A method for image simulation of space astronomical cosmic ray observation

Abstract

The invention discloses a method for simulating a space astronomy cosmic ray observation image. The method comprises a first step of choosing existing space telescope images according to the characters of a space astronomy observation instrument which needs simulating, a second step of grouping the space telescope images according to different orbital positions in the process of observing, wherein each group of images are processed by the following steps, firstly, all cosmic ray events in the images are extracted to establish cosmic ray event template libraries, and secondly, the statistic analysis is carried out on the cosmic ray event template libraries established for each group of images, the statistic process is carried out on the quantity of encountered events on a CCD target face in unit picture element area and in unit time, the quantity of the encountered events is recorded as the cosmic ray encounter rate CRsRate, and the statistic process is carried out on the energy distribution of the cosmic ray events and the number of picture elements occupied by each cosmic ray event, a third step of extracting the cosmic ray events from the cosmic ray event template libraries according to the information of images to be simulated, a fourth step of generating simulation cosmic ray images through the extracted cosmic ray events in the third step, the remaining picture elements, except the cosmic ray events, in the images serve as the background, and the value of the remaining picture elements is set to be zero.

Description

technical field [0001] The invention relates to a simulation method for space astronomical cosmic ray observation image, which is suitable for simulating the observation image (effect) of cosmic ray in the observed CCD image in space astronomical observation (mainly refers to the optical band), and can more realistically simulate cosmic ray Basic parameters such as energy distribution and shape structure. Provide powerful simulation data support for space astronomical observation projects under development, to truly and effectively analyze the interference and impact of cosmic rays on the observed celestial objects, and reasonably evaluate the feasibility of realizing scientific object observations. Background technique [0002] Cosmic rays will have a serious interference noise effect on the CCD (Charge Coupled Device: Charge Coupled Device image sensor), the camera terminal equipment for astronomical observation. Randomly distributed and differently shaped noise points wil...

AI Technical Summary

Problems solved by technology

[0004] The existing cosmic ray image simulation method on CCD uses a relatively simple model, such as the popular IRAF software package mknoise in astronomy, which mainly uses the elliptical semi-major axis and semi-minor axis of Gaussian distribution to describe different cosmic ray shapes , which is very different from the cosmic rays in reality, especially the spot shape of cosmic rays on the CCD in space observation

In addition, the software package does not provide the calculation parameters and basis for the distribution of cosmic ray energy and the number of cosmic ray events. These parameters are all a free parameter in the software package, which has great artificial randomness, and it is difficult to truly simulate the universe. The observation image of the ray in the CCD makes it have the characteristics of the real cosmic ray event energy distribution and contour morphological structure

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