10 results about "Radiation pressure" patented technology

The present application relates to the technical field of machine vision, and discloses a kind of multi-band image end-to-end multi-task intelligent detection method, by obtaining multi-band target image, the feature fusion is carried out to multi-band target image, three-layer feature extraction is carried out to the image after fusion, can more fully capture image information, reduce the low infrared feature influence caused by cloud layer radiation suppression or submersion target, while reducing the false alarm caused by the target-like radiation source in the edge of cloud layer and ground object background, reduce the false detection and missed detection of weak and small target identification tracking, combined with target detection head, key point detection head and situation classification detection head, each detection head independent branch decoupling task, improve the generalization ability and detection efficiency of model.

The invention discloses an atmospheric particulate micro-fluidic system based on a light chromatography sorting chip and a sorting method, and belongs to the technical field of micro-fluidic analysis. The system comprises a liquid inlet injection control unit, a micro-fluidic chip function unit, a laser control unit and an observation unit. The liquid inlet injection control unit adopts an SPM injection pump system, and the flow speed can be independently and accurately adjusted through multiple channels; the micro-fluidic chip functional unit is used for sorting particulate matters by utilizing particle size difference; the laser control unit can accurately control the light radiation force intensity; the observation unit can dynamically monitor and obtain high-quality images, atmospheric particulates are sorted and collected based on the system, a sample solution is introduced into a chip, a laser is started, sorting is achieved according to comparison of light radiation pressure of the particulates and fluid resistance, and meanwhile particle movement is captured through a CCD camera. The system breaks through the bottleneck of the traditional technology through multi-unit cooperation, realizes non-contact and high-precision sorting, can also monitor and analyze the sorting process in all directions, and provides support for air pollution prevention and control.

The application discloses a low-orbit satellite solar radiation pressure model construction method, device and equipment, and relates to the technical field of satellite navigation and positioning. In the method, a carrier phase and an accelerometer are used to calculate the perturbation force total acceleration of a low-orbit satellite. The environmental state information of the low-orbit satellite is collected, and the solar radiation pressure acceleration is obtained in combination with the perturbation force total acceleration. Based on the initial radiation coefficient used in the initial low-orbit satellite solar radiation pressure model, the corrected radiation coefficient is obtained in combination with the solar radiation pressure acceleration. The low-orbit satellite solar radiation pressure model of the first correction period is constructed by using the corrected radiation coefficient. In this way, the measured data collected by the on-board carrier phase and the accelerometer is used to calculate the perturbation force total acceleration of the low-orbit satellite, and the corrected radiation coefficient is obtained based on the least square estimation to finely construct the low-orbit satellite solar radiation pressure model, thereby avoiding the serious dependence of the light pressure model of the low-orbit satellite on the prior information parameters in the orbit operation.

This invention discloses a method and system for orbit determination of BeiDou satellites by compensating for solar radiation pressure using a deep learning network. Addressing the problem of limited orbit determination accuracy due to inaccurate estimation of solar radiation pressure parameters under regional observation networks, this invention acquires raw satellite observation data and space weather data to construct a dataset containing features such as satellite position, velocity, acceleration, attitude, solar altitude angle, and geomagnetic index. A gradient boosting tree algorithm is used to filter key features; a Transformer network containing only the encoder is used to predict radiation pressure acceleration errors; a virtual observation equation is constructed based on the prediction error and jointly solved with the GNSS observation equation to constrain ECOM radiation pressure parameter estimation; and residual detection is introduced to eliminate outlier predicted values. This invention significantly improves the orbit determination accuracy of BeiDou satellites under regional station networks without requiring additional hardware, and exhibits stable performance across different regions and with different numbers of stations.

The adjusting device (500) sets M to a predetermined integer satisfying 3 ≤ M, and simultaneously irradiates the atomic beam (131) with M lasers. The respective traveling paths of the M lasers intersect the traveling path of the atomic beam (131). The component in the direction perpendicular to the traveling path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is zero. The component in the direction of the traveling path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is negative with respect to an atom having a speed greater than a prescribed speed, and is positive with respect to the atom having a speed smaller than the prescribed speed.

The adjusting device (500) sets M to a predetermined integer satisfying 3 ≤ M, and simultaneously irradiates the atomic beam (131) with M lasers. The respective traveling paths of the M lasers cross the entry path of the atomic beam (131). The component in the direction perpendicular to the entry path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is nonzero. The component in the direction of the entry path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is negative with respect to an atom having a speed greater than a prescribed speed and is positive with respect to the atom having a speed less than the prescribed speed.

This invention relates to the field of microelectromechanical systems (MEMS) sensor technology, and discloses an all-SiC high-temperature radiation-resistant piezoresistive pressure sensor chip and its fabrication method. The chip includes an upper structure, a sensitive layer structure, and a lower structure, which are stacked sequentially and connected by bonding to form a whole, creating a sealed chamber. The sensitive layer structure includes a central connecting block and four sensitive beams symmetrically arranged around it. The central connecting block has a through-hole penetrating its upper and lower surfaces, forming a docking slot. Each sensitive beam integrates a Wheatstone bridge. Both the upper and lower structures have a reduction film corresponding to the position of the central connecting block, and an alignment block is located on the side of the reduction film facing the sensitive layer structure. The alignment blocks of the upper and lower structures are inserted into the docking slots from their respective upper and lower sides. The unique orthogonal directional differential resistance design within the single bridge of this invention greatly improves sensitivity.

Herein is presented an optical solar sail system attached to a space vehicle acted on by solar radiation emanating in a solar radiation vector comprises: (i) at least one functional surface comprising a designated sheet; (ii) a first controller configured to control the sail's transmission of solar radiation; (iii) a second controller configured to control the satellite orbit and attitude of the space vehicle; and (iv) an energy source in communication with the first controller, wherein the designated sheet of the at least one functional surface is configured to selectively transmit or reflect solar radiation and wherein said the control of said selectivity is configured to enable the at least one functional surface to control the forces resultant from solar radiation pressure acting on at least one space vehicle.

The invention discloses a low earth orbit satellite orbit forecasting method and device based on Doppler dynamic constraint, and belongs to the technical field of spaceflight measurement and control and satellite navigation. According to the method, bidirectional coherent Doppler observation data are obtained through an inter-satellite laser link, and a Doppler dynamic constraint mechanism is constructed in combination with GNSS precise orbit determination information, so that high-precision prediction of a low-orbit satellite orbit is realized. The method comprises the following steps: adaptively adjusting a process noise matrix and dynamically correcting modeling errors of non-conservative forces such as atmospheric resistance and solar radiation pressure by using the energy change of a Doppler observation residual error in a tangential sensitive frequency band; when the GNSS signal is weak or lost, stable and reliable orbit constraint can still be provided; and outputting the orbit state and uncertainty evaluation in the future 30-120 minutes through filtering updating and dynamic extrapolation. According to the method, the precision and robustness of orbit forecasting are remarkably improved, and the method is suitable for low-orbit satellite task scheduling and safety management and control.

The application discloses a kind of low-orbit satellite orbit prediction method and device based on Doppler dynamic constraint, belong to spaceflight measurement and control and satellite navigation technical field.The method obtains two-way coherent Doppler observation data by inter-satellite laser link, combined with GNSS precise orbit determination information, constructs Doppler dynamic constraint mechanism, realizes high-precision prediction to low-orbit satellite orbit.Core includes: using the energy change of Doppler observation residual in tangential sensitive band, self-adapting adjustment process noise matrix, dynamically revising the modeling error of non-conservative force such as atmospheric resistance and solar radiation pressure;When GNSS signal is weak or lost, still can provide stable and reliable orbit constraint;By filtering update and dynamics extrapolation, the orbit state and uncertainty evaluation of future 30-120 minutes are output.The application significantly improves the precision and robustness of orbit prediction, and is suitable for low-orbit satellite task scheduling and safety control.