9 results about "Antenna temperature" patented technology

The invention discloses a zero-balance Dick type radiation circuit and a radiometer, and is applied to the technical field of remote sensing measurement. Wherein the generation demodulation circuit detects and demodulates an initial temperature signal generated by the antenna according to an observed target; the feedback pulse generation circuit is used for carrying out feedback processing on the demodulation temperature signal sent by the demodulation circuit and generating a corresponding pulse frequency; the balance tracking module is used for tracking and filtering the pulse frequency sent by the feedback pulse generation circuit; the reference switch circuit is used for generating a diode noise temperature signal according to the tracking frequency sent by the balance tracking module and the diode temperature signal corresponding to the reference switch circuit so as to determine the antenna temperature and observation information based on the diode noise temperature signal. Therefore, according to the balance tracking module provided by the invention, the convergence speed and precision of the pulse frequency are improved, and the overall steady-state error is reduced, so that the relatively accurate antenna temperature and the observation information of the observed target are determined.

In an SAR phased-array antenna system, the temperature field distribution of an antenna array surface has important influence on the performance and stability of the system. The invention provides an SAR phased-array antenna temperature field distribution prediction method based on a random forest algorithm, and the method achieves the precise prediction of the antenna array surface temperature field distribution through the preprocessing, feature extraction and modeling of simulation and test data. According to the method, the temperature distribution of each single machine of the array plane at any moment can be predicted in real time according to actual working conditions, and technical support is provided for temperature field inconsistency compensation.

The utility model relates to the technical field of slurry concentration online detection, and particularly discloses a slurry concentration detection device which comprises a shielding shell, a radio frequency generator, a transmitting antenna, a receiving antenna, a temperature probe and a control system, a radio frequency controller in the control system controls a radio frequency generator to generate electromagnetic waves, so that a transmitting antenna transmits the electromagnetic waves to a receiving antenna, the receiving antenna can extend into slurry, the electromagnetic waves received by the receiving antenna are electromagnetic waves transmitted from the slurry, and the propagation rate of the electromagnetic waves in water and the concentration of the water are used as known quantities. The real-time slurry temperature measured by the temperature probe is combined, so that the concentration of the slurry measured in real time can be calculated, and nondestructive detection of the slurry concentration is realized; the concentration detection is not influenced by friction force of slurry contact, the antenna is not abraded and deformed, the concentration detection precision is improved, moving parts and quick-wear parts are not arranged, the failure rate is low, detection can be realized by installing the device on a slurry pipe, the device is convenient to install and use and low in energy consumption, and the production benefit is improved.

The application discloses a microwave transmitting antenna temperature uniformity optimization design method, and specifically comprises the following steps: step 1: by analyzing the structural characteristics of the transmitting antenna, extracting the structural parameters of the antenna heat dissipation system; step 2: determining the heat dissipation index used to describe the transmitting antenna temperature uniformity; step 3: performing the transmitting antenna heat dissipation system optimization modeling; step 4: performing the antenna finite element modeling and analysis, forming the orthogonal test results; step 5: based on the orthogonal test results, judging the primary and secondary factors, and determining the optimal design scheme. The microwave transmitting antenna temperature uniformity optimization design method reduces the simulation analysis times in the optimization design process to a great extent through reasonable design, avoids the mathematical sensitivity solution to a certain extent, saves the calculation cost, improves the calculation efficiency, and has certain practical significance.

This invention discloses a method, device, antenna, and storage medium for constant temperature control of a marine antenna. By inputting historical operating data of each execution unit of the marine antenna and historical ambient temperature outside the radome into the antenna temperature prediction model, a first temperature inside the radome and its confidence level are obtained when the temperature regulator is not activated in the next temperature control cycle. When the confidence level is greater than a confidence threshold, a temperature correction coefficient is determined based on the confidence levels of the first temperature predicted over multiple temperature control cycles to correct the first temperature and obtain a second temperature. In the next temperature control cycle, the temperature regulator is controlled to operate according to the second temperature and a preset target temperature to adjust the temperature inside the radome to the target temperature. This invention enables the prediction of the marine antenna temperature in the next temperature control cycle based on historical data and the correction of the predicted temperature. It allows for the advance determination of the temperature in the next temperature control cycle and timely temperature adjustment, keeping the radome in a constant temperature state and ensuring the performance of the marine antenna.

The invention belongs to the related technical field of microwave remote sensing, and discloses a method and equipment for removing stripe noise in brightness temperature observation of a satellite-borne microwave atmospheric detector based on heat source counting smoothing, and the method comprises the following steps: (1) carrying out the geographic positioning, radiation correction and antenna temperature correction of zero-order data, and then carrying out the calculation of the zero-order data; carrying out de-noising processing on the heat source count; wherein the zero-order data is obtained by preprocessing original detection data of a satellite-borne microwave atmospheric detector; and (2) calibrating the denoised heat source count and other data in the zero-order data to obtain brightness temperature data after stripe noise suppression so as to realize stripe noise removal. According to the method, the reason of stripe noise caused by noise fluctuation of the heat source count is known, smooth denoising processing is carried out on the heat source count based on the reason, the stripe noise in the observed brightness temperature is effectively inhibited, and the denoising effect and the brightness temperature data quality are improved.

The application provides a SAR satellite structure and a design method suitable for multi-satellite launching, relates to the technical field of spacecraft design, and comprises a satellite main body, a solar wing, a radiation unit, an antenna substrate, a through-plate connector, a TR assembly and a semi-rigid connecting assembly. The SAR satellite structure adopts a trapezoidal cross-section configuration, fully utilizes the internal space of a rocket fairing, improves satellite networking speed, sets heat conduction units and heating units between the radiation unit and the antenna substrate and between the antenna substrate and the TR assembly, increases heat conduction between single machines while ensuring the radiation array plane flatness of the radiation unit and the installation flatness of the TR assembly, improves antenna temperature consistency, the semi-rigid connecting assembly can reduce the antenna response in the active stage, release the antenna thermal deformation, reduce the flatness change, improve the radiation array precision, and solves the problems of low space utilization rate of the existing SAR satellite, the antenna flatness being easily affected by thermal deformation and the difficulty in antenna temperature control.

This invention provides a multifunctional modular antenna pointing controller. Its power module converts the satellite bus voltage into a secondary voltage; the control module receives antenna pointing control commands from the upper-level device via a first bus; each motor drive module independently drives the two-dimensional pointing mechanism of one antenna; a temperature acquisition and star sensor control module connects to the star sensor to obtain quaternion attitude information and collects antenna temperature telemetry information; and a thermal control drive module controls the heater's on / off state. Based on the antenna pointing control commands, the control module sends drive commands to the motor drive module via a second bus to control the deployment and positioning of each antenna in a time-division multiplexing manner; and calculates and drives the elimination of antenna pointing angle changes caused by changes in the overall satellite attitude based on the satellite orbit information, absolute star time, and quaternion attitude information. Thus, this invention achieves high-precision star sensor calibration for the first time, reducing cost and weight; it also boasts high integration and modular, customizable design.

The present invention discloses an on-orbit calibration method for the emissivity of a geostationary orbit microwave radiometer antenna, including: calculating the transmission equation of the antenna cascaded reflector according to the transmission equations of the three reflectors of the microwave radiometer antenna; obtaining the microwave loss equation of the antenna cascaded link according to the two-point calibration equation of the feed port surface and the transmission equation of the antenna cascaded reflector; using the antenna temperature control system to control the temperature gradients of the three reflectors of the antenna to the target values at the same time, and using the temperature control system to obtain the line-level cascaded losses corresponding to the temperature states of the two sets of antenna reflectors. Based on the microwave loss equation of the antenna cascaded link and the physical temperature corresponding spectral power density formula, calculate the relationship parameters between the surface reflectivity of the three reflectors of the antenna and the working surface temperature function. Realize the on-orbit real-time correction of the antenna self-radiation, conduct full cold sky observations on orbit by the microwave radiometer, and accurately obtain the antenna reflectivity and its function of changing with temperature.