124 results about "Antenna measurement" patented technology

A system and method for testing an antenna-under-test (AUT). A multi-probe antenna array transmitter is moved to a plurality of positions within a scan area. At each position, each probe antenna element of the transmitter transmits a near-field (NF) over-the-air (OTA) signal to the AUT. An alignment procedure is performed to align transmission locations for signals transmitted by different ones of the plurality of probe antenna elements. Correction factors are determined that characterize amplitude and phase discrepancies between the probe antenna elements of the transmitter. The correction factors are applied to the signals, and the corrected signals are combined at each transmission location to obtain average signals. A far-field (FF) reception pattern for the AUT is determined based on a discrete Fourier transform of the average signals and stored in a non-transitory computer readable memory medium.

The invention discloses a spherical near-field antenna measurement method and system, and the method comprises the steps: generating a sampling point coordinate sequence on a measurement spherical surface based on a preset algorithm, and enabling the sampling point coordinate sequence to form a continuous spiral track from a first pole to a second pole; controlling the measuring probe to move at a constant speed along the continuous spiral track, and synchronously acquiring near-field complex electric field data of the to-be-measured antenna when the measuring probe moves to each sampling point to form a complex electric field data vector; constructing a linear equation of spherical wave expansion based on the complex electric field data vector, the sampling point coordinates and the measured spherical radius, and solving the linear equation by adopting a regularization method to obtain a spherical wave coefficient vector; and calculating a far-field pattern of the to-be-tested antenna based on the spherical wave coefficient vector. According to the invention, the technical problems of high sampling redundancy, discontinuous mechanical scanning path, dependence on interpolation and low precision in the existing antenna measurement technology are solved.

The invention relates to the technical field of wireless detonating devices. The invention discloses a self-adaptive resonance adjusting device for a through-the-earth transmitting antenna. The self-adaptive resonance adjusting device comprises a through-the-earth antenna; an adjustable capacitor array and an antenna measuring unit are arranged in the tuning capacitance box, the adjustable capacitor array is connected with the through-the-earth antenna and used for achieving continuous adjustment of a capacitance value within an nF-level range so as to tune an electromagnetic wave signal of the through-the-earth antenna, and the antenna measuring unit is arranged at the output end of the adjustable capacitor array and used for measuring the electromagnetic wave signal of the through-the-earth antenna. The impedance sensor is used for measuring the real impedance of a resonant circuit of the through-the-earth antenna to obtain an output end digital signal; an antenna driver and a tuning controller are arranged in the driving cabinet, and the antenna driver is connected with the adjustable capacitor array and used for outputting a radio frequency driving signal to the adjustable capacitor array; the tuning controller is connected with the adjustable capacitor array and the antenna measuring unit and is configured to receive the output end digital signal sent by the antenna measuring unit to the tuning controller and adjust the capacitance of the adjustable capacitor array in response to the output end digital signal.

The invention provides a two-dimensional expansion type SAR satellite in the field of SAR satellites. The two-dimensional expansion type SAR satellite comprises a satellite body, an SAR antenna, a solar array, a phased array data transmission antenna, a star sensor, an antenna measurement and control antenna, a ground wire measurement and control antenna, an electric thruster and other key components. A unique two-dimensional unfolding mechanism is adopted in the satellite design, so that the satellite can be loaded with a larger SAR (Synthetic Aperture Radar) antenna; the solar array is folded and pressed on the side face of the satellite body, the phased array data transmission antenna and the ground wire measurement and control antenna are installed on the side face (to the ground) of the satellite body, and the star sensor is installed on the top of the satellite body through a carbon fiber support. Space envelope resources in the fairing are fully utilized, the satellite is small in size in the folded state, the satellite structure is stable and reliable, and the fairing can adapt to various observation tasks.

The invention relates to the technical field of radar measurement, and discloses a radar antenna measurement system, which comprises a radar antenna subarray, a wave controller, a synthesizer, a signal receiving channel and a processor, and is characterized in that the radar antenna subarray is used for transmitting an electromagnetic wave detection signal to a target and receiving a first echo signal reflected by the target; the wave controller is used for performing phase change processing on the phase of part of the first echo signal to obtain a processed echo signal; the radar antenna subarray is also used for transmitting the processed echo signal and the echo signal which is not processed by the wave controller in the first echo signal to the synthesizer; the synthesizer is used for synthesizing the received echo signal to obtain a second echo signal and transmitting the second echo signal to the signal receiving channel; the signal receiving channel is used for performing analog-to-digital conversion processing on the second echo signal to obtain a first digital echo signal and transmitting the first digital echo signal to the processor; the processor is used for measuring and determining position information of the target according to the first digital echo signal. According to the invention, hardware resources of the radar system are saved.

The present invention discloses a device and method for improving the AoA measurement accuracy of UWB. The device includes a UWB chip, three external antennas, three internal antennas, a main control MCU, and a power supply. The three external antennas and the three internal antennas are both distributed in an equilateral triangle. The distance between the internal antennas is less than λ / 2, the distance between the external antennas is greater than λ / 2, and the connecting lines between the internal antennas and the connecting lines between the external antennas are parallel, and the distance between the external antennas is twice the distance between the internal antennas. When working, the azimuth angle is calculated by using the external antenna measurement received phase difference obtained by the external antenna with an antenna spacing d greater than half the wavelength λ / 2 of the signal, which can improve the accuracy of the final calculation. By using the internal antenna measurement received phase difference obtained by the internal antenna with an antenna spacing d less than half the wavelength λ / 2 of the signal to correct the external antenna measurement received phase difference obtained by the external antenna, the ambiguity can be avoided, thereby achieving the design purpose.

The utility model discloses an antenna technical parameter measurement device and synchronous positioning measurement equipment relates to antenna measurement technical field. The device includes double satellite navigation module, including first satellite navigation unit and second satellite navigation unit, is used for receiving satellite signal and measures the heading angle, inertia measurement unit is used for measuring the pitch angle and the roll angle, microcontrol unit is connected with double satellite navigation module and inertia measurement unit respectively, is used for fusing heading angle, pitch angle and roll angle generation three -dimensional attitude data, communication module is connected with second satellite navigation unit, is used for obtaining real -time dynamic difference positioning information. The device through the multi -source data fusion of double satellite navigation unit and inertia measurement unit has realized high -precision three -dimensional attitude measurement, and combines real -time dynamic difference positioning technology simultaneously, has improved positioning precision and the reliability of attitude measurement significantly, is applicable to the application scene that needs accurate space attitude perception.

Provided herein are high-performance, compact probes for use in near-field antenna measurement, such as over-the-air antenna measurements. In particular, the probes herein simplify detection by mixing the near-field radio frequency (RF) signal with a local oscillator (LO) right at the probe plane.

The invention provides a probe calibration method for a multi-probe antenna measurement system, and the method comprises the steps: carrying out the measurement of a first amplitude-phase parameter of a first probe located at a target position, enabling at least one probe to move along a preset track, and further measuring a second amplitude-phase parameter of a second probe located at the target position, after amplitude-phase parameter measurement is carried out on the two probes at the same target position, accurate relative amplitude-phase data between the two probes can be obtained according to the measured first amplitude-phase parameter and the measured second amplitude-phase parameter, then accurate calibrated amplitude-phase data of the first probe and the second probe are determined and obtained, accurate calibration of the first probe and the second probe is achieved, and the accuracy of calibration of the two probes is improved. Therefore, the subsequent accurate measurement of the antenna is ensured, the accurate position of the antenna does not need to be calibrated, and errors caused by manual operation (positioning) are avoided.

This invention discloses an online super-resolution imaging method for scanning radar based on the minimization criterion. By establishing an azimuth echo convolution model and discretizing it, the super-resolution problem is transformed. Under a regularization framework, the minimization criterion is used to construct an analytically optimizeable cost function containing sparse prior information, transforming the forward-looking imaging resolution improvement problem into an optimization estimation problem. By dividing the antenna measurement matrix into rows and blocks, matrix operations are degraded into the continuous accumulation of vector operations, enabling real-time online updates of targets in the forward-looking region. Finally, the conjugate gradient method is used to degrade and invert the matrix, outputting the super-resolution result. This method can achieve rapid imaging with limited system memory through an online conjugate gradient super-resolution algorithm based on the minimization criterion. Compared with existing batch processing regularization methods, it eliminates false targets, significantly reduces computational complexity, and is beneficial for rapid imaging of scanning radar.

The application relates to the technical field of radar measurement, and discloses a radar antenna measurement system, which comprises a radar antenna subarray, a wave controller, a synthesizer, a signal receiving channel and a processor. The radar antenna subarray is used for emitting an electromagnetic wave detection signal to a target and receiving a first echo signal reflected by the target. The wave controller is used for performing phase change processing on the phase of part of the first echo signal to obtain a processed echo signal. The radar antenna subarray is further used for transmitting the processed echo signal and an echo signal in the first echo signal which has not been processed by the wave controller to the synthesizer. The synthesizer is used for performing synthesis processing on the received echo signal to obtain a second echo signal and transmitting the second echo signal to the signal receiving channel. The signal receiving channel is used for performing analog-digital conversion processing on the second echo signal to obtain a first digital echo signal and transmitting the first digital echo signal to the processor. The processor is used for measuring and determining the position information of the target according to the first digital echo signal. The application saves the hardware resources of the radar system.

The application discloses a positioning method and device, electronic equipment and storage medium, belongs to the communication technical field, is applied to electronic equipment, includes first main body and second main body, first antenna, second antenna and third antenna are arranged on the first main body, the fifth antenna is arranged on the side of the first main body, the fourth antenna is arranged on the side of the second main body, the method comprises the following steps: receiving the positioning signal corresponding to the positioning target using each antenna;Whether the positioning target is in the measurement range of the first antenna and the third antenna is judged according to the measurement result of the first antenna and the third antenna;In the case of being in the measurement range, the incidence angle of the positioning target is determined based on the measurement result of the first antenna and the third antenna to the positioning signal;In the case of not being in the measurement range, the incidence angle of the positioning target is determined based on the measurement result of the fourth antenna and the fifth antenna to the positioning signal;The position of the positioning target is determined based on the incidence angle of the positioning target and the measurement result of each antenna to the positioning signal.

In one embodiment, a method implemented by an electromagnetic imaging system for imaging material within a metal container, the method comprising: transmitting to. and receiving signals from, a plurality of antennas attached to an interior wall of the metal container, the signals delivered over a plurality of channels, each of the plurality of antennas comprising a ferrite loaded, shielded half-loop antenna; measuring a plurality of scattering parameters (S-parameters) for all of the plurality of channels; calibrating the measurements; and providing an image of the material using an inversion algorithm based on the calibrated measurements.

Disclosed is an over-the-air (OTA) antenna meter application (“meter app”) that wirelessly connects to an OTA antenna meter (“meter”) installed with an OTA antenna and presents information that facilitates a user in installing the OTA antenna at the premises of a customer. For example, the meter app can help the user in pointing and peaking the OTA antenna for one or more broadcast channels, e.g., those selected by the customer. The meter app can store installation information of the OTA antenna for various installations, which can be used in generating a recommendation of, or predicting, installation information for installing the OTA antenna at a specified address. The predicted installation information can include broadcast channels that would be available for reception at the specified address and their signal strength, a specific location of installation on the premises, or whether a pre-amplifier and / or filter is required.

A system for testing a radio transmitter includes multiple unmanned aerial vehicles (UAVs). The multiple UAVs are deployed in the environment surrounding the radio transmitter, enabling simultaneous measurement of the signal emitted by the radio transmitter at multiple points in a variety of configurations. In some implementations, one of the UAVs can be configured as a control unit that facilitates communication between the radio transmitter and the remaining UAVs. In this manner, measurements can be transmitted from the UAVs to the transmitter in real-time. These measurements can then be used as feedback to quickly adjust the radio transmission or reception or to update the flight pattern of the UAVs.

This invention belongs to the field of impact resistance technology and discloses a wireless measurement method for high g-value acceleration during a collision process. The method includes installing a sensor and supporting circuitry; installing a transmitter and transmitting antenna; overload-resistant potting reinforcement of the measurement module; configuring a wireless receiving device for impact data; and performing acceleration data analysis and processing. This method, by installing a high-overload-resistant wireless transmission measurement device on an experimental model, achieves wireless measurement of acceleration data during the collision process, solving the problem of measuring high g-value acceleration data in high-speed collisions, explosions, and other events. Utilizing wireless transmission, this method eliminates the need for retrieval of measurement and recording equipment, avoiding the problem of difficulty in installing signal transmission lines on high-speed moving objects. It is particularly suitable for situations where high collision velocities generate peak accelerations of tens of thousands of g, and wired data transmission is difficult, thus possessing practical engineering value.

The invention relates to a small broadband microwave anechoic chamber based on a non-uniform artificial surface, the small broadband microwave anechoic chamber comprises a 36-polygon cylindrical shell, a broadband artificial medium wave-absorbing unit and a transmitting antenna, the broadband artificial medium wave-absorbing unit is attached to the inner wall of the 36-polygon cylindrical shell, edges are uniformly arranged on the 36-polygon cylindrical shell at intervals along the perimeter direction of the outer side of the 36-polygon cylindrical shell, and the transmitting antenna is arranged on the outer side of the 36-polygon cylindrical shell. A transmitting antenna is attached between every two adjacent edges, and the transmitting antennas are microstrip patch antennas. The broadband artificial medium wave-absorbing unit can effectively absorb 8-12 GHz electromagnetic waves incident at 0-70 degrees, has the advantages of multiple angles, broadband and high absorptivity, and provides a high-quality low-reflection test environment for scenes such as antenna measurement and microwave imaging which have strict requirements on the electromagnetic environment; the device is small in size, compact in structure and easy to install and integrate, the used materials are common materials, large-scale expansion is easy, and the device has the advantages of being passive, easy to machine and low in cost.

Techniques may include receiving signal measurements of one ranging signal that is transmitted by a first satellite of a global navigation satellite system, where the one ranging signal is measured by the device's antennas, each measurement corresponding to a different path to the antennas of the mobile device. In addition, the techniques may include identifying a path delay for each signal measurement. Techniques may include simulating, for different locations, possible paths between the mobile device and the first satellite, where the possible paths include at least one path that reflects from a building in a map model around a previously measured location of the mobile device; determining an estimated path delay for each simulated path; comparing the path delay for each signal measurement to each estimated path delay to identify at least one matching simulated path for each signal measurement; and determining a location of the mobile device.

The invention discloses an integrated sensing and backscatter communication method and device based on phase-free extension Rytov approximation, and relates to the technical field of communication, and the method comprises the steps: generating a modulation signal through a transmitting antenna based on the load impedance of a dynamic modulation tag, and backscattering the modulation signal to a receiving antenna to measure an RSSI vector, determining an environment object tag structure power vector and a tag antenna power vector, and after sensing and identifying a tag according to the determined combined xRA relative dielectric constant comparison vector and the tag antenna xRA relative dielectric constant comparison vector, activating the tag through a transmitting antenna and transmitting communication data to a receiving antenna by adopting ASK (Amplitude Shift Keying) modulation; and demodulating by combining the environment object tag structure power vector, the tag antenna power vector and the RSSI vector corresponding to the communication data, and determining information bits. Sensing and backscatter communication are realized by adopting non-phase backscatter based on extended Rytov approximation, and backscatter communication which keeps stable is assisted on the whole.

The invention relates to a receiver, a system comprising such a receiver, and a receiving method. A receiver (10) is provided. The receiver (10) comprises: at least one port (11) for directly or indirectly connecting at least one antenna (16); and a processing unit (12) connected to the at least one port (11). In this case, the processing unit (12) is configured to measure at least one noise parameter with respect to the at least one antenna (16), in particular in a specific frequency range. In addition to this, the processing unit (12) is configured to correlate the at least one noise parameter measured in each case with at least one antenna load characteristic for detecting the at least one antenna (16) and / or for determining a respective type of the at least one antenna (16).

The invention relates to an enhanced satellite positioning terminal external field test system and method integrated with network quality real-time monitoring, and the system comprises a main control computer which is used for transmitting a test instruction, configuring parameters, and collecting data, recording and analyzing; the network quality monitoring unit is used for monitoring the performance index of a downlink in real time and transmitting back the measured data in real time, and measuring the air interface network signal quality by adopting an external independent antenna; the positioning data acquisition unit is used for receiving satellite signals; the external field test equipment is used for providing a test network environment; wherein the main control computer uniformly controls the network quality monitoring unit and the positioning data acquisition unit, so that network measurement and positioning measurement keep the same sampling frequency, synchronous data acquisition is carried out, and a timestamp is recorded for each frame of data. The network quality can be accurately monitored in real time, and indisputable data support is provided for validity judgment of test results.

The invention discloses a mid-field phase-free antenna measurement method, which relates to the field of wireless communication and antenna testing, and can efficiently reconstruct a far-field radiation pattern of an antenna only by two to three measurement distances by performing power measurement of a small distance in a mid-field area and combining a simplified polynomial extrapolation technology. According to the method, the relevance between the antenna array excitation mode and the polynomial fitting item is determined through theoretical derivation, and the dominant polynomial item is selected for fitting, so that the measurement time and the equipment cost are remarkably reduced. Experimental verification shows that the method can still reconstruct the antenna pattern with high precision when the midfield measurement distance is smaller than one fourth of the far field distance, and is suitable for the air interface test of a 5G large-scale MIMO base station.

The invention relates to the technical field of wireless communication, in particular to an antenna comprehensive measurement and control experiment device which comprises a rail base and a movable frame, a transmitting antenna sampling frame is arranged at the top of a sliding table, a receiving antenna sampling frame is fixed to the right side of the rail base, and a holder is fixedly installed at the top of the receiving antenna sampling frame. The computer display screen is electrically connected with an antenna measurement controller and a vector network analyzer through cables. According to the antenna comprehensive measurement and control system based on virtuality and reality combination and the experimental device, according to the characteristics of radio wave propagation and antenna radiation, proper materials are selected, the structure of an antenna sampling frame system is scientifically constructed, a control circuit is designed to intelligently control the translation, levelness, polarization and other degrees of freedom of a test antenna, and by planning and designing a software interface and a process, the comprehensive measurement and control of the antenna is realized. And a controller of the vector network analyzer and the sampling frame is controlled by a program, related measurement of the antenna is carried out according to set steps, and a test result is efficiently processed and displayed.

The invention relates to the field of antenna measurement, in particular to a multi-probe test system and method based on a distributed source / receiver, and the system comprises a receiver unit which comprises a first power divider, a second power divider and a multi-port receiver which is connected with probes, a reference auxiliary port of the multi-port receiver is connected with a shunt port of the first power divider, a reference signal port of the multi-port receiver is connected with a shunt port of the second power divider, and a main port of the second power divider is connected with a first output end of the clock distributor; the antenna link unit comprises an antenna, a directional coupler and an amplifier unit, and the directional coupler is connected with a main path port of the first power divider; and the antenna transceiving unit comprises a first dual-port transceiving module, a reference signal port of the first dual-port transceiving module is connected with the second output end of the clock distributor, a receiving port of the first dual-port transceiving module is connected with a shunt port of the first power divider, and a transceiving port of the first dual-port transceiving module is connected with the amplifier unit.

The application discloses a high-performance three-mirror compact range antenna measurement system based on NURBS, combines a non-uniform rational B-spline curve surface fitting algorithm with a terahertz three-mirror compact range design, gives a new application of the non-uniform rational B-spline modeling technology according to electromagnetic background and aperture field distribution of a terahertz frequency band, realizes shape conversion of a beam aperture section from a circular shape to a square shape, takes into account the advantages of the B-spline, can realize free distribution of a grid, obtains a shaped surface of a compact range aperture meeting requirements, and solves the adaptation problem of the non-uniform rational B-spline in the shaping surface design process of the three-mirror compact range. In addition, in the process of the three-mirror compact range design, a good energy mapping condition is explored, the energy attenuation relationship function of the edge of a quiet zone is optimized by adjusting light and a propagation path, the energy dispersion problem caused by diffraction of light at the edge of a primary mirror is further solved, and the performance of the whole three-mirror compact range system is improved.

The invention provides a distributed antenna position measurement method and device and a storage medium, and belongs to the technical field of antenna measurement, and the method comprises the steps: obtaining original antenna latitude and longitude data from RTK equipment, carrying out the coordinate conversion of the original antenna latitude and longitude data, and obtaining a target antenna latitude and longitude coordinate; the original antenna latitude and longitude data comprises an original reference test point latitude and longitude coordinate and a plurality of original distributed antenna latitude and longitude coordinates; and performing antenna measurement data analysis on the longitude and latitude coordinates of each target antenna to obtain a relative distance length predicted value and a relative elevation difference predicted value. According to the invention, the problems that the total station or the laser range finder is low in distributed antenna position measurement precision, complex in operation and limited in sight distance requirement are solved, and the debugging efficiency of distributed antenna position installation in an external field test is effectively improved; and the problem of low measurement precision of single-point positioning equipment and conventional RTK equipment on the position coordinate information of the distributed antenna is also solved.

This invention relates to a miniature dual-frequency microwave anechoic chamber based on spatially distributed ultrathin absorbing materials. It includes a rigid cylindrical shell mounted on a support. An ultrathin dual-frequency electromagnetic wave absorbing unit and a transmitting antenna are attached to the inner wall of the rigid cylindrical shell. The ultrathin dual-frequency electromagnetic wave absorbing unit and the transmitting antenna are integrally formed, and the transmitting antenna is a microstrip patch antenna. This invention, through research on spatially distributed ultrathin electromagnetic wave absorbing materials, realizes a wavelength-scale miniature dual-frequency microwave anechoic chamber. The shape and size of the microwave anechoic chamber can be customized according to actual application requirements, and it is expected to be widely used in antenna measurement, microwave imaging, and other fields. This invention features low cost, simple construction, and portability.

The invention provides an online adaptive radar rapid imaging method, and relates to the technical field of radar imaging, and the method comprises the steps: building an azimuth echo convolution model, and carrying out the restoration processing of an antenna measurement matrix, so as to reduce the imaging edge information error; recursive updating of local beams is realized based on independence of echo data in adjacent beam widths and structural characteristics of a repaired antenna measurement matrix; global beam recursion updating is realized through overlapping shift processing; and based on the optimal generalized ridge estimation theory, adaptively selecting regularization parameters, and completing target scene reconstruction. Compared with a traditional angle super-resolution method, the method has the advantages that the corresponding relation between the echo sample and the target grid is utilized, the inherent advantages of an online frame can be kept, and meanwhile the problem that the calculation redundancy of a traditional online method is too large is effectively solved.

The utility model provides a measuring circuit and a measuring device, relates to the technical field of antenna measurement, and can reduce the circuit cost and the circuit area of an antenna work parameter measuring circuit. The measuring circuit comprises an input end, an output end, a main measuring circuit, an auxiliary measuring circuit, a first resistor, a first triode, a first diode, a second triode and a switching circuit. The switching circuit is used for switching the conduction states of the first triode and the second triode. The input end is electrically connected with the main measuring circuit through the first resistor; the input end is also electrically connected with the auxiliary measuring circuit through a first triode; the output end is electrically connected with the main measuring circuit through the first diode; the output end is also electrically connected with the auxiliary measuring circuit through a second triode; the switching circuit is electrically connected with the first triode, the second triode and the main measuring circuit.

An antenna measurement system comprising tracks which typically removably engage e.g. clip onto the antenna, e.g. along at least one axis thereof; a probe which moves along the tracks; and software which derives calibration data characterizing the antenna using the probe, wherein, as the probe moves, the probe covers the antenna's entire surface.