Time window generation method and device

Abstract

A time window generation method and device are provided. The method comprises the following steps: obtaining the object longitude value and the object latitude value of the target object; Obtaining acurrent longitude value and a current latitude value of the satellite subsatellite point at the current time; Judging whether a target object is in a preset observation area at a current time according to the object longitude value, the object latitude value, the current longitude value and the current latitude value; Determining a time range within which the target object can be observed while the satellite is orbiting the earth according to a plurality of time points within the preset observation area. As that scheme describe in the embodiment of the present application determines the time range in which the target object can be observe according to the position of the target object and the position of the point below the star at each time point, the embodiment of the present applicationcan greatly improve the calculation efficiency and save the calculation time.

Description

technical field [0001] The present application relates to the technical field of satellite imaging, and in particular, to a method and device for generating a time window. Background technique [0002] When calculating the satellite’s observation time window for objects on the ground, the coordinates of the satellite’s imaging area and the coordinates of the target object range are often calculated first, and then the imaging area and the target object start to exist at the same latitude until the imaging area and the target Objects do not have the same latitude within the time length between moments, and whether the imaging area covers the target object is used to judge whether the time period is the access time window. [0003] In the prior art, this method of obtaining the observation time window requires calculating the coordinates of the imaging area at each time point at each calculation, and then judging the time period when the target object may be covered by the ima...

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Problems solved by technology

[0003] In the prior art, this method of obtaining the observation time window requires calculating the coordinates of the imaging area at each time point at each calculation, and then judging the time period when the target object may be covered by the imaging area, and then in this time period Then calculate the coordinate position of the imaging area and the relationship between the coordinates between the imaging area and the target object. Therefore, this calculation method has a large amount of calculation and low efficiency.

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