Fast Calculation Method of Observation Time Window of Ground Objects by Optical Remote Sensing Satellites
A technology of observation time and fast calculation, which is applied in the field of optical remote sensing satellite measurement, can solve the problems of inability to support point target and area target access calculation at the same time, cannot effectively guarantee calculation accuracy, and low calculation efficiency, so as to avoid low algorithm efficiency and shrink The effect of sampling range and fast calculation speed
Active Publication Date: 2021-03-19
SPACE STAR TECH CO LTD
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[0005] The problem to be solved by the invention is that, for the existing on-board calculation methods, the access calculation of point targets and area targets cannot be supported at the same time, resulting in low calculation efficiency and the inability to effectively guarantee the calculation accuracy
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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
[0039] like figure 1 As shown, the present invention designs a fast calculation method for the observation time window of an optical remote sensing satellite to a ground target. The method mainly includes:
[0040] Step 1. Calculate the sub-satellite point data of the satellite in advance and save it to the database for subsequent use;
[0041] First, the method of the present invention defines the observation time window as follows:
[0042] like figure 2 As shown, T is the flight path of the satellite, and W1 and W2 are the shooting widths of the satellites. In the case of no side-swing maneuver, the shooting range of the satellites is the shadow part, that is, the width range between W1 and W2.
[0043] like image 3 As shown in the figure, T' is the sub-satel...
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The invention provides a rapid calculation method for observation time window of ground target by optical remote sensing satellite. The method comprises the following steps of: calculating sub-satellite point data of the satellite and sub-satellite point data of breadth of the satellite after maximum side sway maneuver in advance, and storing corresponding latitude and longitude; according to theappointed task time, subsatellite point data query is carried out, sorting is carried out according to the ephemeris time sequence, and a final coarse screening result is obtained; according to whether the ephemeris time is continuous or not, sub-satellite point data in the result are split into different stripes, and then the shortest distance between each vertex of the target area and each sub-satellite point in the stripe data is calculated according to information of each vertex of the target area or the point target so as to obtain a vertical foot point of each vertex in a sub-satellite point track; calculating the start time and the end time of observation according to the sub-satellite point track time corresponding to the vertical foot point; and calculating a satellite lateral swing angle and a sun elevation angle according to the vertical foot point corresponding to the target center point. The method supports parallel access calculation of the point target and the region target, and has the characteristics of high calculation speed and low time complexity.
Description
technical field [0001] The invention belongs to the technical field of optical remote sensing satellite measurement, and relates to a fast calculation method for an observation time window of an optical remote sensing satellite on a ground target. Background technique [0002] In recent years, with the continuous increase in the number of satellites in orbit in my country, the continuous enhancement of satellite capabilities, and the continuous increase in the complexity of user requirements, satellite Earth observation mission planning has gradually shifted from single-satellite self-contained system management to multi-satellite formation or constellation. Network management. Compared with conventional observation tasks, some emergency observation tasks often require multiple satellites or even multiple series of satellites for coordinated observation, requiring satellites to respond quickly and complete the task, which puts forward higher requirements for the timeliness of...
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IPC IPC(8): G06F16/2453G06F16/22
Inventor 陈浩一齐昕浒张鹏闫东磊胡寅龙高越
Owner SPACE STAR TECH CO LTD