107 results about "Digital intermediate frequency" patented technology

The invention particularly relates to a method for quickly capturing high-dynamic and low-carrier-to-noise-ratio signals, which comprises the following steps of: preprocessing input digital intermediate-frequency signals, performing correlation operation on stored local pseudo code data and baseband data after down-conversion, and accumulating correlation results of which the length is a set value; if the local code phase is aligned with the pseudo code phase modulated by the baseband data, a peak value is obtained through FFT, the index of the peak value indicates the Doppler frequency, and the number of FFT calculation times indicates the code phase; calculating a module value based on a real part and an imaginary part output by the FFT; judging whether capturing succeeds or not based on the maximum module value, and obtaining the Doppler frequency of rough capturing if capturing succeeds; and refining the roughly captured Doppler frequency to obtain a refined Doppler frequency. According to the method, the Doppler frequency and the code phase are accurately searched in a short time, and the method is suitable for capturing high-dynamic weak signals.

The invention relates to the technical field of array signal processing, in particular to a space-frequency power inversion anti-interference method fusing SMI-LDL decomposition. The problems that an existing space-time anti-interference technology is high in calculation complexity, and real-time processing is difficult to achieve in limited resources of a navigation receiver are mainly solved. The method comprises the following steps: firstly, converting a radio frequency signal received by an array into a digital intermediate frequency signal and carrying out sliding window partitioning processing; windowing the data block and performing FFT (Fast Fourier Transform) to obtain a frequency domain array; then calculating an auto-covariance matrix R of other array elements except the reference array element and a cross-covariance matrix r of the reference array element and other array elements; lDL decomposition is carried out on the auto-covariance matrix to obtain a lower triangular matrix L and a diagonal matrix D, and inversion is carried out on the lower triangular matrix L and the diagonal matrix D respectively, so that huge operand caused by direct inversion of the covariance matrix is avoided; and finally, calculating an optimal weighting vector according to a power inversion criterion, and performing spatial filtering on the frequency domain data.

The invention discloses a GNSS-R terminal baseband three-ring cooperative tracking method, system and device and a medium, and belongs to the technical field of satellite navigation signal processing, and the method comprises the steps: receiving a digital intermediate frequency BOC modulation satellite navigation signal; establishing a carrier tracking loop, a subcarrier tracking loop and a code tracking loop; performing frequency mixing operation on the digital intermediate frequency BOC modulation satellite navigation signal and a local carrier wave; performing correlation operation on the signal after the frequency mixing operation and a local subcarrier and a local pseudo-random code in sequence; carrying out accumulation processing on a correlation operation result to obtain a correlation accumulation value; respectively calculating error adjustment parameters of the carrier tracking loop, the subcarrier tracking loop and the code tracking loop based on the correlation accumulation values; and when the error adjustment parameters of the carrier tracking ring, the subcarrier tracking ring and the code tracking ring are all within a preset range, outputting navigation data. According to the invention, the problem that a traditional double-ring method cannot fully utilize subcarrier components is solved.

The invention discloses an interference cancellation method based on a millimeter wave radar voltage control signal, and the method comprises the steps: obtaining a digital intermediate frequency signal corresponding to a radio frequency signal, carrying out the delay alignment of the digital intermediate frequency signal to obtain a delayed digital intermediate frequency signal, and enabling the digital intermediate frequency signal to carry an interference voltage control signal; subtracting a local interference signal from the delay digital intermediate frequency signal to obtain a cancellation output signal; the local interference signal is a mirror image cancellation signal which is obtained based on frequency response compensation processing in advance and has the same amplitude and time delay as the interference voltage control signal; an interference cancellation signal which is approximately the same as the voltage-controlled leakage signal in amplitude, time delay and frequency response is generated in a digital domain, the signal is subtracted from a received signal, large-amplitude cancellation of voltage-controlled signal interference is achieved, the whole interference cancellation process is achieved only through some addition, multiplication and register units, the algorithm resource overhead is low, and the method is suitable for large-scale popularization and application. The method is easy to implement in some low-cost processors, and the hardware design pressure is reduced.

The invention discloses an interphone power saving method and device for dynamically adjusting a low noise amplifier working point, and the method comprises the following steps: S1, periodically collecting a digital intermediate frequency signal in a receiving stage, and calculating a first parameter and a second parameter, the first parameter being a current received signal strength indication value, and the second parameter being a current signal-to-noise ratio estimation value; s2, when the first parameter is higher than a first threshold value and the second parameter is higher than a second threshold value, it is judged that a low-power-consumption access condition is met; s3, when N continuous cycles all meet the low-power-consumption access condition, the baseband processor outputs a first control signal, and the bias working point of the low-noise amplifier is switched to a low-power-consumption mode; and S4, in a low-power-consumption mode, if the first parameter is lower than a third threshold value or the second parameter is lower than a fourth threshold value, outputting a second control signal, and switching the bias working point of the low-noise amplifier to a high-performance mode, thereby solving the problem of high static power consumption of the interphone receiving link on the premise of ensuring the communication reliability.

The invention discloses a carrier ring auxiliary code delay phase-locked loop tracking method, system and device and a medium, and belongs to the technical field of signal tracking, and the method comprises the steps: obtaining a digital intermediate frequency signal, and constructing a code loop model; executing code tracking through the code loop model to obtain a code phase error measurement value, and determining a relationship between a carrier-to-noise ratio and a noise covariance; a measurement noise covariance matrix model is obtained through combination of a code phase error measurement value and a carrier-to-noise ratio dynamic state and is used for first adjustment of a filter. According to the invention, a measurement noise covariance matrix is dynamically adjusted based on real-time carrier-to-noise ratio estimation, so that the filter can accurately adapt to signal quality change, fully trust an accurate measurement value when a signal is strong, greatly reduce tracking jitter, achieve higher pseudo-range measurement precision, and automatically reduce dependence on the measurement value under noise interference when a signal is weak. In turn, the method depends on smooth prior model prediction.

In a general aspect, a magnetic resonance system performs magnetic resonance measurements. In some examples, a magnetic resonance system includes a data processing device and a superheterodyne spectrometer system. The data processing device generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress a mirror sideband in the magnetic resonance control signal. The superheterodyne spectrometer generates a magnetic resonance control signal based on the digital IF signal information.

The invention discloses a chip verification platform based on an FPGA (Field Programmable Gate Array) and a verification method thereof. The platform comprises an FPGA core configured to be used for realizing prototype logic of a chip to be verified and executing digital signal processing, an intermediate frequency input module, and a system clock configured to be used for guaranteeing time sequence synchronization of all modules of the platform, the external interface is configured to support communication verification between the chip to be verified and external equipment; the debugging interface is configured to realize signal monitoring and problem positioning in a verification process; the intermediate frequency input module is configured to receive an analog intermediate frequency signal output by a radio frequency front end and provide a compliant intermediate frequency signal source for verification; the intermediate frequency input module comprises a Balun unit, an ADC unit and a CPLD data distribution module which are connected in sequence. And the CPLD data distribution module completes adaptation and distribution of digital intermediate frequency signals by dynamically switching data transmission paths and controlling multi-channel data priorities. And the chip verification efficiency and reliability are improved.

The invention discloses a special high-frequency low-level control system, which is characterized by comprising a digital signal processing board card and a radio frequency front-end board card, the digital signal processing board card mainly comprises a clock distribution unit, an ADC digital-to-analog conversion unit, a DAC analog-to-digital conversion unit, an FPGA and a cavity frequency tuning driving unit. The ADC digital-to-analog conversion unit is used for converting an intermediate frequency acquisition analog signal output by the radio frequency front-end board card into a digital intermediate frequency signal and sending the digital intermediate frequency signal to the FPGA; the DAC analog-to-digital conversion unit is used for converting the DDS excitation signal output by the FPGA into an intermediate frequency excitation analog signal and sending the intermediate frequency excitation analog signal to the radio frequency front-end The radio frequency front-end board card performs up-conversion on the intermediate-frequency excitation analog signal to obtain an RF excitation signal, sends the RF excitation signal to a high-frequency cavity for field construction, and performs down-conversion on a cavity field recovery signal to obtain an intermediate-frequency acquisition analog signal; the cavity frequency tuning drive unit comprises a motor slow tuning drive and a piezoelectric ceramic fast tuning drive; and the FPGA is used for data acquisition and loop control.

The invention provides a multi-modal fusion radar tide level intelligent adaptive filtering method, which belongs to the technical field of radar tide, and comprises the following steps: through dual-polarization radar signal acquisition, performing three-layer wavelet decomposition on vertical and horizontal polarization digital intermediate frequency signals, and marking clutter coefficients based on variance and skewness threshold values; performing adaptive soft threshold processing, evaluating residual clutter confidence coefficient by using a convolutional neural network, dynamically adjusting suppression intensity, calculating a polarization phase difference sequence, inputting the polarization phase difference sequence into a long-short-term memory network to identify a false target distance unit, and calculating multipath path parameters by combining ray tracing of a digital elevation model to perform phase compensation and amplitude correction; finally, an accurate tide level height value is obtained by detecting a real tide level distance Doppler spectrum peak value, and the technical problem that the measurement precision is reduced due to the fact that radar tide level measurement cannot effectively distinguish clutter interference and multipath false targets in a complex marine environment is solved.

The present disclosure relates to a millimeter wave transceiver device and a communication system. The device comprises: a digital intermediate frequency module, at least two millimeter wave transmission modules and at least two millimeter wave remote-end modules; the digital intermediate frequency module is connected to at least two millimeter wave transmission modules, and the at least two millimeter wave transmission modules are connected to at least two millimeter wave remote-end modules in one-to-one correspondence; the digital intermediate frequency module is configured to send the downlink radio-frequency sending signal, and receive the uplink radio-frequency receiving signal; the millimeter wave remote-end module is configured to radiate and transmit a downlink millimeter wave transmission signal, radiate and receive the uplink millimeter wave receiving signal, convert the uplink radio-frequency receiving signal, and convert the downlink radio-frequency sending signal and a downlink millimeter wave transmission signal; the millimeter wave transmission module is configured to transmit downlink radio-frequency sending signal and uplink radio-frequency receiving signal between the digital intermediate frequency module and the millimeter wave remote-end module.

The invention discloses a signal-to-noise ratio estimation-based self-adaptive dual-frequency joint acquisition method, system and device and a medium, and relates to the technical field of satellite navigation communication, and the method comprises the following steps: obtaining a digital intermediate frequency signal; performing parallel correlation processing on a first frequency point signal and a second frequency point signal in the digital intermediate frequency signal to generate a first correlation peak matrix and a second correlation peak matrix; estimating a signal-to-noise ratio based on the first correlation peak matrix; generating a first adaptive weight coefficient based on the signal-to-noise ratio, and determining a second adaptive weight coefficient based on the first adaptive weight coefficient; respectively applying the first adaptive weight coefficient and the second adaptive weight coefficient to carry out weighted fusion to generate a fusion judgment matrix; and searching a maximum peak value in the fusion judgment matrix, and when the maximum peak value exceeds a preset fusion judgment threshold, determining that the capture is successful. Decision oscillation can occur at the critical point of the signal-to-noise ratio, and decision jitter is avoided by distributing weights and utilizing information of two channels to carry out fusion judgment.

This invention discloses a signal processing method and apparatus. The method includes: performing analog-to-digital conversion on acquired analog broadband radar signals to obtain digital intermediate frequency (IF) signals; processing the digital IF signals to obtain tagged signals; statistically analyzing the tagged signals to obtain sorting results; matching the sorting results with signal types in a database to obtain matching results; and outputting the matching results as target output signals. The solution provided by this invention enables signal parameter measurement and sorting identification.

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The invention discloses a high-resolution long-acting-distance synthetic aperture radar signal preprocessing method, and relates to the technical field of radar signal processing. The method comprises the following steps: determining a sampling rate and a sampling point number; performing analog-to-digital conversion on the analog intermediate-frequency signal, and acquiring data to obtain a digital intermediate-frequency signal; performing dechirp processing to obtain a point target radar echo signal; performing filtering processing to obtain a radar echo signal of the region of interest; reducing the radar echo signal of the region of interest into a linear frequency modulation signal through frequency modulation reconstruction; sampling the signal after frequency modulation reconstruction to obtain a corresponding signal sample sequence; reducing the length of the signal sample sequence in a data accumulation mode; and performing pulse compression on the signals in the accumulated signal sample sequence by adopting a preset pulse compression method. According to the invention, the difficulty of pulse compression, the requirements on hardware storage space and computing resources, the implementation difficulty of an analog receiver, and the pressure and processing difficulty of subsequent recording are reduced.

The invention discloses a service-adaptive satellite-borne non-uniform multicarrier demodulation device, and belongs to the field of digital signal processing. The method comprises the following steps of: firstly, performing orthogonal down-conversion and resampling filtering processing on a digital intermediate frequency signal sampled by an ADC (Analog to Digital Converter), processing the digital intermediate frequency signal by a non-uniform channelization splitter, and then serially outputting the digital intermediate frequency signal to a spread spectrum ratio self-adaptive variable burst capturer according to fixed quadruple sampling to capture a leading head and identify the spread spectrum ratio; the method comprises the following steps: completing symbol synchronization and de-spreading processing on an input signal according to a spread spectrum ratio, then completing carrier coarse synchronization and pattern word identification, completing modulation mode identification and carrier synchronization according to a pattern word, performing channel decoding through a multi-mode decoder to recover to an information bit stream, and outputting the information bit stream. And the information bit stream is sent to a service frame recombination processor for search identification and recombination splicing, and output is carried out after whole-frame CRC check is carried out. The method has the advantages of flexibility in use, low resource occupation and capability of realizing adaptive demodulation of variable-rate, multi-modulation-mode and multi-coding-mode service transmission signals without parameter configuration.

The invention discloses a pseudo code phase modulation continuous wave height measurement device and a height measurement method for out-of-range distance measurement, and mainly solves the problem that an output error is easy to occur when an existing distance measurement altimeter exceeds a height measurement range. The device comprises a receiving antenna, a transmitting antenna, a radio frequency transmit-receive unit, a power supply unit, an A / D unit, a signal processing unit and an interface unit. The signal processing unit comprises a DSP (Digital Signal Processor) and an FPGA (Field Programmable Gate Array), the DSP generates a transmitting pseudo code sequence, the transmitting pseudo code sequence is transmitted to the transceiving unit through the FPGA to be transmitted to the ground, the transmitting pseudo code sequence is converted into a receiving pseudo code sequence after being reflected by the ground, and the receiving pseudo code sequence is converted into a digital intermediate frequency signal through the transceiving unit and the A / D unit to be transmitted to the FPGA for demodulation to obtain a baseband signal; the baseband signal and the local pseudo code are subjected to correlation peak value calculation and then transmitted to the DSP for accumulation, and a height value is calculated according to the phase difference between the local pseudo code and the received pseudo code and transmitted to the interface unit through the FPGA to be output. The method can autonomously identify an out-of-range distance measurement condition, effectively reduces the probability of outputting a wrong height, and can be used for height measurement and radar distance measurement of an aircraft.

The present invention relates to a high-orbit Beidou signal capture method and capture device. The capture method includes: converting a Beidou satellite signal into a digital intermediate frequency signal, determining the number of sampling points of a 1-millisecond signal; determining Fourier transform compensation data and inverse Fourier transform compensation data; mixing the 1-millisecond digital intermediate frequency signal with a local carrier to strip the carrier; performing Fourier transform compensation on the carrier stripping signal and then Fourier transforming it; performing Fourier transform compensation on a 1-millisecond local ranging code sequence and then Fourier transforming it; conjugate multiplying the two Fourier transform results; performing inverse Fourier transform on the conjugate multiplication result and then performing inverse Fourier transform compensation; delaying the inverse Fourier transform compensation result by one code phase and then performing a differential coherence operation; and using the cumulative sum of the differential coherence results to perform peak value judgment. When the peak value is greater than or equal to a threshold, the signal is successfully captured. This method saves storage and computing resources, is less affected by noise, and has high signal capture sensitivity.

The invention relates to a self-adaptive pulse interference suppression method and device, computer equipment and a storage medium. The method comprises the following steps: carrying out sliding window energy detection on a digital intermediate frequency signal output by the front end of a satellite navigation receiver to obtain a pulse interference duty ratio, carrying out FFT (Fast Fourier Transform) on an interference time period signal to extract an effective bandwidth, establishing a carrier-to-noise ratio loss estimation model of two strategies of time domain zero setting and frequency domain spectral line elimination, substituting parameters to calculate a loss value, and calculating the loss value according to the carrier-to-noise ratio loss estimation model. And preferentially executing interference suppression. According to the method, intelligent adaptation of an interference suppression strategy is realized, carrier-to-noise ratio loss is minimized, the robustness and availability of a receiver in a complex electromagnetic environment are improved, the algorithm compatibility is high, engineering integration is easy, and the method has the expansion potential of combining machine learning optimization.

The invention discloses a DPE / INS quasi-deep combination method and system in a GNSS navigation domain, and the method comprises the steps: collecting a GNSS digital intermediate frequency signal through a hardware platform radio frequency front end of a GNSS receiver, inputting a local signal and the digital intermediate frequency signal into a correlator after determining a parameter search range of a local copied signal, and obtaining a PVT estimation result and covariance of a DPE receiver through maximum likelihood estimation; meanwhile, the PVT estimation result and covariance of the INS at the current moment are calculated through inertial navigation calculation, and the PVT estimation result and covariance of a DPE / INS combined system are obtained through combined filtering of the PVT estimation result and covariance of the DPE receiver and the INS and used for determining the parameter search center, the search range and the search step length of a local copy signal of the DPE receiver; a series of local replication signals are then determined. According to the method, the function of the INS sensor in the navigation domain of the DPE receiver is determined by utilizing the characteristic that the INS is not interfered by the environment, an interaction mechanism of the INS auxiliary information in the related domain and the navigation domain is established, and the interaction mechanism is named as a quasi-deep combination according to the characteristics of the architecture, so that the DPE receiver is effectively helped to narrow the search range and improve the precision.

The application provides a general radar array element level multi-target simulation method. After target echo signals received by a radar array surface are converted by an analog-to-digital converter, the target echo signals are usually digital intermediate frequency echo signals. The application can simultaneously simulate digital intermediate frequency signals of multiple targets under the condition that a radar array front end or an external test environment is not provided, and the digital intermediate frequency signals are subjected to digital down-conversion processing to obtain baseband signals. The baseband signals are multiplied by a steering vector of the targets on different array elements to obtain radar array element level multi-target simulation signals. The number of targets, amplitudes, angles, distances, speeds and array element information can be parameterized and configured, the verification and development efficiency of subsequent algorithms is greatly improved, the research and development cost is reduced, and the application has the characteristics of strong universality, high flexibility, fast development efficiency and wide adaptation to scenarios.

Described herein are systems, methods, and other techniques for handling timing in a satellite communication system having a gateway and a terminal. PDUs to be transmitted are received at the gateway. A traffic adapter computes a release time at which a baseband frame containing the PDUs is to be released. The traffic adapter generates the baseband frame containing the PDUs and a timing packet including a reference time. The traffic adapter tags the release time to the baseband frame. A virtual transmitter modulates the baseband frame, generates a digital IF packet containing the modulated baseband frame, and inserts the release time into a header of the digital IF packet. A digitizer releases the modulated baseband frame at the release time for transmission to the terminal via a satellite.

In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The application provides a multi-modal fusion radar tide intelligent adaptive filtering method, and belongs to the technical field of radar tide.The application collects dual-polarized radar signals, performs three-layer wavelet decomposition on vertical and horizontal polarization digital intermediate frequency signals, and marks clutter coefficients based on variance and skewness threshold values, performs adaptive soft threshold processing, and utilizes a convolutional neural network to evaluate residual clutter confidence and dynamically adjust suppression strength, calculates a polarization phase difference sequence and inputs a long short-term memory network to identify false target distance units, combines ray tracing calculation of a digital elevation model to calculate multipath path parameters for phase compensation and amplitude correction, and finally detects real tide height distance Doppler spectrum peak values to obtain accurate tide height values, thereby solving the technical problem that radar tide measurement in a complex marine environment cannot effectively distinguish clutter interference and multipath false targets, resulting in a decrease in measurement accuracy.

The application discloses a chip verification platform based on FPGA and a verification method thereof, and the platform comprises an FPGA core configured to realize prototype logic of a chip to be verified and perform digital signal processing, an intermediate frequency input module, a system clock configured to guarantee timing synchronization of modules of the platform, an external interface configured to support communication verification between the chip to be verified and external equipment, and a debugging interface configured to realize signal monitoring and problem positioning of a verification process; the intermediate frequency input module is configured to receive an analog intermediate frequency signal output by a radio frequency front end and provide a compliant intermediate frequency signal source for verification; the intermediate frequency input module comprises a Balun unit, an ADC unit and a CPLD data distribution module connected in sequence; the CPLD data distribution module completes adaptation and distribution of a digital intermediate frequency signal by dynamically switching a data transmission path and controlling a priority of multi-channel data. The chip verification efficiency and reliability are improved.

The invention relates to a medium-frequency-band super-large-scale MIMO prototype system, which comprises a user side and a base station side comprising an upper computer module and subsystems, and is characterized in that the upper computer module sends and receives an original bit stream or a received bit stream; a baseband MIMO signal processing module in the subsystem corresponds to forward and reverse combination processing of downlink and uplink related to modulation and coding, and an analog-digital conversion and digital intermediate frequency module in the subsystem corresponds to forward and reverse combination processing of downlink and uplink related to modulation, frequency conversion and conversion; a first radio frequency front-end module in the subsystem performs frequency conversion and transceiving on a radio frequency signal so as to realize communication with a user side; the prototype system designed by the invention meets the configuration of the medium-frequency-band super-large-scale MIMO system, has the characteristics of flexible expansion and deployment, supports multi-user real-time uplink and downlink data service transmission, is large in bandwidth and high in throughput, and can be used for key technology verification and rapid deployment test of an advanced communication algorithm.

A method for optimizing the suppression of FMCW radar transceiver leakage and stationary clutter is provided, wherein the analog anti-interference signal generated after analog memory calibration and the real-time intermediate frequency signal are subjected to difference and amplification processing in the analog domain as analog memory compensation; the digital anti-interference signal generated after digital memory calibration and the real-time digital intermediate frequency signal after analog memory compensation are subjected to difference processing in the digital domain as digital memory compensation, thereby finally achieving deep compensation for transceiver leakage and stationary clutter. The present invention utilizes the characteristics that the transceiver leakage and environmental clutter of the FMCW radar are superimposed on the intermediate frequency signal, and realizes comprehensive and deep suppression of transceiver leakage and environmental clutter at the same time by performing analog memory feedback compensation and digital memory feedback compensation on the intermediate frequency signal.

The invention discloses a feed baseband rapid dynamic frequency offset compensation method and device. The device comprises a baseband unit and a radio remote unit. The baseband unit is responsible for frequency offset estimation and compensation amount calculation, the remote radio unit is composed of a CPU, an FPGA and an RFIC, the FPGA is used for digital intermediate frequency processing and a forward transmission interface, and the CPU completes parameter updating of an uplink numerical control oscillator and a downlink numerical control oscillator according to compensation information and achieves frequency offset correction of intermediate frequency signals so as to complete frequency offset compensation; then, the CPU controls the FPGA to send a real-time response message, and feeds back a compensation execution completion state to the baseband unit to form closed-loop control; according to the method, the special control frame is constructed in the eCRPI interface, so that the real-time dynamic compensation of the satellite feed baseband frequency offset is realized, and the stability and the high reliability of a satellite-ground link in a high-speed moving environment are ensured.

The invention discloses a method for realizing dual-polarization phased array weather radar target simulation by using a digital receiver, and relates to the technical field of radar signal processing. According to the method for realizing dual-polarization phased array weather radar target simulation by utilizing the digital receiver, a weather target micro-physical parameter model is established, abundant FPGA resources in the phased array radar digital receiver are combined, and a similar direct digital frequency synthesis (DDS) technology is utilized, so that a high-fidelity digital intermediate frequency echo signal is generated; dynamic target simulation is realized in an active array digital receiver of a phased array radar. Controllable and repeatable simulation of various weather phenomena (rain, snow, hail and the like) can be realized in a laboratory environment. Under the condition of not depending on external hardware, echo characteristics of weather targets (such as rainfall particles), including parameters such as distance, speed, amplitude and dual-polarization parameter quantity, are simulated, and debugging, performance verification and algorithm testing of a radar system are effectively supported.

The present invention discloses a digital baseband and a qubit manipulator for low-temperature qubit manipulation. The digital baseband combines DDS and AWG modes, utilizing the DDS mode to achieve efficient frequency, phase, and amplitude adjustment, and the AWG mode to provide arbitrary waveform generation capabilities, thereby meeting the requirements of qubits when performing complex operations. Furthermore, since both the X-channel DDS module and the Y-channel DDS module of the XY driver have a digitally controlled oscillator, they can simultaneously generate independent digital intermediate frequency pulses, achieving frequency division multiplexing. This allows for direct output of simple sin waves, as well as reading waveform pulse data from the XY channel memory to output corresponding modulated pulse waveform data according to different requirements. Therefore, the present invention not only enables efficient and flexible qubit manipulation, but also enables multiple signals to share the same communication channel, optimizing channel utilization and thereby improving the overall transmission efficiency of the digital baseband.