Terahertz telescope observation task arrangement method based on genetic algorithm

Abstract

The invention discloses a terahertz telescope observation task arrangement method based on a genetic algorithm, which combines specific constraint conditions of observation task arrangement of a space terahertz telescope, and innovates in the aspects of chromosome coding, population individual construction and fitness function definition. The method mainly comprises seven functional parts: discretization of observation arrangement time, construction of arrangement chromosomes, calculation of a fitness function, construction of parents, cross mutation inheritance, offspring screening and acquisition of a final optimized arrangement individual. The method comprises the following steps: constructing population individuals corresponding to a legal arrangement scheme by quantifying constraint conditions that terahertz target sources can be observed, taking observation completion degrees of all target sources as fitness function values of the individuals, performing quantification, screening parents of offspring heredity by adopting a Roulette Wheel selection method, and selecting the offspring heredity by adopting a Roulette Wheel selection method. And the genetic algebra and population quantity required by the arrangement optimization problem are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of astronomical observation, in particular to a method for arranging observation tasks of a terahertz telescope based on a genetic algorithm. Background technique [0002] The terahertz band range refers to 0.1-10THz. There are abundant molecular rotation spectral lines and atomic fine structure spectral lines in this band. Astronomical observations in the terahertz band are an effective means to study astrophysical directions such as galaxy and star formation. However, limited Due to the influence of water vapor in the atmosphere, part of the spectral line information is absorbed by the atmosphere, so space is an inevitable site for some terahertz band observations. [0003] The China Space Survey Telescope (CSST) is China's flagship space astronomy project and is expected to be launched around 2024. CSST is the largest space telescope developed by my country, with outstanding features such as large field ...

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Problems solved by technology

[0004] Compared with ground-based telescopes, space terahertz telescopes will face many constraints when conducting scientific mission observations: 1. Changes in the orbit of the space telescope will cause the observation target to be blocked by the earth, making the observation target unobservable; 2. The orbit of the space telescope The change of the telescope will cause the angle between the receiving antenna of the telescope and the sun and the moon to change constantly. When the angle between the receiving antenna of the telescope and the sun and the moon is too small, the telescope detector module will be affected by the violent interference signals from the sun and the moon. 3. Changes in the orbit of the space station cause the sub-satellite point of the terahertz module to move on the surface of the earth. When the sub-satellite point falls on the South Atlantic Anomaly (SAA), the entire space station will All equipment will be affected by strong geomagnetic interference. In order to protect the equipment on the space station, all observation equipment on the space station will suspend observation in this case; 4. The energy provided by the solar flap on the space station is changing. It is limited, and it is impossible to observe all the observation modules carried at the same time; 5. The total amount of heat dissipation on the space station is limited, and the operating temperature of the control moment gyroscope has strict constraints on the number of maneuvers allowed within one orbit , which will limit the total amount of change in the antenna pointing angle when the telescope is making observations during the orbit

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