4 results about "Antenna temperature" patented technology

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 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.

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.