15 results about "Digital array" patented technology

This disclosure proposes a calibration method, apparatus, electronic device, and storage medium for a digital array antenna. The method includes: determining the number of channels to be calibrated in the digital array antenna, wherein the channels to be calibrated are either transmit channels or receive channels; generating a calibration signal corresponding to the channels to be calibrated based on the number of channels, wherein the signal length of the calibration signal is greater than a first threshold, and the autocorrelation descriptor value of the calibration signal is greater than a second threshold; acquiring the coupled signal received after the calibration signal is transmitted through the channels to be calibrated and a coupling network; performing correlation detection on the calibration signal and the coupled signal to obtain channel characteristics, wherein the channel characteristics include the amplitude, phase, and delay of the channels to be calibrated; and compensating the channels to be calibrated based on the channel characteristics. Therefore, on-orbit non-linking calibration of the digital array antenna can be achieved based on a calibration signal with a long time domain length and good autocorrelation, thereby improving the overall calibration and operating efficiency of the array.

1. The name of the design product: portable calibration frame (THDS equipment). 2. The use of the design product: used for the light path calibration of railway infrared axle temperature detection system (THDS equipment); the portable calibration frame is fixed on a specific position of the steel rail, and the light path of the digital array probe is corrected to the center point of the target of the portable calibration frame (THDS equipment) by using a laser sight, so as to ensure the azimuth angle accuracy of the railway infrared axle temperature detection system (THDS equipment). 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application discloses an image texture extraction method, device and computer readable storage medium, the method comprising: converting the color value of each pixel of a target image into a different base to obtain a digital array of each pixel; wherein the base of the color value of the converted pixel is lower than the base of the color value of the pixel before conversion; according to the number of bits of the digital array, the target image is decomposed into several layers; for each layer, a window mask is used to extract texture information to obtain a sub-texture map of each layer; and all the sub-texture maps are superimposed with weights to synthesize a total texture map of the target image. Compared with traditional edge detection technology, the application can greatly improve the texture information extraction rate and texture information extraction accuracy of the target image, and provide more complete texture and edge information for downstream image information processing procedures.

This invention relates to the field of digital array antenna testing technology and discloses a rapid desktop testing method for the receiving pattern of a digital array antenna. The method includes: initializing and synchronizing a multi-channel far-field simulation device and a beamforming processor for the digital array antenna; ensuring that each transmit channel of the multi-channel far-field simulation device is phase-consistent with each receive channel of the beamforming processor through calibration and balancing; establishing a set of scanning angles based on relevant information of the digital array antenna; the multi-channel far-field simulation device generating signals corresponding to the scanning angles and injecting them into the beamforming processor; the beamforming processor extracting information for each corresponding scanning angle and transmitting it to a host computer, until all scanning angles have been traversed to obtain the far-field pattern of each beam, thus completing the entire testing process. This invention can simulate the input of a standard antenna at each incident angle under far-field conditions, enabling the testing and verification of the receiving pattern of the beamforming processor for the digital array antenna.

The application provides a DOA estimation method based on a hybrid analog-digital array architecture design, which comprises the following steps: a hybrid analog-digital array is arranged at a receiving end architecture; the hybrid analog-digital array adopts a low-complexity HAD array architecture; the hybrid analog-digital array architecture is used to receive an incident signal and model; an initial value of an analog phase shifter network is designed; a difference virtual array of the low-complexity HAD array architecture is calculated; an initial angle estimation value is obtained from the difference virtual array receiving signal by using a classical direction finding algorithm; after the initial angle estimation value is obtained, the phase shifter network weight is redesigned, and then a difference virtual array output signal is obtained; and a DOA estimation result is obtained from the classical direction finding algorithm; the method can effectively avoid the problems of phase ambiguity and beam scanning, can reduce the cost and complexity, and can effectively approach the estimation performance of a full-digital array architecture.

This invention provides a full-space staring digital array radar system. The system includes a digital antenna array, a radio frequency front-end, a beamforming network, and a control and processing center. The digital antenna array adopts a structure combining hemispherical and cylindrical surfaces, and the height of the cylindrical array and the radius of the hemispherical array must satisfy a certain relationship. During transmission, the radar controls the beamforming network and corresponding antenna elements of each subarray to transmit signals through the control and processing center. During reception, the radar echo is received by the receiving elements of the digital antenna array to form multiple echo signals, which are then processed by the control and processing center for target detection and tracking. The full-space staring digital array radar system of this invention has superior multi-target and full-space simultaneous surveillance capabilities, improving the radar's early warning efficiency across the entire airspace. It can simultaneously track multiple targets from various airspace angles, providing strong real-time full-space surveillance capabilities.

The application discloses a kind of phase correlation FDA radar quantitative transmit pattern design method, the application realizes the quantitative design of the gain of the transmit pattern in multiple discontinuous regions of interest in observation space, improves the design freedom of FDA radar.Meanwhile, the application does not constrain the baseband waveform of phase correlation FDA radar, and no longer depends on the linear frequency modulation waveform to realize the design of pattern.In addition, the technology is based on phase correlation FDA radar, and compared with traditional MIMO radar, it does not depend on complex multi-dimensional coded waveform optimization design, and the computational complexity is low.The application can be widely applied to the related application of all-digital array radar, such as air search, space monitoring.

The application discloses a kind of phase center calibration methods of large-scale broadband conformal digital array, utilize the residual frequency response error of the element pattern of M antenna, receive or transmit channel, directly estimate the array amplitude pattern at any scan angle, any radio frequency operating frequency in wide space, wide frequency range, obtain the array phase pattern in 3dB beam width. Utilize this array phase pattern, can obtain the phase center at the scan angle, radio frequency operating frequency by least square method. By discretization division to wide space, wide frequency range, the phase center value of broadband conformal digital array at different discrete azimuth and elevation under wide space range can be calculated, and then the phase center value at any scan angle in wide frequency range is obtained. Utilize the phase center value, the beam weighting coefficient of each element, time delay compensation value relative to array geometric center can be calculated. The application is not limited by far-field test or near-field darkroom test condition.

The application discloses a kind of broadband zero intermediate frequency receiving array's channel calibration and equalization method, comprising: obtaining the baseband digital complex signal of each receiving channel of digital array;Obtain baseband digital complex single frequency signal;Obtain the spectrum value of each channel single frequency signal itself and the spectrum value of corresponding image signal;Calculate the first compensation value and the second compensation value of each channel IQ imbalance frequency response;Estimate the first FIR equalizer coefficient and the second FIR equalizer coefficient of IQ imbalance;Obtain the complex signal after IQ imbalance compensation;With the first receiving channel as reference, calculate the inter-channel frequency response compensation value of other channels relative to reference channel;Estimate the third FIR equalizer coefficient between channels;When array receives target signal, compensate the baseband digital complex signal received by array;The application has the advantages that: various errors of broadband zero intermediate frequency receiving channel are estimated and compensated, and broadband zero intermediate frequency receiving digital array channel calibration and equalization are realized.

This application discloses a large-scale cascaded digital array antenna and a receiving synchronization method. The digital array antenna includes a master module, several slave modules, an antenna array, and a correction power divider network. The master module is connected to each slave module, and each slave module is connected to an element of the antenna array. The correction power divider network is connected to the multi-channel receiver chip of the master module and each slave module. Each slave module includes a slave SOC FPGA, an FPGA, a clock driver, and a multi-channel receiver chip. The FPGA integrates a DDS module, and the multi-channel receiver chip integrates an RF PLL. The slave SOC FPGA is connected to the FPGA, the clock driver, and the multi-channel receiver chip. The multi-channel receiver chip in the master module only outputs signals to the correction power divider network and does not receive any signals output by the correction power divider network. This application can achieve full amplitude and phase coherence at the element level of a large-scale digital array antenna, high-precision distributed channel synchronization correction, and high-fidelity digital beamforming, effectively ensuring the quality of digital beamforming.

This invention provides a phase self-synchronization method, apparatus, and radar for a digital array radar. The phase self-synchronization method includes the following steps: Step 1. Periodically injecting a receive correction signal into the receiving channel to obtain the offset value of the receive phase difference between channels; Step 2. Extracting the phase of the radio frequency signal leaked from the transmit channel to the receive channel, and calculating the offset value of the closed-loop phase difference between the transmit and receive channels; Step 3. Decoupling the offset value of the receive phase difference between channels from the offset value of the closed-loop phase difference between channels to obtain the offset value of the transmit phase difference between channels; Step 4. Compensating for the phase offset of each receive and transmit channel based on the offset values ​​of the receive phase difference and the transmit phase difference between channels. This invention can compensate for the phase difference drift between the receive and transmit channels in a digital array radar in real time, improving the antenna beam performance under long-term operating conditions.

The application provides a kind of wideband transmitting digital array channel fast correction device and method, it is related to digital array technical field, the device includes: digital processing module, N-way transmitting channel, correction channel and correction coupling network;The digital processing module is connected with the N-way transmitting channel and the correction channel respectively, for using wideband correction excitation signal to generate correction sample signal and output, and receive correction signal to generate correction table for processing;The N-way transmitting channel is connected with the correction coupling network, for receiving correction sample signal to generate N-way correction sample signal and input to the correction coupling network;The correction coupling network is connected with the correction channel, for selecting N-way correction sample signal and input to the correction channel;Wherein, N is greater than or equal to 1 positive integer.The technical scheme of the application has the advantages of fast correction speed, high correction accuracy, easy engineering implementation, etc.

This invention provides a digital receiver trimming method and apparatus based on a large-scale digital array antenna, comprising: acquiring digital signals at different frequencies of each antenna element and digital signals at different frequencies of a reference channel at the same time through two links, and obtaining the relative amplitude and relative phase of each element; grouping the elements according to the same digital channel and obtaining the trimming data of the elements within the digital channel; burning the trimming data of the elements within the digital channel into the corresponding digital channel sub-wave controller, adjusting the probe position and the gain or attenuation of the links, acquiring digital signals at different frequencies of each digital channel and digital signals at different frequencies of the reference channel at the same time, obtaining the relative digital signal of each digital channel, and then performing signal trimming. This eliminates the amplitude and phase errors caused by the synthesis of multiple element patterns corresponding to a digital channel, reduces the loss caused by the synthesis of the entire array pattern, and effectively improves antenna beam pointing, sidelobe level, and other parameters.

This invention discloses a hybrid beamforming method for integrated MIMO communication and radar based on overlapping subarrays. Under the conditions of hybrid analog-digital arrays, including overlapping subarray structure, transmit power, and constant mode constraints, a joint problem of maximizing communication spectral efficiency and minimizing radar beam pattern matching error is established. This joint problem is relaxed into a weighted summation minimization problem, where the designed hybrid beamformer minimizes the Euclidean distance to the optimal communication / radar beamformer. This invention decomposes the hybrid beamforming design problem into three subproblems and develops an efficient alternating minimization algorithm. The proposed hybrid beamforming design based on overlapping subarray structure offers flexibility and effectiveness in terms of spectral efficiency and radar beam pattern performance.

The application discloses a heavy high-rigidity digital array radar antenna quick erecting and withdrawing mechanism, which comprises a semitrailer platform, a transportation supporting mechanism, a rotary table, an antenna back frame, a lifting oil cylinder, a cross brace unfolding mechanism, a cross brace locking mechanism, a surface precision adjusting mechanism, a horizontal sensor, a rotary encoder and a position sensor. The application relates to the technical field of radar antennas. The heavy high-rigidity digital array radar antenna quick erecting and withdrawing mechanism has the advantages of high load capacity, good rigidity, high array surface precision and safety, and convenient erecting and withdrawing, and solves the problems of quick transfer and repeated installation precision of heavy high-rigidity radars.