12 results about "Earth satellite" patented technology

1. The name of the design product: Launch Vehicle (Chirei 6). 2. The use of the design product: used for space transportation, sending the payload such as artificial earth satellites, manned spacecraft, space stations or space probes into the predetermined space orbit. 3. The design points of the design product: the combination of shape, pattern and color. 4. The picture or photo that best shows the design points: perspective view. 5. The design claimed contains color.

The present application relates to the technical field of communication antenna, in particular to a kind of main bearing structure of satellite communication antenna on earth, including bearing seat, and the bearing seat is equipped with feed source component, further including the adjusting rod of rotation installation in the two sides of bearing seat, the outside rotation installation of adjusting rod is equipped with support part, and the lock unit for the locking of support part is installed on adjusting rod;And installation on the driving component of bearing seat, driving component is used to drive bearing seat to move;And the connecting portion of support part is matched with docking, connecting portion is connected with support part, the length of support part is extended, meet around the outside of rod, connecting piece is installed between two adjacent connecting portions, the support part of the present application is designed to cooperate with connecting portion, can be directly wound on the outside of rod body, and through driving component, drive bearing seat and feed source component to carry out corresponding lifting, to satisfy when the height of feed source component is improved by the way of climbing along the rod in lower terrain, to facilitate the acceptance of signal.

A ground antenna determines the current time and its own position from received signals that were transmitted by artificial earth satellites for communication. A high-gain multi-beam electrically-steered antenna is combined with a processing system to measure the angles between two or more satellites and determine the present distance to each satellite by the information broadcast on the TT&C channel. The knowledge of the angles and distances, as well as the trajectory of the satellites, can be combined with their locations as predicted by the satellite ephemeris data to triangulate the location of the receiver. This system is different from conventional GPS antennas because it does not require the cooperation of active communication with the satellites to derive a location estimate. The location is computed by the ground terminal, not by the satellite. This system can be used in cases where other locating services are offline, jammed, or otherwise unavailable to maintain location and time synchronization.

The application discloses a method for calibrating a roll angle of an emergency anti-solar time of a satellite on the earth, which is beneficial to reestablishing a three-axis attitude of the satellite on the earth. Firstly, an angle between a projection of a sun vector on an orbit plane and an orbit system-X axis is calculated; then, whether a current orbit position meets a requirement is determined according to the angle between the projection of the sun vector on the orbit plane and the orbit system-X axis, and whether an absolute attitude reference is available at present is determined, if the current orbit position meets the requirement and the absolute attitude reference is available at present, the roll angle is calibrated at a current control beat; otherwise, the roll angle is not calibrated at the current control beat; if the roll angle is calibrated at the current control beat, the roll angle is calculated based on the absolute attitude reference; if the roll angle is not calibrated at the current control beat, the roll angle is calculated by using gyro inertia angular velocity integration. The application can provide high-precision and reliable attitude information for reestablishing the attitude of the satellite on the earth.

A method for setting the RF operating frequency of an MRI system (1) uses a first reference frequency signal obtained from a geostationary satellite system as a stable long-term frequency reference. The first frequency reference signal is used to calibrate a second frequency source (24), which is then used as the master clock of the MRI system (1) for setting the RF operating frequency.

According to the method for applying the space-time positioning and the three-dimensional communication to the rail transit through the near-earth satellites, the positioning precision is improved and the initial positioning time is shortened by transmitting navigation enhancement information through a near-earth satellite constellation communication navigation time service function or a transmission channel, or / and the navigation signal strength is enhanced through the positioning satellite function of the near-earth satellites, and the positioning accuracy is improved. Reliable train-ground communication, train-train communication, train head-tail communication, trackside equipment and stations and inter-station communication of a train in a satellite communication section are achieved by providing a switching method between near-earth satellite constellation satellites or wave beams, and the satellite communication section can be obtained through train positioning or prompted by a ground transponder through marking in line data by dividing the satellite communication section. Switching between a satellite communication section and other communication sections can be realized, and the transportation efficiency is improved.

1. Name of the product in this design: Launch Vehicle (Chitu 6A). 2. Purpose of this design: For use in space transportation vehicles to send payloads such as artificial Earth satellites, manned spacecraft, space stations, or space probes into predetermined space orbits. 3. The key design elements of this product are the combination of shape, pattern, and color. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The design for which protection is sought includes color.

Dynamic access control of at least one communication terminal to the satellite communication resources of a low-Earth satellite constellation. The present invention relates to a method (36) for dynamically controlling access of a terminal to the satellite resources of a low-Earth satellite constellation, comprising the following steps, for a predetermined mission: - prior geolocated planning (38) of the allocation partition of all satellite resources according to a geolocated need associated with said mission, and the predetermined path of each satellite; - dynamic access control (44) of said terminal to said satellite resources by applying, at each predetermined time of said mission, the following substeps: - identification and location (48) of said terminal; - determination (50) of the nature of the service required from said terminal;- routing of said terminal to a piece of said partition according to said identification, said location and said nature of service. Figure for the abbreviation: Figure 2;

The utility model provides a near-earth satellite-borne phased array signal processing system (short for 5G NR-NTN), comprising a front-end 5G signal transceiving system connected through a high-speed FMC interface (short for O-RU); the data front-end processing system is connected with the front-end 5G signal transceiving system through the high-speed FMC interface (O-DU for short); the data co-processing system is connected with the data front-end processing system (called O-CU for short) through a high-speed XMC connector; wherein the front-end 5G signal receiving and transmitting system is used for receiving and transmitting 5G signals, the data front-end processing system is used for processing the signals, the data co-processing system is used for exchanging data, and the front-end 5G signal receiving and transmitting system, the data front-end processing system and the data co-processing system form an integrated signal processing module. According to the utility model, a high-performance CX8242 chip is adopted as the core of a front-end 5G signal transceiving system, and the ADC and DAC with high sampling rate and high resolution and the ADCFB with low noise are combined, so that the precision and efficiency of signal processing are effectively improved.

The invention discloses an agile earth satellite scheduling method based on multi-target neural strategy optimization, and the method comprises the steps: constructing a target model corresponding to a multi-target agile earth observation satellite scheduling problem, and enabling the target model to maximize the total observation income of a scheduling plan and maximize the average image quality of the scheduling plan as two optimization targets; a multi-target optimization strategy based on decomposition is adopted, a multi-target agile earth observation satellite scheduling problem is decomposed into a plurality of single-target optimization sub-problems, and each sub-problem corresponds to an optimization direction vector; constructing a scheduling sequence based on a Markov decision process, solving each single-target optimization sub-problem by using a neural network model of an encoder-decoder structure, and generating a scheduling sequence corresponding to each sub-problem; and combining the solutions of all single-target optimization sub-problems, and generating a Pareto frontier of the multi-target agile earth observation satellite scheduling problem through non-dominated sorting as a final satellite scheduling scheme.

The invention discloses a moon shadow time calculation method based on an SGP4 model, and relates to the technical field of spacecraft orbit dynamics and energy management.The moon shadow time calculation method comprises the steps that a closed feedback loop is formed by extending a Kalman filter state variable and taking the instantaneous noise offset of an atmospheric resistance parameter B * as an independent estimation target; orbital perturbation changes caused by sun activity peaks, sudden geomagnetic disturbance and the like can be tracked in real time, and the stability of penumbra entering and exiting time of the near-earth satellite is remarkably improved; in order to solve the problem of frequent switching of shadow intervals of high-orbit satellites, a time period merging strategy based on an error ellipsoid and shadow area overlapping probability is provided. By quantizing the contribution of the position uncertainty to the shadow state, a pseudo switching event generated by model jitter is filtered out, a continuous shadow time period conforming to engineering practice is output, and invalid operation of an energy system is reduced.

The application discloses a method for estimating the safety communication rate of a near-earth satellite by using SDFS in cooperation with GLRT, and comprises the following steps: constructing a communication system model between the near-earth satellite and a ground terminal; analyzing signal and channel characteristics to obtain the distance between nodes, channel gain and received signal distribution; in the case that the transmission power of each monitoring party is unknown, generalized likelihood ratio test is used to estimate the transmission power, and the generalized likelihood ratio test is independently executed based on the observation data of each monitoring party; a superior manager performs joint decision based on a soft decision fusion scheme, in combination with the generalized likelihood ratio test result of each monitoring party and a joint threshold, to estimate the detection error probability of the monitoring party; a joint optimization strategy of transmission power and the number of continuous transmission time slots is constructed, and the total system throughput is maximized under the condition of meeting the cooperative concealment constraint; and the application provides an innovative solution for reliable communication of the near-earth satellite in a complex monitoring environment.