthogonal frequency division multiplexing (OFDM) modulation module, a radio frequency (RF) upconversion module and an antenna module. The light source including multiple types of LED modules. The controller generates multiple driving currents supplied to the LED modules. The data input module is coupled to the controller. The data input module receives input data to be transmitted. The serial-to-parallel converter module converts the input data into multiple parallel data streams. The orthogonal frequency division multiplexing (OFDM) modulation module modulates the parallel data streams onto multiple orthogonal subcarriers. The antenna module includes multiple antennas configured to transmit RF signals corresponding to the multiple data streams.

A method and system for testing the conversion losses of terahertz mixers capable of eliminating the influence of radio frequency sources includes grouping a mixer to be tested and at least two reference mixers in pairs; in each group, inputting a signal of a preset frequency and a preset power at an intermediate frequency port of a first mixer, and after up-conversion, outputting same to a second mixer to be down-converted, so as to obtain an output power with the frequency same as the preset frequency, and obtain the relationship between a first output power and a first preset power and the losses of two mixers; according to the relationship between the loss of the mixer in each group and the power, obtaining the loss of the mixer to be tested.

The invention discloses a multi-user frequency conversion photoelectric fusion transmission method and system under a high bandwidth, and relates to the technical field of communication, and the method comprises the steps: obtaining a user original data stream, carrying out the encryption and up-conversion of the user original data stream, obtaining encrypted data, and enabling the user original data stream to correspond to the communication content of a user; performing optical fiber channel transmission on the encrypted data, performing demodulation, cyclic prefix removal and down-conversion on the transmitted encrypted data to obtain recovered user original data, and decrypting the recovered user original data to obtain communication content of the user; parallel transmission of data can be realized, and the transmission rate and the transmission capacity of the system are obviously improved.

A 2GHz instantaneous bandwidth radar target echo simulation system, relating to the technical field of radar target echo simulation systems, comprises a radio frequency downconversion module, an analog-to-digital converter, a field programmable gate array, a digital-to-analog converter, and a radio frequency upconversion module. Utilizing a high sampling frequency AD and 16-channel multiphase operation, the FPGA sampling frequency is 375MHz. Combining 16 channels of signals yields a total sampling rate of 6GHz, increasing the instantaneous bandwidth to 2GHz. This system combines high instantaneous bandwidth, high resolution, multiple scattering points, and integration.

This invention belongs to the field of communication and signal processing technology, specifically relating to a GMSK quadrature modulator. It comprises a bidirectional counter, a four-curve data table, an in-phase component processor, and a quadrature component processor, forming a quadrature modulation baseband generator. A binary symbol sequence and a system clock are input to this generator. The system clock is divided to generate a symbol frequency multiplier clock, driving the bidirectional counter to oscillate and count repeatedly. The in-phase and quadrature component processors process and generate curve selection types and curve symbols. The output of the bidirectional counter is used as the curve lookup table address. A quadrature modulation baseband signal is generated by looking up the pre-stored four-curve data table, and then input to a digital up-converter (DUC) circuit to produce a GMSK modulated signal. Compared to existing technologies, this invention is more resource-efficient, has higher accuracy, and lower spurious emissions, making it highly suitable for embedded system or programmable device design and implementation.

The invention relates to the technical field of radar interference high-speed transmission, in particular to an SAR (Synthetic Aperture Radar) interference method based on high-speed data transmission, which comprises the following steps of: receiving a radio-frequency signal transmitted by an interfered SAR, performing down-conversion and analog-to-digital conversion on the radio-frequency signal by a radio-frequency receiving front end to obtain an original sampling data stream, and transmitting the original sampling data stream to a programmable logic part through a high-speed serial interface; the method comprises the following steps: extracting pulse description words including pulse arrival time, pulse width, pulse repetition interval and carrier frequency, reconstructing a coherent interference signal baseband waveform in real time according to the pulse description words, and performing digital up-conversion and digital pre-distortion processing on the baseband waveform to generate a target interference intermediate frequency digital signal; and after digital-to-analog conversion and up-conversion are completed, an interference radio frequency signal is radiated. According to the method, data transmission and signal processing delay can be reduced, interference signal coherence is guaranteed, and intermediate frequency signal generation precision and processing real-time performance are improved.

This invention discloses an integrated navigation transmitter assembly based on digital multi-beam technology, belonging to the field of phased array technology. It includes a lower panel, a transmitter terminal, an up-converter, a power amplifier, a receiver-resistance filter, and a upper panel. This invention adopts an integrated design, combining the transmitter terminal, up-converter, power amplifier, and receiver-resistance filter into a single assembly, resulting in a compact structure and convenient installation and maintenance. It employs a decentralized design, distributing signal generation functions to each transmitter assembly, achieving beam delay, phase, and amplitude control in the digital domain. Compared to traditional analog TR assemblies, this provides higher control precision and more flexible beam pointing. Furthermore, this invention utilizes modular shielding technology, placing digital circuits, analog circuits, and high-power equipment in independent metal shielding cavities, significantly reducing signal leakage and solving the problem of electromagnetic interference between assemblies in large-scale array deployments. This invention has good versatility, allowing adjustment of the transmitted signal waveform and frequency as needed.

The present invention discloses a multi-channel up-down converter with a switch network, which relates to the field of microwave radio frequency circuit technology. The present invention includes a first group of switches to an eighth group of switches, a first down-converter to an eighth down-converter, a first up-converter, and a second up-converter. In the first group of switches to the seventh group of switches, a plurality of single-pole double-throw switches are designed to select a plurality of radio frequency input signals and output them to the first down-converter to the eighth down-converter; in the fifth group of switches and the eighth group of switches, a plurality of single-pole double-throw switches and power dividers are designed to select two channels of radio frequency signals for output. The present invention uses a switch network composed of a plurality of groups of switches to enable the multi-channel up-down converter to support a greater variety and quantity of radio frequency signals without increasing the number of channels, and to flexibly select among different types of signals by switching between different states of each group of switches.

The invention provides a W-band sixteen-channel chip circuit model, and relates to the technical field of radio frequency integrated microsystems. The model comprises an up-conversion frequency mixing circuit, a down-conversion frequency mixing circuit and sixteen channel circuits connected in parallel, and each channel circuit comprises two branch circuits connected in parallel. Wherein one branch is sequentially connected in series with a low-noise amplification circuit, a first six-bit numerical control phase shift circuit, a first driving amplification circuit, a five-bit numerical control attenuation circuit and a second driving amplification circuit, and the other branch is sequentially connected in series with a first power amplification circuit, a second six-bit numerical control phase shift circuit and a second power amplification circuit. The sixteen channel circuits are all connected to an input port of the radio frequency switch circuit S. The up-conversion frequency mixing circuit and the down-conversion frequency mixing circuit are respectively connected with two output ends of the radio frequency switch circuit S. According to the method, the design speed of a complex circuit or system can be increased, and a priori condition is provided for research of a large-scale complex network.

This invention discloses a device for simulating the Doppler nonlinear effect in low-Earth orbit (LEO) satellite communication, comprising: a user interaction unit for reconstructing the three-dimensional propagation environment between the LEO satellite and the ground terminal based on set communication scenario parameters and calculating the Doppler nonlinear factor; a baseband Doppler nonlinear simulation unit for performing non-uniform resampling of the digital baseband signal based on the Doppler nonlinear factor to obtain a time-domain scaled signal; a carrier Doppler compensation unit for compensating the time-domain scaled signal based on the Doppler nonlinear factor and the carrier frequency to obtain a compensation signal with applied Doppler nonlinear effect; a digital-to-analog converter unit for converting the compensation signal with applied Doppler nonlinear effect into a baseband analog signal with applied Doppler nonlinear effect; and an up-conversion converter unit for up-converting the baseband analog signal with applied Doppler nonlinear effect to a radio frequency (RF) frequency to obtain an LEO satellite RF signal with applied Doppler nonlinear effect.

This disclosure provides a signal processing method and system for continuous-variable quantum key distribution, relating to the field of communication technology. The method includes: up-converting two double-sideband quadrature phase-shift keying (PSK) signals to a first center frequency and a second center frequency, respectively, to form a first quantum signal in the X-polarization direction and a first quantum signal in the Y-polarization direction; adding a first pilot signal in the X-polarization direction to the first quantum signal in the X-polarization direction to obtain a first optical signal in the X-polarization direction; adding a first pilot signal in the Y-polarization direction to the first quantum signal in the Y-polarization direction to obtain a first optical signal in the Y-polarization direction; using a polarization coupler to combine the first optical signal in the X-polarization direction and the first optical signal in the Y-polarization direction into a polarization multiplexed signal; and transmitting the polarization multiplexed signal to a receiver through a quantum channel. According to embodiments of this disclosure, the security key rate of continuous-variable quantum key distribution can be improved.

The application discloses a high-density multi-channel Ku-band radio frequency channel integrated micro module, and belongs to the technical field of radio frequency micro systems. The micro module adopts a three-dimensional stacking architecture, and comprises a four-channel transceiving front end IP, a transceiving frequency conversion IP, a local oscillator source IP and a high-density integrated PCB substrate, and the three IPs are silicon-based packages; a received input signal enters the four-channel transceiving front end IP, is subjected to amplitude and phase control, is transmitted to the transceiving frequency conversion IP through the high-density integrated PCB substrate, is subjected to radio frequency frequency gating filtering, is mixed and frequency-converted to an intermediate frequency output. A transmitted input signal enters the transceiving frequency conversion IP, is subjected to frequency mixing and up-conversion, is subjected to radio frequency frequency gating filtering, is transmitted to the four-channel transceiving front end IP through the high-density integrated PCB substrate, is subjected to amplitude and phase control, and is amplified and output through a power amplifier chip. The application adopts a chip preset grounding ring, a silicon substrate independent cavity and an IP shielding cavity, and solves the complex electromagnetic compatibility problem during communication.

The application provides a signal predistortion processing method and device, electronic equipment and storage medium, and relates to the technical field of communication. The method comprises the following steps: firstly, calculating predistortion complex array by a memory polynomial model based on historical baseband data and historical baseband feedback data; then, applying the predistortion complex array to a baseband signal to generate an in-phase component signal and a quadrature component signal containing amplitude and phase predistortion information; then, respectively performing carrier modulation on the in-phase component signal and the quadrature component signal to obtain an in-phase branch signal and a quadrature branch signal; then, calculating a predistortion real signal based on the in-phase branch signal and the quadrature branch signal; and finally, performing carrier modulation on the predistortion real signal to obtain an up-converted signal. The technical scheme provided by the application solves the technical problem that phase predistortion information cannot be preserved in the signal predistortion process.

The invention discloses an anti-interference radio frequency transceiving assembly which comprises a plurality of B1 low-noise amplification units, a B1 array antenna, a plurality of B3 low-noise amplification units, a B3 down-converter, a BDS B1 / GPS L1 down-converter, a first frequency synthesizer, a second frequency synthesizer, a crosslinking equipment digital signal processing board, a BDS B1 / GPS L1 up-converter, a B3 up-converter, a B2B low-noise amplifier unit and an S low-noise amplification unit. And the first triplexer is in data connection with the L power amplifier unit, the B2B, S and L three-in-one antenna array, the first directional coupler and the first logarithmic detector. According to the invention, electromagnetic wave signals of multiple paths of B3 and multiple paths of BDS B1 / GPS L1 are converted into electric signals, and the signals are filtered and amplified, so that amplitude-phase consistency is satisfied. And performing up-conversion on the analog intermediate frequency signal processed by the cross-linked digital signal processing board to output BDS B3 and BDS B1 / GPS L1 radio frequency signals. And the short message integrated service digital network can be realized.

The application provides a time modulation array antenna adaptive beam updating method, which comprises the following steps: obtaining distance and azimuth estimation values of a sensing object in a previous beam forming period, solving a power distribution vector according to the estimation values, and implementing amplitude weighting on multiple baseband signals; distributing the weighted signals to each harmonic channel through harmonic mapping, combining the signals through digital up-conversion to obtain a single radio frequency signal, and equally distributing the single radio frequency signal to multiple radio frequency branches; generating a 2-bit phase modulation time sequence in combination with the azimuth estimation values, controlling a phase modulator to switch discrete phase states, making the signals converge to a center frequency, and radiating a harmonic beam pointing to the sensing object; simultaneously constructing an equivalent channel, updating a baseband precoding matrix to meet a zero-forcing condition; processing echo signals through two-dimensional matched filtering to obtain target position estimation values in a current period, iteratively updating a power distribution vector, a precoding matrix and a phase modulation time sequence in a next period, and realizing adaptive beam updating.