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30 results about "Celestial coordinate system" patented technology
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In astronomy, a celestial coordinate system (or celestial reference system) is a system for specifying positions of satellites, planets, stars, galaxies, and other celestial objects. Coordinate systems can specify an object's position in three-dimensional space or plot merely its direction on a celestial sphere, if the object's distance is unknown or trivial.
Simulation system and simulation method for three-dimensional comprehensive situations of space mission
InactiveCN102567586ARealize interactive simulationImprove viewing effectSpecial data processing applications3D modellingSystems managementTime management
The invention discloses a simulation system and a simulation method for three-dimensional comprehensive situations of a space mission. The simulation system comprises a space satellite trail and posture modeling module, a satellite frame modeling module, a coverage area analysis and modeling module, a data tracking and receiving modeling module, a time management module, a coordinate system management module and a three-dimensional visualizing simulation module, wherein the time management module is used for providing simulation time and various time standards of astronomical time for simulation of the space mission; the coordinate system management module is used for providing various coordinate systems such as a celestial coordinate system, an earth fixed connection coordinate system, a moving coordinate system and the like to describe moving rules of moving objects; and the three-dimensional visualizing simulation module is used for three-dimensional visual display, playback and deduction for situation analysis and modeling results, capable of controlling acceleration, deceleration, pause and start of a simulation process according to the simulation mission or a demonstration script, and capable of providing a powerful guarantee for display of the space comprehensive situations and analysis and demonstration of a focused simulation stage.
Owner:THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Self-aligning telescope
ActiveUS20060238860A1Quickly and accurately orientImprove accuracyPhotometry using reference valueInstruments for comonautical navigationSkyCelestial body
Embodiments of the present disclosure include self-aligning telescope control systems and self-alignment methods. In an embodiment, a telescope control system orients a telescope with respect to the celestial sphere by pointing the telescope in the direction of an alignment star or alignment area of the sky. The telescope control system images a field of view in the alignment area, and processes the images to determine the celestial coordinates of a center of the filed a field of view the alignment area. The telescope control system then maps the telescope's coordinate system to the celestial coordinate system. Once mapped, the telescope control system can advantageously slew the telescope to any desired celestial object in the viewable sky based on, for example, user selection, system recommendations, combinations of the same, or the like.
Owner:MEADE INSTRUMENTS
Self-aligning telescope
ActiveUS7339731B2Quickly and accurately orientImprove accuracyPhotometry using reference valueInstruments for comonautical navigationSkyCelestial body
Embodiments of the present disclosure include self-aligning telescope control systems and self-alignment methods. In an embodiment, a telescope control system orients a telescope with respect to the celestial sphere by pointing the telescope in the direction of an alignment star or alignment area of the sky. The telescope control system images a field of view in the alignment area, and processes the images to determine the celestial coordinates of a center of the filed a field of view the alignment area. The telescope control system then maps the telescope's coordinate system to the celestial coordinate system. Once mapped, the telescope control system can advantageously slew the telescope to any desired celestial object in the viewable sky based on, for example, user selection, system recommendations, combinations of the same, or the like.
Owner:MEADE INSTRUMENTS
Systems and methods for automated telescope alignment and orientation
A fully automated telescope system is operable in both alt-az and equatorial modes. In either configuration, the telescope system aligns and orients itself to the celestial coordinate system following a simplified initialization procedure during which the telescope tube is first pointed North and then pointed towards the horizon. A command processor, under application software control, orients the telescope system with respect to the celestial coordinate system given the initial directional inputs. The initial telescope orientation is refined by automatically inputting geographical location data and a timing parameter. A simplified tracking procedure allows tracking of celestial objects after the telescope system has had its axis positions initialized to a horizontal and a vertical index. Object tracking is subsequently performed with no additional orientation procedure required.
Owner:MEADE INSTRUMENTS
Wave water surface sky diffuse reflection light polarization field simulation method
InactiveCN103940515AIn line with the actual situation of natureImprove universalityLight polarisation measurementRayleigh scatteringDiffuse reflection
The invention relates to a wave water surface sky diffuse reflection light polarization field simulation method. The method has the following steps: a celestial coordinate system describing a sky light polarization field is established; sun point location and observation point location are designed in the celestial coordinate system; a sky light scattering angle is calculated in spherical geometry; degree of polarization of sky light at any point is calculated according to a semi-analytical Rayleigh scattering model; a polarization angle of sky light is calculated according to the sun point location and sky observation point coordinates via a vector mode; the polarized reflectance and the degree of polarization of wave water surface sky diffused light are calculated; and the polarization angle of water surface reflected sky light is obtained according to information of sky light degree of polarization in combination with an STOKES vector and a trigonometric function relationship so that calculation of the polarization state of water surface reflected sky light is realized. Sky light can be incident at any polarization state, and the polarization state of the reflected light of a static water surface and the wave water surface can be realized so that polarization characteristics of a natural water surface can be really described.
Owner:BEIHANG UNIV
Sun vector resolving method based on underwater polarization distribution mode
ActiveCN111220150AAngle measurementNavigation by astronomical meansRayleigh scatteringRayleigh Light Scattering
The invention relates to a sun vector resolving method based on an underwater polarization distribution mode. The method comprises the steps of firstly, obtaining the underwater polarization azimuth angle information in at least two arbitrary observation directions under an underwater celestial coordinate system; then, inverting the propagation direction of the atmospheric incident light in the underwater observation direction based on the law of light refraction; determining an atmospheric polarization E-vector corresponding to a polarization E-vector observed underwater by using a Fresnel refraction formula; and finally, according to a Rayleigh scattering model, obtaining a solar vector by utilizing the vertical relationship between the atmospheric polarization E-vector and the solar vector. According to the invention, the sun vector calculation basic model based on the polarization distribution mode in an underwater Snell window under the horizontal attitude is established, and themethod can be popularized and applied to the underwater application scenes of point source type and image type polarization sensors.
Owner:BEIHANG UNIV
Low-earth-orbit satellite long-term orbit prediction method based on two line element
PendingCN110595485AHigh solution accuracyReduce computationInstruments for comonautical navigationSustainable transportationAngular velocityOrbit prediction
The invention relates to a low-earth-orbit satellite long-term orbit prediction method based on a two line element. The method comprises the following steps: performing related processing on a two line element in an orbital coordiante system at a moment t, thus obtaining a satellite orbital element initial value applicable to an orbit prediction dynamical model in a J2000.0 geocentric celestial coordinate system; and solving the orbit prediction dynamical model by adopting a numerical method, thus obtaining a satellite orbital element prediction result, wherein the related processing comprisesreduction processing performed on angular velocity of peace movement in the two line element, conversion of a mean element into an instant element in the orbital coordinate system at the moment t andconversion of the instant element in the orbital coordinate system at the moment t into an instant element in the J2000.0 geocentric celestial coordinate system. The low-earth-orbit satellite long-term orbit prediction method based on the two line element is high in prediction precision.
Owner:SHANGHAI AEROSPACE ELECTRONICS CO LTD +1
Alignment system for observation instruments
A method and apparatus is disclosed for aligning an optical instrument with respect to a celestial coordinate system, the optical instrument having a field of view and an optical instrument coordinate system, the celestial coordinate system having a plurality of objects each having celestial coordinates. The method includes the steps of receiving a plurality of captured optical instrument positions in the optical instrument coordinate system along with a plurality of associated capture times; calculating, for each associated capture time in the plurality of associated capture times, coordinates in the optical instrument coordinate system for the plurality of objects to create a plurality of calculated object positions for each associated capture time; and, determining, for each associated capture time, a match for each captured optical instrument position in the plurality of captured optical instrument positions with the plurality of calculated object positions to create a list of actual alignment objects.
Owner:CELESTRON ACQUISITION
Whole-space information system-oriented coordinate system conversion method
InactiveCN107885546AImprove accuracyImprove reliabilityProgram loading/initiatingGeographical information databasesPhysical spaceSpatial information systems
The invention provides a whole-space information system-oriented coordinate system conversion method, and belongs to the field of geospatial information visualization. A space conversion framework ofa whole-space information system is established, and description of WKT on a space reference system is extended to enable the same to support definition of planets and coordinate systems of celestial-sphere coordinate systems, orbit coordinate systems and the like; and a space reference memory model based on a nine-degree-of-freedom space reference tree is designed, and thus maintenance of the space reference tree, calculation of relative status and plug-in realization of the coordinate system conversion method are realized. The method can effectively solve continuous whole-space-time modelingand simulation of the whole-space information system from macroscopic worlds (such as stars and planets in a solar system) to microcosmic worlds (such as indoor environments), from static status to dynamic status and from physical space-time to logical space-time, has good scalability and realization efficiency, and can be widely applied to many fields of satellite positioning and navigation, aerospace remote-sensing, smart cities, territorial planning, military application and the like.
Owner:ZHENGZHOU NORMAL UNIV
Roller shutter exposure star sensor star point position correction method based on average speed
ActiveCN111412915AImprove attitude measurement accuracySmall amount of calculationNavigation by astronomical meansAngular distanceCelestial sphere
The invention discloses a roller shutter exposure star sensor star point position correction method based on average speed, which comprises the following steps of 1) according to two continuous framesof star maps (a qth frame and a (q + 1)th frame), obtaining the star point centroid position and the average speed of the star point moving along the horizontal and vertical directions in the (q + 1)th frame of star map, 2) taking the kth row of exposure time of the (q + 1)th frame of image as a reference, and obtaining the corrected star point position in the (q + 1)th frame of star map, 3) resolving the angular distance measured value between the star points after correction, comparing the angular distance measured value with the angular distance theoretical value under a celestial coordinate system, and verifying the correctness of the star point position after correction in the step 2) according to the angular distance error, and 4) according to the corrected star point centroid coordinates solved in the step 2) and the verification conclusion in the step 3), resolving to obtain the star sensor attitude corresponding to the kth row exposure moment of the (q + 1)th frame of image.According to the method, the position correction relation is established based on the line exposure moment and the star point average movement speed in the roller shutter exposure star map, and the attitude measurement precision of the star sensor in the roller shutter exposure mode under the star point movement condition is improved.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Novel great-circle celestial coordinate system with six regions
InactiveCN102568300AReduce computational complexityEvenly dividedPlanetaria/globesNatural satelliteEarth's rotation
The invention provides a novel great-circle celestial coordinate system with six regions, which belongs to the field of astronomy basic theories. The building of a traditional celestial coordinate system is related to theories of earth rotation, south and north poles and parallel circles, wherein the parallel circles are small circles, and the problems that longitude in polar regions is difficult to distinguish and a celestial sphere is divided non-uniformly as a longitude plotting scale deforms along with latitude. According to the novel great-circle celestial coordinate system with the six regions, the celestial sphere is divided into six identical regions, each novel coordinate is constructed by a great circle completely, the coordinate relations between each region and an equatorial system of coordinate as well as each region and a space rectangular coordinate are deduced, and formulas of the relation are concise. The novel great-circle celestial coordinate system is defined intuitively, treats six celestial sphere regions equally, can not be influenced by the south and north poles and the parallel circles, is more uniform in region division, does not increase calculation complexity of coordinate conversion, and is suitable for popularization. With the devolvement of the south and north poles and the satellite orbit design, in particular to constant expanding of the deep space exploration filed, the novel coordinate system has potential application value.
Owner:BEIHANG UNIV
Single factor atmospheric polarization modeling method based on Rayleigh scattering
InactiveCN101532881AImprove accuracyImprove acceleration performanceLight polarisation measurementRayleigh scatteringElectric intensity
The invention provides a single factor atmospheric polarization modeling method based on Rayleigh scattering, comprising the following steps: selecting the observation point and establishing a celestial coordinate system and obtaining the current time sun position using the observation time and observation point geographic coordinate; selecting any point to be measured on the celestial sphere surface and solely determining a northeast coordinate system based on the current time sun position using the point to be measured as the coordinate origin; in the northeast coordinate system, decomposing the incidence natural light into two beams of linearly polarized light in same intensity, vertical electric-field vibration direction, no fixed phase relation, and computing the scattered light electric field strength component under linearly polarized light incidence. The method uses the electric intensity vector to describe light wave and uses the vector size of the scattered light electric field strength component to obtain the polarization degree of the point to be measured and uses the vector direction of the scattered light electric field strength component to obtain the polarization direction of the point to be measured, thus the distributed model of the all-day atmospheric polarization information is obtained and the accuracy and the expansibility of the atmospheric polarization model is increased.
Owner:HEFEI UNIV OF TECH
System and method for automatically aligning a telescope without requiring user intervention
ActiveUS8477419B1Replacement is neededAvoid the needAngle measurementUsing optical meansCelestial bodyTelescope
According to various embodiments, a telescope is automatically aligned without requiring user intervention and without requiring knowledge of actual local time or location. A mount model specifying a relationship between a telescope's internal coordinate system and a celestial coordinate system is generated using an arbitrary time, arbitrary telescope location, and a number of alignment reference points. A pointing error for the initial mount model is determined, for example using a plate solving technique to translate between plate coordinates and celestial coordinates for the alignment reference points. Time and location values are iteratively adjusted to reduce the pointing error until it is acceptably low. In one embodiment, adjustments are made by reference to a local sidereal time (LST) offset and / or a latitude value. In one embodiment, the iterative adjustment is performed using a two-phase methodology, including a coarse adjustment followed by a fine adjustment.
Owner:CELESTRON ACQUISITION
CUDA-based (compute unified device architecture-based) giant constellation coverage performance parallel computing method
ActiveCN114580181AQuick calculationImprove Simulation EfficiencyDesign optimisation/simulationHigh level techniquesComputational scienceConcurrent computation
The invention discloses a CUDA (Compute Unified Device Architecture)-based giant constellation coverage performance parallel computing method. The method comprises the following steps: (1) setting initial parameters of a constellation; (2) setting coverage performance calculation conditions; (3) pre-allocating a memory for ephemeris data in the GPU according to the initial parameters of the constellation; (4) pre-allocating a memory for a coverage calculation intermediate variable and a final calculation result in the GPU according to an initial parameter of the constellation and a coverage performance calculation condition; (5) performing orbit forecasting on the constellation; (6) coordinate conversion: converting a satellite ephemeris from a geocentric celestial coordinate system to an earth-fixed system; (7) copying ephemeris data from the CPU to the GPU; (8) performing coverage performance calculation in the GPU according to a given coverage performance calculation condition; and (9) copying a calculation result from the GPU to the CPU for output. According to the method, rapid calculation of the coverage performance of the giant constellation is realized, the simulation efficiency is greatly improved, and the method is operated on a Jetson series embedded development board and is applied to a satellite platform carrying a satellite-borne embedded GPU system.
Owner:NANJING UNIV
Attitude determination method based on double short baselines of navigation satellite signals
Owner:中国人民解放军63620部队
A Sun Vector Calculation Method Based on Underwater Polarization Distribution Mode
ActiveCN111220150BAngle measurementNavigation by astronomical meansRayleigh scatteringRayleigh Light Scattering
The invention relates to a solar vector calculation method based on an underwater polarization distribution mode. First, obtain the underwater polarization azimuth angle information in at least two arbitrary observation directions in the underwater celestial coordinate system; then, based on the law of light refraction, invert the propagation direction of the atmospheric incident light in the underwater observation direction; then use the Fresnel refraction formula Determine the atmospheric polarization E-vector corresponding to the polarization E-vector observed underwater; finally, according to the Rayleigh scattering model, use the vertical relationship between the atmospheric polarization E-vector and the sun vector to obtain the sun vector. The invention establishes a basic sun vector calculation model based on the polarization distribution mode in the underwater Snell window under the horizontal posture, and can be popularized and applied to underwater application scenarios of point source type and image type polarization sensors.
Owner:BEIHANG UNIV
Facilitating the more natural aiming of telescopes
The illustrative embodiments provide for a computer implemented method, computer readable medium, and data processing system for adjusting a perceived image seen through an optical observation device. The azimuth-elevation-rotation of the optical observation device is measured relative to an observer. The field of view observed through the observation device appears with at least one of rotated and inverted optical translation relative to observation of the object with an unaided eye of the observer. Based on the celestial coordinate system inherent in the design of the mounting of the optical observation device, moving optical observation device in the optical translation direction, wherein the field of view moves in the optical view direction, and wherein the celestial coordinate system is selected from a group consisting of an equatorial coordinate system and an azimuth-elevation coordinate system.
Owner:IBM CORP
Heavenly body sensor measuring reference transform method and apparatus thereof
InactiveCN100504301CSimplify the installation processEasy to operateInstruments for comonautical navigationOptical axisBody sensors
Owner:BEIHANG UNIV
A target angular velocity calculation method and device based on a photoelectric turret
ActiveCN111649743BLow costSimple calculationNavigational calculation instrumentsOptical axisQuaternion
A method and device for calculating target angular velocity based on a photoelectric turret, the method comprising: step 1, calculating the Euler angle of the target in the photoelectric turret coordinate system; step 2, based on the Euler angle of the target in the photoelectric turret coordinate system Angle, calculate the quaternion and attitude, and calculate the Euler angle of the target in the northeast sky coordinate system; step 3, calculate the target’s Euler angle in the northeast sky coordinate system based on the Euler angle of the target in the northeast sky coordinate system Euler angular velocity; step 4, based on the Euler angular velocity of the target in the northeast sky coordinate system, calculate the Euler angular velocity of the target in the photoelectric optical axis coordinate system; step 5, obtain the Euler angular velocity of the target in the photoelectric optical axis coordinate system The angular velocity is converted to the photoelectric turret coordinate system, so as to obtain the Euler angular velocity of the target in the photoelectric turret coordinate system. The present invention can also calculate the target angular velocity when there is no target distance information.
Owner:WUHAN GUIDE INFRARED CO LTD +1
Method for calculating coordinates of intersection point D of optical axis and celestial surface based on star sensor
InactiveCN111521173APrecise navigation and positioningAchieve high-precision attitude measurementInstruments for comonautical navigationNavigation by astronomical meansFixed starsOptical axis
The invention relates to a method for calculating coordinates of an intersection point D of an optical axis and a celestial surface based on a star sensor. The method comprises the steps of establishing a space rectangular coordinate system under a celestial coordinate system, performing translation or rotation transformation on the space rectangular coordinate system to enable the space rectangular coordinate system to coincide with a star sensor coordinate system to obtain a transformation relationship between the two coordinate systems, and representing a coordinate expression of the pointD in the celestial coordinate system by using each parameter; obtaining the relationship among the coordinates according to the cosine law, and obtaining an approximate expression of the distance f from the projection center to the projection point on the star sensor light-sensitive surface by using a Taylor expansion formula; substituting the approximate expression into the coordinate expressionof the point D in the celestial coordinate system to obtain a celestial coordinate approximate value expression of the point D; performing error analysis in combination with a median theorem, and obtaining a fixed star selection standard to further improve the coordinate precision of the point D. The invention aims to establish a mathematical model, solve the coordinates of the intersection pointD of the optical axis and the celestial surface, enables coordinates of the point D to be accurate through an optimization algorithm, and improve the attitude measurement precision of the star sensor.
Owner:HUBEI UNIV
A method for calculating the d-coordinate of the intersection of the optical axis and the celestial sphere based on a star sensor
InactiveCN111521173BPrecise navigation and positioningAchieve high-precision attitude measurementInstruments for comonautical navigationNavigation by astronomical meansFixed starsOptical axis
The invention relates to a method for calculating coordinates of an intersection point D of an optical axis and a celestial surface based on a star sensor. The method comprises the steps of establishing a space rectangular coordinate system under a celestial coordinate system, performing translation or rotation transformation on the space rectangular coordinate system to enable the space rectangular coordinate system to coincide with a star sensor coordinate system to obtain a transformation relationship between the two coordinate systems, and representing a coordinate expression of the pointD in the celestial coordinate system by using each parameter; obtaining the relationship among the coordinates according to the cosine law, and obtaining an approximate expression of the distance f from the projection center to the projection point on the star sensor light-sensitive surface by using a Taylor expansion formula; substituting the approximate expression into the coordinate expressionof the point D in the celestial coordinate system to obtain a celestial coordinate approximate value expression of the point D; performing error analysis in combination with a median theorem, and obtaining a fixed star selection standard to further improve the coordinate precision of the point D. The invention aims to establish a mathematical model, solve the coordinates of the intersection pointD of the optical axis and the celestial surface, enables coordinates of the point D to be accurate through an optimization algorithm, and improve the attitude measurement precision of the star sensor.
Owner:HUBEI UNIV
Method and device for automatically searching and tracking astronomical target by astronomical telescope
ActiveCN113360735AAchieving autonomous alignmentImplement automatic trackingImage enhancementDigital data information retrievalFeature extractionInteraction device
The invention discloses a method and device for automatically searching and tracking an astronomical target by an astronomical telescope, and the method comprises the steps: S1, obtaining a preset astronomical target, obtaining the direction of the astronomical target in a celestial coordinate system from a database of a man-machine interaction device, and recording the direction of the astronomical target in the celestial coordinate system as a first direction; S2, acquiring an astronomical image in real time, performing feature extraction on the astronomical image, and identifying a feature extraction result; S3, calculating the direction of the astronomical telescope in the celestial coordinate system in real time according to the recognition result, and recording the direction of the astronomical telescope in the celestial coordinate system as a second direction; S4, comparing the first direction with the second direction; and S5, when the first direction is inconsistent with the second direction, adjusting a servo device, and repeatedly executing the steps S2-S4 until the first direction is consistent with the second direction. In this way, the astronomical target can be automatically aligned and automatically tracked.
Owner:深圳市魔方卫星科技有限公司
Multi-view-field starry sky observation satellite target attitude planning method
PendingCN114061594AGuaranteed validityImprove the quality of observationInstruments for comonautical navigationPhotogrammetry/videogrammetryFixed starsObservation point
The invention relates to a multi-view-field starry sky observation satellite target attitude planning method, which comprises the following steps of: 1, acquiring seasons or months of starry sky observation of a satellite, a satellite orbit height and a stray light suppression angle of imaging optical equipment; 2, according to the projection relation between the selectable view field and the observable sky area of the optical equipment, providing the selectable sky area of each piece of optical equipment; 3, selecting an observation point set according to the distribution of fixed stars in the selectable sky area, obtaining the direction of each optical device under the observation point under the celestial coordinate system, judging whether the optical device is in the available sky area, and deleting unavailable observation points; 4, counting the number of fixed stars in the field of view of the camera under the available observation points, and optimizing the available observation points; and 5, repeating the steps 3 and 4 until a satisfactory observation point set is found, and outputting the right ascension and declination of the optimal observation point and a satellite attitude conversion matrix. According to the invention, ideal observation sky areas and target attitudes are provided for multi-view-field star sky imaging of remote sensing satellites and astronomical observation satellites.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY
An orbit design method near the translation point of the Earth-Moon triangle
ActiveCN113627029BHigh precisionEasy to call directlySustainable transportationDesign optimisation/simulationComputational physicsEphemeris
The invention discloses an orbit design method near the triangular translation point of the Earth and Moon, comprising the following steps: (1) constructing the semi-analytical solution approximation of the motion near the triangular translation points L4 and L5 under the ephemeris model; (2) designing Under the ephemeris model, the mission orbits of the earth-moon triangular translation points L4 and L5 are maintained for a certain period of time; (3) the output orbit design results, that is, the detectors in the earth-centered celestial coordinate system and the earth-moon instantaneous meeting coordinate system are generated at certain time intervals position and velocity vector. The invention can start to design and maintain the task orbit for a long time from any moment, the adopted semi-analytical solution has higher precision, is suitable for two triangular translation points, and is easy to be directly invoked by orbit designers.
Owner:NANJING UNIV
Scanning mode trajectory planning method and system for large-aperture radio telescope in motion
ActiveCN112597429ASolve the speed discontinuity problemAcceleration and deceleration process is shortForecastingTelescopesSkyRadio telescope
The invention belongs to the field of motion control of large-aperture radio telescopes, particularly relates to a scanning mode trajectory planning method and system in motion of a large-aperture radio telescope, and aims to solve the problems of discontinuous speed and low effective utilization rate of a scanning trajectory caused by frequent rapid speed change and direction change of the large-aperture radio telescope. The method comprises the following steps: initializing right ascension and declination positions and speeds of starting and ending parts of each to-be-planned scanning section based on sky area scanning parameters; extracting right ascension and declination in the celestial coordinate system, and constructing a space-time Bezier curve equation of right ascension and declination time by combining time as a to-be-planned variable; taking the minimum curve curvature as a target, integrating the normal scanning segment track, and obtaining a scanning sky right ascension and declination complete track under a celestial coordinate system; and converting to obtain a planned moving track of the feed source terminal under an east-north sky coordinate system of the earth. The OTF scanning speed is continuous, the impact on the system is small, no pause process exists in the planned track, and the effective utilization rate of the scanning track is improved.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
A method for simulating the polarized field of sky diffuse reflection light on wavy water surface
InactiveCN103940515BIn line with the actual situation of natureImprove universalityLight polarisation measurementRayleigh scatteringDiffuse reflection
The invention relates to a wave water surface sky diffuse reflection light polarization field simulation method. The method has the following steps: a celestial coordinate system describing a sky light polarization field is established; sun point location and observation point location are designed in the celestial coordinate system; a sky light scattering angle is calculated in spherical geometry; degree of polarization of sky light at any point is calculated according to a semi-analytical Rayleigh scattering model; a polarization angle of sky light is calculated according to the sun point location and sky observation point coordinates via a vector mode; the polarized reflectance and the degree of polarization of wave water surface sky diffused light are calculated; and the polarization angle of water surface reflected sky light is obtained according to information of sky light degree of polarization in combination with an STOKES vector and a trigonometric function relationship so that calculation of the polarization state of water surface reflected sky light is realized. Sky light can be incident at any polarization state, and the polarization state of the reflected light of a static water surface and the wave water surface can be realized so that polarization characteristics of a natural water surface can be really described.
Owner:BEIHANG UNIV
Single factor atmospheric polarization modeling method based on Rayleigh scattering
InactiveCN101532881BImprove accuracyImprove acceleration performanceLight polarisation measurementRayleigh scatteringElectrical field strength
The invention provides a single factor atmospheric polarization modeling method based on Rayleigh scattering, comprising the following steps: selecting the observation point and establishing a celestial coordinate system and obtaining the current time sun position using the observation time and observation point geographic coordinate; selecting any point to be measured on the celestial sphere surface and solely determining a northeast coordinate system based on the current time sun position using the point to be measured as the coordinate origin; in the northeast coordinate system, decomposing the incidence natural light into two beams of linearly polarized light in same intensity, vertical electric-field vibration direction, no fixed phase relation, and computing the scattered light electric field strength component under linearly polarized light incidence. The method uses the electric intensity vector to describe light wave and uses the vector size of the scattered light electric field strength component to obtain the polarization degree of the point to be measured and uses the vector direction of the scattered light electric field strength component to obtain the polarization direction of the point to be measured, thus the distributed model of the all-day atmospheric polarization information is obtained and the accuracy and the expansibility of the atmospheric polarization model is increased.
Owner:HEFEI UNIV OF TECH
Representation instrument of celestial coordinate systems
InactiveCN103943024AImprove manual brain abilityImprove intelligencePlanetaria/globesEarth modelCelestial sphere
A representation instrument of celestial coordinate systems is formed by a celestial sphere model, an earth model, a support, a first auxiliary ring, a second auxiliary ring, a third auxiliary ring first half-ring, a third auxiliary ring second half-ring and a sliding handle; the celestial sphere model is fixed on the support in a rotatable mode; the inner wall of the celestial sphere model comprises the two auxiliary rings which are perpendicular to each other; the earth model is fixed on a shaft rod which is arranged in the center of the celestial sphere model; the sliding handle is used for controlling rotation of the two auxiliary rings which are perpendicular to each other and are arranged in the celestial sphere model through a magnet; the inner diameter of a third auxiliary ring is equal to the outer diameter of the celestial sphere model; the third auxiliary ring can be fixed on the outer wall of the celestial sphere model if necessary. According to the representation instrument of the celestial coordinate systems, learners can analyze the four celestial coordinate systems, the relation between the four celestial coordinate systems and the relation between the celestial coordinate systems and a celestial sphere; the functions which can be shown through the traditional celestial globe can be achieved; the mind and hand capability of students can be increased and the intelligence of the students can be stimulated through operation on the auxiliary rings of the students.
Owner:吴育忠 +1
Celestial coordinate system indicator
InactiveCN103943024BImprove manual brain abilityImprove intelligencePlanetaria/globesCelestial sphereEarth model
A representation instrument of celestial coordinate systems is formed by a celestial sphere model, an earth model, a support, a first auxiliary ring, a second auxiliary ring, a third auxiliary ring first half-ring, a third auxiliary ring second half-ring and a sliding handle; the celestial sphere model is fixed on the support in a rotatable mode; the inner wall of the celestial sphere model comprises the two auxiliary rings which are perpendicular to each other; the earth model is fixed on a shaft rod which is arranged in the center of the celestial sphere model; the sliding handle is used for controlling rotation of the two auxiliary rings which are perpendicular to each other and are arranged in the celestial sphere model through a magnet; the inner diameter of a third auxiliary ring is equal to the outer diameter of the celestial sphere model; the third auxiliary ring can be fixed on the outer wall of the celestial sphere model if necessary. According to the representation instrument of the celestial coordinate systems, learners can analyze the four celestial coordinate systems, the relation between the four celestial coordinate systems and the relation between the celestial coordinate systems and a celestial sphere; the functions which can be shown through the traditional celestial globe can be achieved; the mind and hand capability of students can be increased and the intelligence of the students can be stimulated through operation on the auxiliary rings of the students.
Owner:吴育忠 +1
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