7 results about "Occultation" patented technology

The invention provides an occultation constellation observation system simulation and forecast capability evaluation method, which comprises the following steps of: simulating and calculating an atmospheric refractive index by using a GNSS (Global Navigation Satellite System) radio occultation refractive index observation operator; simulating and calculating a one-dimensional bending angle by using a GNSS radio occultation one-dimensional bending angle observation operator; simulating and calculating a two-dimensional bending angle by using a GNSS radio occultation two-dimensional bending angle observation operator; correcting the bending angle of the L2 frequency on the basis of the difference between the bending angles of the L1 and L2 frequencies; and completing quality control of occultation observation data based on the atmospheric refractive index, the one-dimensional bending angle, the two-dimensional bending angle, the corrected bending angle of the L2 frequency and the actually collected occultation observation data, wherein the atmospheric refractive index, the one-dimensional bending angle and the two-dimensional bending angle are calculated through simulation. By establishing the error evaluation model for the autonomous occultation constellation observation data, the assimilation application effect of the autonomous occultation constellation observation data in the numerical weather forecasting system can be optimized, and direct technology and experience can be provided for business operation of future observation data in the numerical weather forecasting system.

This application discloses a one-dimensional variational inversion method and apparatus for GNSS occultation data. The method includes background field preparation: interpolating temperature, air pressure, and water vapor pressure from the grid field to the latitude and longitude of the occultation data; simultaneously, interpolating the liquid water content and ice water content in the clouds to the latitude and longitude of the occultation data to obtain the background field profile required for inversion; and inputting observation data and background field: inputting the occultation data, background field profile, observation error covariance matrix, and background field error covariance matrix into the one-dimensional variational inversion system. By adding liquid water content and ice water content terms to the observation operator, the deviation between the observation data and the background field data is calculated, and the distribution characteristics of the deviation are statistically analyzed. After adding liquid water and ice water, the average refractive index deviation between the two types of data is significantly reduced.

The application provides a GNSS interference detection method and system based on AGC gain of a spaceborne GNSS occultation detector, the method comprising: reading AGC gain data and LEO satellite position data; time matching the AGC gain data and the LEO satellite position data; determining AGC gain under a condition without GNSS interference; calculating an AGC gain difference sequence; and performing GNSS interference detection on the AGC gain difference sequence based on a set GNSS interference detection threshold. The application has the advantages that it is suitable for a spaceborne GNSS occultation detector, and provides an effective solution for GNSS interference detection based on observation of the spaceborne GNSS occultation detector, which is simple, effective and easy to implement.

The present invention discloses a method and system for spatio-temporal data analysis of occultation data. The method includes: acquiring the spatio-temporal data of occultation data, where the spatio-temporal data includes: the time when the occultation event occurs, and the geodetic longitude, latitude, and altitude of the occultation tangent point; dividing the Earth's surface into uniform grids in space; according to the spatio-temporal data of the occultation event, projecting and accumulating the occultation events into the corresponding grids in sequence according to the chronological order of their occurrence, to obtain the occultation spatio-temporal data divided by grids; according to the occultation spatio-temporal data divided by grids, calculating the number of occultation events and its spatio-temporal distribution data, where the spatio-temporal distribution data includes: global coverage rate and global uniform coverage index; according to the number of occultations and its spatio-temporal distribution data, drawing a global coverage situation diagram of occultation events and the trend diagrams of the number and coverage rate changing with time, and conducting analysis on the coverage rate, uniformity, and timeliness of occultation events in specific time periods and specific regions.

The invention relates to a pose measurement and control method of a distributed external shielding planet observation system, and belongs to the field of space astronomical telescopes. The method comprises the following steps: performing primary satellite and secondary satellite formation setting on a telescope; performing relative translation coarse alignment on the primary satellite and the secondary satellite; performing focal length precise adjustment on the primary satellite and the secondary satellite; performing three-dimensional attitude precise alignment on the primary satellite and the secondary satellite; the star shielding cover is arranged between the telescope and the interference fixed star, and the positions and poses of the star shielding cover and the telescope are adjusted. According to the invention, micron-level relative attitude determination and synchronization, centimeter-level formation flight control and arc-second-level measurement resolution can be realized.

The invention relates to the technical field of occultation observation, and discloses an occultation atmospheric bending angle observation error confirmation method. The confirmation method comprises the following steps: obtaining an occultation atmospheric bending angle in occultation data, and a first meteorological data set and a second meteorological data set which correspond to an occultation profile in the occultation data and are not derived from the current occultation; determining a first atmospheric bending angle according to the first meteorological data set, and determining a second atmospheric bending angle according to the second meteorological data set; obtaining a first bending angle error between the occultation atmospheric bending angle and the first atmospheric bending angle, a second bending angle error between the occultation atmospheric bending angle and the second atmospheric bending angle, and a third bending angle error between the first atmospheric bending angle and the second atmospheric bending angle; and determining obscuration atmospheric bending angle observation errors through a formula. By adopting the confirmation method, the objectivity of the observation error can be improved. The invention further discloses a device for confirming the obscuration atmospheric bending angle observation error and a using method.

The application relates to the technical field of occultation observation, and discloses a method for confirming an observation error of an occultation atmospheric bending angle. The method comprises the following steps: obtaining an occultation atmospheric bending angle in occultation data, and first and second meteorological data sets corresponding to an occultation profile in the occultation data and not derived from a current occultation; determining a first atmospheric bending angle according to the first meteorological data set, and determining a second atmospheric bending angle according to the second meteorological data set; obtaining a first bending angle error of the occultation atmospheric bending angle and the first atmospheric bending angle, a second bending angle error of the occultation atmospheric bending angle and the second atmospheric bending angle, and a third bending angle error of the first atmospheric bending angle and the second atmospheric bending angle; and determining the observation error of the occultation atmospheric bending angle through a formula. The method can improve the objectivity of the observation error. The application also discloses a device for confirming the observation error of the occultation atmospheric bending angle and a use method.