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71 results about "Occultation" patented technology

An occultation is an event that occurs when one object is hidden by another object that passes between it and the observer. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks from view (occults) an object in the background. In this general sense, occultation applies to the visual scene observed from low-flying aircraft (or computer-generated imagery) when foreground objects obscure distant objects dynamically, as the scene changes over time.

A Satellite Navigation Occultation Signal Generation System

ActiveCN102288974AThe simulation scene is controllableSolve the costSatellite radio beaconingIntermediate frequencyFrequency conversion
The invention discloses a system for generating a satellite navigation occultation signal. The system comprises a parameter calculating and real-time updating module, a middle-frequency navigation signal generating module, a DAC (Digital to Analog Convertor) module and an upper frequency conversion module, wherein the parameter calculating and real-time updating module is used for receiving inputdirect star observing data and occultation observing data, generating an accumulative parameters and power control codes corresponding to the direct star observing data and the occultation signal observing data respectively, compensating for the accumulative parameters of the direct star observing data and the occultation observing data, and outputting the power control codes and the compensated accumulative parameters to the middle-frequency navigation signal generating module; and the middle-frequency navigation signal generating module is used for generating a direct star digital middle-frequency simulation signal and an occultation digital middle-frequency simulation signal according to the input power control codes and the compensated accumulative parameters, and outputting to the DAC module. Due to the adoption of the system, the problems of high field experiment cost, easiness of interference and uncontrollable and unrepeatable simulation scene are solved effectively.
Owner:SPACE STAR TECH CO LTD

Multimode occulting antenna with stable phase center

A multimode occulting antenna with a stable phase center comprises a reflection cavity, a lower radiation paster, an upper radiation paster, four feed probe sleeves, four feed probe inner cores and two support columns. Each feed probe sleeve comprises a metal seat and filler, one end of the metal seat is a metal column, the other end of the metal seat is a cylindrical metal cavity, and the filler is used for filling the cylindrical cavity of the metal seat. The sleeve-shaped probes are coupled with feed through four points, probes are uniformly distributed on the circumference, an aerial radiation paster consists of an upper layer and a lower layer, the lower layer is coupled with the feed through the sleeve-shaped probes, the upper layer is coupled with the feed through the lower radiation paster, the middle is supported by the metal support columns, and the reflection cavity is of a round bowl-shaped structure and higher than the upper radiation paster. The occulting antenna is excellent in performance and structure, simple and reliable in process, wide in frequency band, capable of meeting use requirements of a GPS (global positioning system), BD-2, GALILEO and GLONASS, wide in beam coverage, high in gain, stable in phase center, excellent in axial ratio performance, and applicable to a precise obscuration detection system and other high-precision detection systems.
Owner:SPACE STAR TECH CO LTD

Multi-source data fusion-based three-dimensional ionosphere chromatographic method

The invention discloses a multi-source data fusion-based three-dimensional ionosphere chromatographic method, utilizes GNSS observation data, occultation observation data on low orbit satellites, Jason-1 and Jason-2 seasat altimetry data and ionosphere altimeter data for the first time, and develops research on ionosphere electron density tomography. An inversion result is compared with observation data of an incoherent scattering radar, and a result verifies effectiveness and reliability of the three-dimensional ionosphere chromatographic method provided by the invention in fusing multi-source data to perform inversion of ionosphere electron density and superiority of the method to use of GPS observation data alone to perform inversion.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Method for detecting shift error of occultation double-frequency GPS receiver

The invention relates to globe positioning system GPS receiver technical field, in particular to a method for measuring the obscuration error of dual-frequency obscuration GPS receiver. The method uses two obscuration receivers in one antenna which are same object receivers, or one is provided with known measurement error, and another one is the object receiver, to use the two measurement errors of the two receivers to obtain the measurement error of the obscuration receiver. The method comprises that 1, the GPS signal via the antenna of the obscuration receivers receive real GPS signal, 2, setting the sample rate of the receivers, 3, analyzing the data of the two receivers, 4, calculating the high-load noise ratio measurement error and averaging, via the high-quality data, 5, calculating out the integral measurement error.
Owner:NAT SPACE SCI CENT CAS

Quick data processing method of occultation event of parallel asterism

The invention relates to the technical fields of the application and the parallel computation of a navigational satellite, in particular to a quick computation method of an occultation event of a parallel asterism. The method comprises the following steps of: navigating constellations, reading occultation asterism information, distributing satellite pairs according to an obtainable computation core, computing occultation event information accurately and finally, storing as an information file for subsequent occultation data processing. The method provided by the invention is applied to an occultation data processing system, is especially applied to the preprocessing process of a near-real-time (3 to 6h) occultation data processing system for computing the important part of the occultation event information, can enhance the computation efficiency of the process greatly and reduces the computation time greatly, thereby providing quicker data guarantee to the near-real-time application of occultation data applied to weather forecast and space weather forecast.
Owner:WUHAN UNIV

System for detecting atmospheric temperature and pressure profile of near space

The invention discloses a system for detecting the atmospheric temperature and pressure profile of the near space. The system comprises a first precision orbit determination module and a microwave occultation signal transmitting module which are arranged on a transmitting satellite; a second precision orbit determination module and a microwave occultation signal receiving module which are arranged on a receiving satellite; and an atmospheric temperature and pressure profile inversion module which is arranged on an upper computer. The first precision orbit determination module is used for generating precision orbit determination observation data of a launching satellite; the microwave occultation signal transmitting module is used for generating and transmitting a microwave occultation signal, and is also used for transmitting precise orbit determination observation data of a transmitting satellite to the atmospheric temperature and pressure profile inversion module; the second precise orbit determination module is used for generating precise orbit determination observation data of a receiving satellite; the microwave occultation signal receiving module is used for receiving microwave occultation signals and processing the signals to obtain microwave occultation signal observed quantity; and the atmospheric temperature and pressure profile inversion module is used for performing inversion to obtain an atmospheric temperature and pressure profile.
Owner:NAT SPACE SCI CENT CAS

GNSS occultation ionospheric residual correction method and system, device and storage medium

ActiveCN110275184ATaking into account inhomogeneityHigh precisionSatellite radio beaconingObservation dataIonospheric heater
The invention provides a GNSS occultation ionospheric residual correction method and system, a device and a storage medium. The method comprises the steps of: preprocessing GNSS occultation original observation data, vTEC maps data and geomagnetic field observation data to obtain GNSS occultation geometric data, ionospheric data and geomagnetic field data; based on the GNSS occultation geometric data, a three-dimensional NeUoG ionospheric mode and the ionospheric data, calculating an electron density profile at the location of an ionospheric puncture point on an incident ray side and an emergent ray side; based on the GNSS occultation geometric data, an IGRF geomagnetic field mode and the geomagnetic field data, calculating a geomagnetic field intensity profile along a signal path at the location of the ionospheric puncture point on the incident ray side and the emergent ray side; based on the electron density and the geomagnetic field intensity along the signal path, calculating a bending angle ionospheric residual profile. The method of the invention can be used in the atmospheric parameter inversion of a single GNSS occultation event, weakens the influence of the ionospheric residual, obtains a high-precision GNSS occultation curved angular profile, and is efficient and reliable.
Owner:NAT SPACE SCI CENT CAS

SPSA meteorological parameter solution method based on assimilation of navigation satellite occultation data

The invention discloses an SPSA meteorological parameter solution method based on assimilation of navigation satellite occultation data. The method is characterized by comprising the following steps that a cost function of occultation data assimilation is established, the first-order approximation gradient of the cost function is calculated, the atmosphere state vector is updated by utilizing the approximation gradient, the cost function value under the present atmosphere state vector is solved, whether an iteration stop condition is met is determined, and if yes, the solution of the atmosphere state vector is obtained. It is not required to design a tangent operator and an adjoint operator of an observation operator, the solution algorithm of the cost function is greatly simplified, the efficiency and feasibility for solving the atmosphere state vector are improved, and the method can be widely applied.
Owner:HEFEI UNIV OF TECH

Method for forward simulation of occultation

The invention provides a method for forward simulation of occultation. The method is applicable to the GNSS earth atmosphere occultation exploration constellation design and analysis application. According to the method, satellite orbit parameters serve as design input, constellation construction parameters are supplemented to serve as design input, and constellation design and analysis application are facilitated; influence of atmospheric refraction is taken into comprehensive consideration in the process of occultation event judgment and positioning, and occultation measuring point positioning accuracy is improved; ground data transmission station modeling is added, and downloading timeliness of occultation exploration data can be supplemented and analyzed.
Owner:AEROSPACE DONGFANGHONG DEV LTD

Atmospheric composition inversion method of obscuration detection instrument

The invention relates to an atmospheric composition inversion method of an obscuration detection instrument. On the basis of parameter characteristics of an occultation detection instrument, an ARTS-based occultation forward mode is established; an atmospheric background base is established based on ten-year MLS global atmospheric products; statistic calculation is carried out to obtain an initialvalue field of a target component; and layered constriction is carried out on iteration of different height layers during the inversion process.
Owner:INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI

Variable-step-size obscuration forecasting method

The invention discloses a variable-step-size obscuration forecasting method. The variable-step-size obscuration forecasting method comprises the steps of: firstly, defining a satellite-target source coordinate system and establishing a conversion matrix corresponding to a WGS-84 coordinate system; then establishing a criterion of obscuration events of a satellite in the satellite-target source coordinate system; if the criterion is satisfied, further judging whether a vector of a connecting line between the satellite and a target source is within an observable range of a satellite obscuration antenna; if so, considering that an obscuration event occurs, and further performing effective forecasting on the obscuration event. The obscuration generation process is converted into a geometrical problem that a fixed-point rotating ray cuts the circumference within the satellite-target source plane by adopting a coordination conversion idea, so that the physic principle of the generation of the obscuration event is revealed substantially; the variable-step-size obscuration forecasting method is a variable-step-size obscuration forecasting algorithm which can efficiently improve the calculation efficiency; through the combination with the installation of the satellite obscuration antenna, the variable-step-size obscuration forecasting method is suitable for the practical project application and is particularly suitable for forecasting the sun or the GPS obscuration event for a long time.
Owner:AEROSPACE DONGFANGHONG SATELLITE

Aerostat occultation forecast method based on inertial navigation

The invention discloses an aerostat occultation forecast method based on inertial navigation. The method comprises the following steps: acquiring location speed of all GNSS navigation stars under a WGS84 coordinate system according to positioning equipment of an occultation explorer, and then computing location speed, longitude, latitude and height of the aerostat; computing pitch angles and azimuth angles of all GNSS navigation stars and an azimuth angle of the aerostat body, judging whether the obtained pitch angle Elv, the azimuth angle Azm and antenna installation azimuth satisfy the threshold of an occultation event; if the obtained pitch angle Elv, the azimuth angle Azm and antenna installation azimuth satisfy the threshold of the occultation event, judging that the GNSS navigation star is the occultation. The occultation event is judged by adopting the continuous arc sections through the inertial navigation equipment, the accuracy of a forecast result is enhanced, the method issimple and easy to implement, and has important application value for the real-time forecast.
Owner:CMA METEOROLOGICAL OBSERVATION CENT +1

Satellite-borne occultation real-time forecasting method

The invention discloses a satellite-borne occultation real-time forecasting method. The method comprises the steps of: obtaining the position velocity of a spacecraft according to the positioning device of an occultation detector; calculating the orbit parameter of the spacecraft; calculating the position velocity of the spacecraft and all navigation stars after 10s; calculating the pitch angle, the azimuth angle, the tangent point height of all navigation stars and the antenna azimuth angle of the spacecraft; judging whether the obtained pitch angle Elv, the tangent point height Hight and theantenna azimuth angle satisfy the threshold of the occultation event extrapolating the time for 30 s and 1 min, repeating the above calculation and determination processes if satisfied; and determining that the navigation star is the occultation if all are satisfied. The method of the invention adopts a continuous arc to judge the occultation event through an inertial navigation device, and enhances the accuracy of the forecasting result. The method is simple and easy to implement, and has important application value for real-time forecasting.
Owner:天津讯联科技有限公司 +1

Data treatment method of parallelization Abel transformation atmospheric parameters

The invention relates to the technical fields of satellite navigation, atmospheric sounding and parallel computation, and in particular relates to a data treatment method of parallelization Abel transformation atmospheric parameters. Because no time dependence on data treatment exists among occultation events generated by an LEO asterism occultation system, the back calculation of the Abel transformation atmospheric parameter of each occultation event is mutually independent. Based on the point, the data treatment method of the parallelization Abel transformation atmospheric parameters is provided by the invention, and the back calculation of the Abel transformation atmospheric parameter is realized by adopting a high-efficiency parallelization method with fine granularity. Aiming at the condition that no time dependence exists within the back calculation process of the Abel transformation atmospheric parameter, the atmospheric parameter back calculation on the multiple occultation events is carried out by completely adopting a fine granularity parallel mode, thus the invention has the characteristics of high efficiency, simple method and high execution efficiency, is suitable for computer systems, and can effectively improve the core part of the asterism occultation data system, i.e. the work efficiency of the atmospheric parameter back calculation.
Owner:WUHAN UNIV

Cloud-base height inversion method based on radio occultation detection data

The invention discloses a cloud-base height inversion method based on radio occultation detection data, comprising the following steps of: firstly, giving statistics of distribution characteristics within the worldwide COSMIC occultation vertical sounding scope and calculating the probability of the cloud-base height inversion influenced by the COSMIC sounding scope; secondly, reading temperaturedata and water vapour pressure data from COSMIC occultation detection moist air data; thirdly, acquiring cloud-base height information with the combination of relative humidity variation profile inversion based on the method brought forward by Wang for determining the cloud-base height by using relative humidity profile data; finally, based on the method brought forward by Wang for determining the cloud-base height by using the relative humidity profile data, carrying out the cloud-base height inversion by the adoption of radiosonde detection data, and calculating the relative difference between the radiosonde cloud-base height inversion result and the COSMIC cloud-base inversion result. The cloud-base height inversion method provided by the invention makes up the defects that previous satellite remote sensing can not provide bottom cloud-base height information and the reliability of field observation is poor for the detection of the medium cloud-base height and the high cloud-base height.
Owner:中国人民解放军理工大学气象学院

Atmosphere laser occultation signal generation and detection equipment

The invention discloses atmosphere laser occultation signal generation and detection equipment and belongs to the technical field of atmospheric remote sensing measurement. In order to solve the problem that characteristic gas components and concentrations cannot be measured in the existing occultation signal generation system, the atmosphere laser occultation signal generation and detection equipment comprises a frequency and power stabilizing circuit, a quantum well laser array, a beam coupler, an optical fiber isolator, a power amplifier, an optical transmitting antenna, a first optical filter, a first collimating mirror, a first two-dimensional galvanometer, a second optical filter, a first coupling lens, a first beacon beam laser, a second coupling lens, a first imaging camera, an optical receiving antenna, a third optical filter, a second collimating mirror, a second two-dimensional galvanometer, a fourth optical filter, a third coupling lens, a second beacon beam laser, a fourth coupling lens, a second imaging camera, a third collimating mirror, a cylindrical mirror, a diffraction grating, an imaging reflector, an imaging CCD, a signal processing circuit and a data inversion module. The equipment has wide applications in the fields of atmospheric chemistry, global climate change, military battlefield aircraft monitoring and the like.
Owner:CHANGCHUN UNIV OF SCI & TECH

Headlamp for a motor vehicle comprising a moveable mask equipped with locking means

The invention proposes a lighting headlamp for a motor vehicle, comprising a light source, a reflector of the elliptical type, a first focus of which is arranged in the vicinity of the source and a second focus of which is arranged in the vicinity of the focal plane of a convergent lens, and a movable mask which is mounted so as to pivot, with respect to a fixed mounting, about an overall transverse axis, and which is capable of occupying an angular occultation position, in which it is arranged substantially vertically in the vicinity of the focal plane of the lens so as to form a cutoff in the light beam produced by the headlamp, and a retracted angular position, a spring forcing the movable mask into its occultation position, wherein it also comprises at least one locking means acting between the mounting and the mask in order to hold the mask in its occultation position.
Owner:VALEO VISION SA

System and method for filling gaps in radar coverage

A method of positioning a plurality of radar units in a defined area amongst one or more legacy radar units that provide legacy radar coverage in the defined area is disclosed. The steps of identifying a location of each legacy radar unit, setting a threshold altitude, and determining a legacy occultation of each legacy radar unit from a landscape level up to the threshold altitude are also disclosed. Mapping the legacy occultation of the legacy radar units to provide a three dimensional occultation map in the defined area and locating gaps below the threshold altitude in the legacy radar coverage as a function of the occultation map are also disclosed. Identifying a plurality of sites as a function of the gaps where the sites are accessible to receive a radar unit is also disclosed. Determining an anticipated radar coverage of a radar unit positioned at each of the sites and determining a reduction in the gaps as a function of the anticipated radar coverage are also disclosed. Selecting sites as a function of the reduced gaps is also disclosed. X band, C band or S band radar units can be positioned at the selected sites. The threshold altitude can be 10,000 or 15,000 feet. Affected populations and costs can also be considered in radar placement.
Owner:LAPOINT BLASE IND +1

Temperature and pressure profile and tangent height joint inversion method

ActiveCN107505632AThe error can be estimated quantitativelyRealize simultaneous inversionSatellite radio beaconingEngineeringRadiation transfer
The invention relates to a temperature and pressure profile and tangent height joint inversion method, which is characterized by establishing a prior profile, a prior covariance matrix and an observation covariance matrix; inputting geographic and geometric information observed by a satellite into a forward radiation transfer model SCIATRAN to obtain an analog value and a weight function of the temperature; by combining the analog value, the weight function of the temperature, the prior profile, the prior covariance matrix and the observation covariance matrix, and based on an optimal estimation algorithm, obtaining a temperature profile; based on the optimal estimation algorithm, realizing temperature profile inversion of an occultation sensor, and in the inversion iteration process, realizing synchronous inversion of pressure and tangent height through a hydrostatic equilibrium equation; and finally, through iteration, obtaining a temperature profile, a pressure profile and corrected tangent height.
Owner:INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI

Supercontinuum light source-based atmospheric multi-component laser occultation detection device

The invention relates to a supercontinuum light source-based atmospheric multi-component laser occultation detection device. A supercontinuum laser source is utilized to generate mid-infrared supercontinuum laser signals capable of covering a plurality of atmospheric component characteristic absorption lines, and the concentration of various gas components in the atmosphere is measured with an occultation laser detection and heterodyne receiving mode; the device includes a power stabilization circuit, a supercontinuum laser light source, a first beam splitter, an energy monitoring module, an optical transmitting antenna, an optical receiving antenna, an optical fiber switch, a second beam splitter, a frequency control circuit, a local oscillation laser array, a combiner array, a photodetector array, a radio frequency receiver array, a lock-in amplifier array, and a data processing module. The device has broad application prospects in global climate and environmental change field, atmospheric chemistry field and the like.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Solar occultation measurement method of inversion near space atmosphere density based on X-rays

The invention relates to a solar occultation measurement method of inversion near space atmosphere density based on X-rays. The method is characterized by simultaneously measuring unattenuated solar X-ray intensity and attenuated X-ray intensity in a solar occultation path through the X-rays so as to fit the atmosphere density in a height range of 50-200km. The method has the advantages of large detection height range, low technical complexity, easy implementation and high measurement accuracy; meanwhile, the method is capable of monitoring the response of the near space atmosphere density change to the solar activity in real time; the establishment of a three-dimensional tomographic dynamic model of the near space atmosphere density is facilitated; the requirements on atmosphere parameters of development, verification and control of a near space aircraft can be met.
Owner:NAT SPACE SCI CENT CAS

Efficient and rapid occultation forecasting method based on near space floating platform

An efficient and rapid occultation forecasting method based on a near space floating platform comprises the following steps that firstly, satellite coordinates at an interpolation time node are calculated through a broadcast ephemeris; secondly, a Lagrange interpolation function is constructed, and the coordinate value of a satellite at each moment within the effective time of the ephemeris is calculated; whether the satellite is located in an occultation generation interval is judged according to the spatial position, and whether the satellite is located in an occultation antenna beam coverage range is calculated; after it is determined that an occultation event happens to a certain satellite at the current moment, the occultation duration is calculated according to an interpolation polynomial; whether the occultation is neutral atmosphere occultation or ionospheric occultation is judged according to the collision parameters; finally, in the effective ephemeris time, the geocentric angle changes at the current moment and the next moment are calculated to judge whether the occultation is ascending or descending occultation; and all satellites in the constellation are traversed. According to the method, an occultation event is efficiently and quickly estimated, the problems of large data volume and long calculation time during traditional ephemeris calculation are solved, and the occultation event forecasting precision is improved.
Owner:XIAN INSTITUE OF SPACE RADIO TECH

Occultation exploration system and method suitable for aerostat

The embodiment of the invention discloses an occultation exploration system and method suitable for an aerostat. The occultation exploration system comprises a positioning antenna, an occultation receiving antenna, a radio frequency processing device and an occultation processing device; the radio frequency processing device is used for acquiring GNSS (global navigation satellite system) signals received by the positioning antenna and the occultation receiving antenna, and performing intermediate frequency processing on the GNSS signals, thereby obtaining a digital intermediate frequency signal; the occultation processing device comprises a SOC (system on chip); a FPGA (field programmable gate array) is used for obtaining original measurement data according to the digital intermediate frequency signal, and inputting the original measurement data into an ARM; the ARM is used for obtaining an occultation exploration result according to the original measurement data. By adopting the high-performance SOC chip and FPGA+ARM architecture loaded thereon, the exploration system miniaturization, high integration, standardization and low-cost design are realized, and the system is suitable for the aerostats in multiple volumes, and the space resource utilization rate is improved.
Owner:CMA METEOROLOGICAL OBSERVATION CENT +1

Field operation helmet

The invention discloses a field operation helmet which is characterized in that sound-proof earmuffs are arranged inside the helmet, an electronic clinical thermometer occultation band is embedded in the helmet, an interphone speaker and a micro LED anti-explosion flashlight are arranged outside the helmet, a photochromic ocular lens is adopted, and reflective materials and fluorescence materials are sprayed on a helmet body. The field operation helmet integrates multiple functions, namely, a use function, a comfortably wearing function, a head safety protection function, an illuminating function, a body temperature measuring function, a camera shooting function, a communication function, a sound recording function, an eye protection function and an ear protection function. An embedded type and an outside hung type are combined to form the assembly structure of all functional assemblies, convenience and simplicity are obviously displayed, and meanwhile complex functional combination is achieved. The field operation helmet has the advantages that the categories, the number and the weight of tools which are carried by engineering workers are reduced, complexity of achieving operation through a specific function is reduced, labor intensity of the workers is lowered, and labor productivity is improved.
Owner:陈景华

Aerostat-based integrated occultation and reflection detection integrated device and method

The embodiment of the invention discloses an aerostat-based integrated occultation and reflection detection integrated device and method. The device comprises an integrated antenna array, a GNSS direct antenna, a radio frequency signal processing circuit, a digital signal processing circuit, an anti-fuse FPGA and a FLASH memory. The integrated antenna array and the GNSS direct antenna are connected with the radio frequency signal processing circuit. The radio frequency signal processing circuit is connected with the digital signal processing circuit. The digital signal processing circuit is connected with the anti-fuse FPGA. The anti-fuse FPGA is connected with the FLASH memory. According to the technical scheme, the effects of reducing detection cost, reducing device volume, configurableresources and sharing can be realized.
Owner:CMA METEOROLOGICAL OBSERVATION CENT +1

Large aperture and multiple mode extrasolar terrestrial planet detector

The invention relates to a large aperture and multiple mode extrasolar terrestrial planet detector. The large aperture and multiple mode extrasolar terrestrial planet detector comprises branch systems of an effective load system, a structure and mechanism system, a thermal control system, a solar wing system, a power supply and distribution system, a measurement control and data transmission system, an integrated electronic system, a GNC (global navigation chart) system, a propelling system and the like. Compared with traditional satellites, the detector achieves multifunctional integrated detection of occultation photometry, radial velocity measurement, planetary atmosphere transmission spectrum measurement and multiple ultraviolet wavelength detection, has space-based extrasolar planet exploration competence, can adapt to research demands of extrasolar planets and life exploration in future, and has the advantages of being integrated, large in aperture, multiple in mode, ultrahigh in precision, ultrahigh in stability and the like.
Owner:SHANGHAI SATELLITE ENG INST

Method of correcting tangent height value based on infrared occultation sensor

ActiveCN107543562AQuick Cut Height CorrectionQuick cut height correction method is easier to cut height correctionColor/spectral properties measurementsMitigation of undesired influencesAtmospheric compositionSensitivity analyses
The invention relates to a method of correcting a tangent height based on an infrared occultation sensor. The method comprises steps: first-level data are acquired through the infrared occultation sensor, wherein the first-level data comprise multiple tangent heights and an atmospheric composition; the first-level data are subjected to wave number processing to remove abnormal tangent heights in the multiple tangent heights; sensitivity analysis is carried out on multiple gases in the atmospheric composition in a wave number range; and through the sensitivity analysis, after gases which affectthe wave number in the atmospheric composition are eliminated on the basis of the wave number range, and logarithmic gradient trigonometry is adopted to correct the tangent heights in the first-leveldata. The quick tangent height correction method can perform tangent height correction based on the occultation sensor features more simply, quickly and accurately.
Owner:INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI

Single-carrier multiple-antenna occultation signal generation system

A single-carrier multiple-antenna occultation signal generation system includes a direct star - occultation data real-time generation unit and a direct star - occultation signal real-time generation unit. The direct star - occultation data real-time generation unit is used to generate an accumulative parameter and a power control code corresponding to direct star and occultation observation data; and the direct star - occultation signal real-time generation unit uses the inputted accumulative parameter and power control code to generate a five-way radio frequency signal output which respectively includes a direct star channel, a front neutral atmosphere channel, a front ionized layer channel, a rear neutral atmosphere channel, and a rear ionized layer channel. The single-carrier multiple-antenna occultation signal generation system can simulate a navigation positioning signal, an ionized layer occultation signal and a neutral atmosphere occultation signal, so that the single-carrier multiple-antenna occultation signal is truly realized; and the occultation signal source parallel with the simulation network can be formed to carry out the multi-star occultation signal simulation.
Owner:SPACE STAR TECH CO LTD

Satellite borne obscuration receiver quick positioning method based on satellite platform system

Provided is a satellite borne obscuration receiver quick positioning method based on a satellite platform system. A GPS receiver receives a signal of a GPS satellite constellation, processes the signal to obtain GPS ephemeris information, time information, satellite position information and GPS constellation distribution forecast information; the GPS receiver receives an auxiliary information poll instruction sent out by a satellite service dispatching unit and outputs the obtained GPS ephemeris information, time information, satellite position information and GPS constellation distribution forecast information to a first-level CAN bus of a network on a satellite; the satellite service dispatching unit outputs the GPS ephemeris information, time information, satellite position information and GPS constellation distribution forecast information to a second-level CAN bus of the network on the satellite; a satellite borne obscuration receiver receives the GPS ephemeris information, time information, satellite position information and GPS constellation distribution forecast information obtained from the second-level CAN bus of the network on the satellite and first verifies the information, and if the information is effective, then quick locating is achieved through the information. According to the satellite borne obscuration receiver quick positioning method based on the satellite platform system, the locating time for the first time in starting and work of a specified arc section of the obscuration receiver is reduced, and the availability ratio of obscuration observation data is improved.
Owner:AEROSPACE DONGFANGHONG SATELLITE

Aerostat-based occultation detection system and method

Embodiments of the invention disclose an aerostat-based occultation detection system and method. The system comprises a GNSS occultation antenna array, a GNSS through antenna, a radio frequency signalprocessing circuit, a digital signal processing circuit, an anti-fuse FPGA and a FLASH memory; the GNSS occultation antenna array is connected with the radio frequency signal processing circuit; theGNSS through antenna is connected with the radio frequency signal processing circuit; the radio frequency signal processing circuit is connected with the digital signal processing circuit; the digitalsignal processing circuit is connected with the anti-fuse FPGA; the anti-fuse FPGA is connected with the FLASH memory; and the FLASH memory is used for storing a bit stream file. According to the technical scheme provided by the embodiment of the invention, the bit stream files with different functions are loaded to an SOC processor by analyzing the telemetering instructions, an ionized layer mask occultation function and an atmospheric occultation detection function are rapidly switched, and key observation is carried out on the key region.
Owner:CMA METEOROLOGICAL OBSERVATION CENT +1
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