150 results about "Up conversion" patented technology

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 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 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 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.

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 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.

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 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.

The invention relates to a superheterodyne transceiver system, which belongs to the technical field of millimeter wave and wireless radio frequency links, and comprises a transmitter and a receiver, the transmitter comprises a plurality of first chopping modulation modules used for modulating a plurality of paths of baseband signals to different intermediate frequency bands through a first chopping circuit to obtain a plurality of paths of different intermediate frequency signals; the first local oscillator source is used for generating a shared up-conversion local oscillator signal; the plurality of first frequency mixing modules are used for performing frequency mixing processing on the plurality of paths of intermediate frequency signals and the up-conversion local oscillator signals respectively so as to perform up-conversion on the intermediate frequency signals to an E wave band and obtain a plurality of paths of E wave band signals; the transmitting module is used for transmitting multiple paths of E-waveband signals; and the receiver is used for receiving the multiple paths of E-band signals and demodulating a target signal from the multiple paths of E-band signals. According to the invention, the demand on a local oscillator source is reduced, so that the complexity, power consumption and cost of the system are reduced.

The utility model provides a miniaturized unified Ka frequency band up-conversion channel convenient to disassemble, which comprises a packaged structural member, an upper cover plate, and a radio frequency module, a frequency conversion module, an intermediate frequency module and a Ka frequency band filter which are connected in the structural member, and the structural member is provided with a unified area and a filter area. According to the utility model, the broadband harmonic mixing chip, the numerical control attenuator chip and the amplifier chip which can cover all Ka frequency bands are selected, the Ka up-conversion module is divided into a filter area and a unified area, variables caused by all customized up-conversion channels are concentrated in the filter area, and the filters are replaced by being connected with the unified area through the gold wires, so that the replacement efficiency is improved. The model selection of each chip, the design of a printed board, the position of an external interface and the like of a unified region are not influenced; the radio frequency interface, the intermediate frequency interface and the local oscillator interface are SMP interfaces, outlets of the low-frequency connector and the intermediate-frequency SMP connector face downwards, and SMP-KK can be directly used for direct insertion during follow-up assembly and test, so that assembly and test are facilitated.

A transmitter includes a modulator, a compensator, an up-converter, and a feedback path. The modulator generates a modulated signal at an intermediate frequency (fIF) including an in-phase component and a quadrature component. The compensator generates a local oscillator feedthrough (LOFT) and in-phase and quadrature mismatch (IQM) compensated signal at fIF based on the modulated signal and feedback. The up-converter generates a transmit signal at a transmit frequency (fTX) based on the LOFT and IQM compensated signal. The feedback path generates the feedback based on the transmit signal. The feedback path includes a quadrature bandpass analog-to-digital converter (ADC) to measure LOFT and IQM in the transmit signal.

The invention provides a device and method for measuring the real-time analysis bandwidth of a broadband real-time signal analyzer, and the device comprises a broadband signal generation device and a broadband sampling oscilloscope, and the broadband sampling oscilloscope is used for calibrating a broadband multi-sine pulse modulation signal generated by the broadband signal generation device. Measuring the real-time analysis bandwidth of the broadband real-time signal analyzer according to the standard signal; the method comprises the following steps: generating waveform data of a multi-sine pulse signal by using a control machine, uploading the waveform data to a baseband signal generation module to generate a multi-sine pulse modulation signal, converting the multi-sine pulse modulation signal to a measurement frequency band through an up-converter, and calibrating the formed broadband multi-sine pulse modulation signal by using a broadband sampling oscilloscope, and then the real-time analysis bandwidth and in-band frequency response of the broadband real-time signal analyzer are measured. The real-time analysis bandwidth of the measured equipment can be obtained only through one-time measurement, so that the measurement times are reduced, the real-time performance is enhanced, and the measurement result is more reliable.

The invention discloses a high-parallelism data acquisition and playback method, device and system based on an FPGA (Field Programmable Gate Array), and belongs to the field of signal processing, and the method comprises the following steps: S1, data acquisition: accessing an external signal, sequentially completing signal filtering, band-pass sampling and ADC (Analog to Digital Converter) conversion, and then storing; and S2, data playback: sequentially performing first caching, orthogonal down-conversion, low-pass filtering, second caching, interpolation, orthogonal up-conversion and DAC conversion on the acquired data, and outputting the data to related receiving equipment. The system supports high-speed data acquisition, high-throughput signal storage and large-bandwidth signal playback, and has a very high engineering application value.

The application discloses a kind of all-time electronic interference system transceiving methods, comprising the following steps: S1.jammer generates the interference signal with period N , is transmitted after digital-analog conversion and up-conversion operation;S2.scout receiver enters training mode, after the self-interference, reference signal is passed through down-conversion, analog-digital conversion operation, buffer 2 N Length, select the data transformation to frequency domain in N Self-interference channel estimation;S3.scout receiver enters reconnaissance mode, after receiving, reference signal is passed through down-conversion, analog-digital conversion operation, buffer 2 N Length, select the data transformation to frequency domain in N Self-interference signal is reconstructed and cancelled using reference signal and channel estimation value, and then inverse transformed back to time domain, to obtain target signal.The application adopts the mode of combination of training mode and reconnaissance mode, solves the self-interference problem of interference reconnaissance integrated system.

The utility model discloses a multi-orifice positioning control system of a mobile hoist, which comprises an RFID (Radio Frequency Identification Device) module, a first RFID (Radio Frequency Identification Device) module and a second RFID module, wherein the RFID module comprises a first RFID arranged at each orifice and corresponding to each orifice; the RFID card reader is arranged on the movable hoist; the variable-frequency driving module is arranged on the movable hoist, is used for driving the movable hoist to move on the track and comprises a frequency converter and a variable-frequency motor connected with the frequency converter, and an encoder is arranged on a rotating shaft of the variable-frequency motor; and the control module is connected with the RFID card reader, the encoder and the frequency converter so as to acquire data of the RFID card reader and the encoder and output signals to the frequency converter so as to control the operation of the variable frequency motor. By means of the mode of combining coarse positioning and fine positioning, the movable hoist can be positioned in a high-precision mode, the positioning precision reaches + / -5mm, the production cost can be effectively controlled, and the overall cost is only 30%-40% of that of a servo system.

The invention discloses a coherent comb spectrum suppression interference method, and relates to the field of electronic countermeasures. The method comprises the following steps: receiving a radar signal, and converting the radar signal into a digital IQ signal; a plurality of coherent suppression interference modules are used for carrying out parallel modulation processing on the digital IQ signals in a digital domain, each module independently carries out modulation, and I-path signals and Q-path signals output by all the modules are added to generate coherent comb spectrum suppression interference signals, the modulation processing comprises the following steps: performing Doppler frequency modulation on the signal after amplitude modulation; performing Doppler noise modulation on the signal after Doppler frequency modulation; the modulated signal is converted into an analog signal, and the analog signal is radiated to a radar after up-conversion and amplification; wherein the coherent comb spectrum suppression interference signal is used for suppressing a real target signal at a radar receiving end. The method has the advantages of high coherence, quick response and adaptive adjustment, real target signals can be effectively submerged, and the interference effect is improved.

This invention discloses a large-aperture radio telescope system for the far side of the moon, comprising: an antenna interferometer array, an electro-optic conversion link, a lunar digital center, a relay transmitting antenna, a lunar relay satellite, and a ground data processing center. The antenna interferometer array acquires scene radiation signals using the principle of integrated aperture interferometry and transmits these signals to the electro-optic conversion link. The electro-optic conversion link receives the scene radiation signals, performs electro-optic modulation to convert them into optical signals, and transmits them to the lunar digital center. The lunar digital center demodulates the signals and transmits the modulated signals to the lunar relay satellite via the relay transmitting antenna. After up-conversion and forwarding, the signals are sent back to the ground data processing center for large-scale data processing and inversion imaging. This invention lays an important foundation for the engineering realization of a lunar-based large-aperture radio telescope.

A receiver circuit comprises a local oscillator (LO) signal generator that provides LO reference voltage signals, and a plurality of up-conversion paths that provide filtered up-converted signals. Each up-conversion path comprises a transistor and a bandpass filter. A drain of the transistor provides a mixed signal in response to one of the LO reference voltage signals at a gate of the transistor and an RF input signal at a source of the transistor. The bandpass filter has a fixed frequency that passes a first frequency component associated with a center frequency of the RF input signal and rejects a second frequency component associated with an undesired frequency in the mixed signal to provide one of the filtered up-converted signals. The fixed bandpass frequency may reject a plurality of second frequency components that are associated with a plurality of undesired frequencies of the RF input signal.

An apparatus, including: an oscillator configured to generate a clock signal; a clock signal synthesizer configured to generate a first clock signal, a second clock signal, and a third clock signal, wherein the first, second, and third clock signals are based on the clock signal; a baseband transmitter configured to generate a transmit baseband digital signal in response to the first clock signal; an ultra-wideband (UWB) pulse digital-to-analog converter (DAC) configured to generate a UWB pulse signal based on the transmit baseband digital signal in response to the second clock signal; and a frequency upconverter configured to frequency upconvert the UWB pulse signal to generate a transmit radio frequency (RF) signal based on the third clock signal.

A method for use in self-testing a transceiver integrated circuit includes: receiving a test signal, having a first intermediate frequency, at a first intermediate frequency input / output port associated with a first transceiver subcircuit of the transceiver integrated circuit; directing the test signal to a second transceiver subcircuit of the transceiver integrated circuit; upconverting the test signal to have a radio frequency; amplifying the test signal by a power amplifier, of the second transceiver subcircuit, to provide an amplified test signal; coupling at least a portion of the amplified test signal as a feedback signal; downconverting the feedback signal to a second intermediate frequency; and directing the feedback signal to a second intermediate frequency input / output port associated with the second transceiver subcircuit.

The present application relates to radar interference high-speed transmission technical field, specifically for SAR radar interference method based on high-speed data transmission, including: receiving the radio frequency signal of the interfered synthetic aperture radar transmission, the original sampling data stream is obtained through the down conversion and analog-digital conversion of radio frequency receiving front end, through high-speed serial interface transmission to programmable logic part, the pulse description word containing pulse arrival time, pulse width, pulse repetition interval, carrier frequency is extracted, the baseband waveform of coherent interference signal is reconstructed in real time according to pulse description word, the target interference intermediate frequency digital signal is generated by carrying out digital up conversion and digital predistortion processing to baseband waveform, and the interference radio frequency signal is radiated after completing digital-analog conversion and up conversion through high-speed serial interface transmission to radio frequency transmitting front end.This method can reduce data transmission and signal processing delay, guarantee the coherence of interference signal, improve the generation accuracy and processing real-time performance of intermediate frequency signal.

The application discloses a method for electronic countermeasure cooperative jamming suppression in a frequency offset scene, which comprises the following steps: S1. At the jammer, after the interference data x(n) is converted by a digital-to-analog converter and up-converted, a transmission jamming signal is generated and transmitted; S2. At the authorized receiver, after the jamming signal is transmitted through a wireless channel, the jamming signal is received simultaneously with an expected signal, down-converted to obtain a baseband receiving signal, and analog-to-digital converted to obtain a baseband digital signal; S3. The baseband receiving signal is expressed in a matrix form; S4. The fast-changing cooperative jamming joint channel coefficient is estimated, and the cooperative jamming is reconstructed and cancelled to complete the interference suppression. The application can effectively cancel the cooperative jamming under a frequency offset multipath channel, and does not need to accurately estimate the frequency offset value, but sets a frequency offset value interval, and uses multiple adaptive recursive filters in parallel to estimate the cooperative jamming coefficient.