| CPC B64G 1/1021 (2013.01) [G01W 1/10 (2013.01); G05D 1/0094 (2013.01); G06F 18/2321 (2023.01); G06V 20/13 (2022.01); B64G 1/1028 (2023.08)] | 12 Claims |
|
1. A computer system for acquisition of satellite images associated with at least one predetermined zone of the Earth previously divided according to a grid of cells, the computer system comprising:
at least one Earth observation satellite comprising:
an optical imaging system configured to acquire at least one satellite image on at least one acquisition date;
a first satellite transmitter-receiver configured to receive a command signal; and
a first processor configured to command the optical imaging system based on the command signal;
at least one mission plan calculation device for the at least one Earth observation satellite comprising:
a second satellite transmitter-receiver configured to transmit the command signal; and
a memory configured to store, for each cell, a history of meteorological variable values which comprises meteorological observations and/or meteorological forecasts which were observed and/or which were forecast on a certain date preceding the acquisition date;
a second processor configured for:
determining, for each cell, based on the history of meteorological variable values, a plurality of groups of values which each comprise, at least:
a first meteorological variable value associated with a first history date;
a second meteorological variable value associated with a second history date later or earlier than the first history date, and
a history time difference between the first history date and the second history date;
calculating, for all or part of the predetermined zone of the Earth, based on the plurality of groups of values, a conditional probability function which describes the probability of observing a second meteorological variable value included in a predetermined interval on a second date subject to a condition of:
observing a first meteorological variable value at a first date which is prior to the second date, and/or
predicting on a first date a third meteorological variable value for a forecast date proximate the second date and which precedes, follows and/or is equal to the second date, and
under an additional condition of observing a predetermined time difference between the first date and the second and/or forecast date,
selecting a plurality of cells from the grid, intended to be overflown by the at least one Earth observation satellite on the acquisition date, based on orbital characteristics of the at least one Earth observation satellite, thereby obtaining candidate cells,
obtaining, for each candidate cell, at least one current meteorological observation associated with a planning date which precedes the acquisition date and/or at least one current meteorological forecast associated with a date located around the acquisition date,
calculating a mission plan for the at least one Earth observation satellite based on the candidate cells and the conditional probability function, and
inserting the mission plan into the command signal.
|