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Method for choosing tasks by foresight

A technology for tasks and task groups, applied in the direction of multi-programming devices, etc., can solve the problems of increasing task scheduling problem scale, troublesome conflict identification and resolution rules, large problem scale, etc., achieving good versatility and flexibility, resolving conflict judgments With trade-offs, the effect of satisfying the time complexity of the algorithm

Active Publication Date: 2012-12-26
AEROSPACE DONGFANGHONG SATELLITE
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Problems solved by technology

The disadvantage of this method is that due to the complexity of the constraints, the problem scale is large, the solution is difficult and time-consuming
For example, in the method of R.Sherwood et al., due to the cumbersome conflict identification and resolution rules adopted, the solution efficiency is low. In the application of EO-1, only 4 tasks can be scheduled every day, which is difficult to meet the requirements of multi-task scheduling. Require
[0006] With the help of the large-angle attitude maneuver capability, the rapid attitude maneuvering imaging satellite widens the visible time window of the target, greatly increases the observation opportunities of the target, and also increases the number of applications of roll maneuver and pitch maneuver. Among them, ignoring the time of a satellite attitude maneuver may lead to the complete impracticability of the follow-up plan, and the number of observation tasks undertaken by the fast attitude maneuver imaging satellite must be far more than that of traditional satellites, and the scale of its task scheduling problem will also be greatly increased. Existing scheduling methods are difficult to obtain a satisfactory solution in a relatively short period of time, so they can no longer meet the needs of fast attitude maneuver imaging satellite task scheduling

Method used

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  • Method for choosing tasks by foresight

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Embodiment

[0114] Consider a fast attitude maneuvering imaging satellite operating in a sun-synchronous circular orbit. At 00:00:00.000 UTC on July 26, 2009, the instantaneous root number is 7051.2km, the orbital inclination is 97.3087°, and the right ascension of the ascending node is 249.758°, latitude argument 0°. The satellite attitude maneuver range is ±45° in the pitch direction and roll direction, and the attitude control capability is 0° for 5s, 15° / 25s, 30° / 35s, and 45° for 5s.

[0115] The geographic latitude and longitude information of the target is shown in Table 1, and the longitude and latitude of the four vertices of each target correspond one by one in order.

[0116] Table 1 Target geographic longitude and latitude

[0117]

[0118]

[0119] The steps of the method of choosing tasks through the look-ahead are as follows:

[0120] (1) Task area strip division

[0121] According to the camera width, the longitude and latitude of the mission area, and the satellit...

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Abstract

The invention discloses a method for choosing tasks by foresight. The method comprises the following steps of: (1) dividing a task area into strips according to the width of a camera; (2) calculating visible time intervals of a satellite on all strips according to the maximum pitching angle and maximum rolling angle of the satellite, sequencing according to starting moments of visible time windows to obtain a task sequence; (3) calculating the observation duration of each task strip in the task sequence by using a secant method; (4) according to satellite attitude maneuver time between the current task and the last scheduled task, judging whether the current task conflicts with the last scheduled task, wherein if the current task conflicts with the last scheduled task, the current task cannot be scheduled, and if the current task does not conflict with the last scheduled task, the next step is executed; (5) acquiring a foresight task group of the current task, and judging whether the current task conflicts with tasks in the foresight task group, wherein if the current task does not conflict with the tasks in the foresight task group, the current task can be scheduled, and if the current task conflicts with the tasks in the foresight task group, the current task is chosen; and (6) outputting a foresight result of the current task.

Description

technical field [0001] The invention belongs to the field of satellite task planning and scheduling, and relates to a method for selecting tasks in the process of satellite task scheduling. Background technique [0002] Rapid attitude maneuvering imaging satellites can realize a variety of complex imaging modes with the help of rapid attitude maneuvering capabilities. Compared with traditional earth observation satellites that use sub-satellite point imaging, the rapid attitude maneuver capability greatly increases the satellite's observation opportunities for targets, and thus has stronger observation capabilities. Each imaging mode of the rapid attitude maneuvering imaging satellite is accompanied by multiple operations such as attitude maneuvering, camera switching on and off, and these operations form a coherent control command sequence. Due to the large number of instructions, the reliability of instruction arrangement and annotation and the real-time execution of inst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/46
Inventor 王抒雁杨芳谢松刘胜利霍德聪
Owner AEROSPACE DONGFANGHONG SATELLITE
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