Analytic method for space debris material based on non-negative matrix factorization

Abstract

An analytic method for a space debris material based on non-negative matrix factorization is disclosed. The analytic method comprises the following steps: step 1, collecting debris spectroscopic data; step 2, pre-processing the debris spectroscopic data; (2.1), cutting off high-noise wave sections at two ends of spectrum; (2.2), thresholding; (2.3) removing exceptional points; step 3, non-negative matrix factorization: giving non-negative matrix V, finding non-negative matrix factors W and H, enabling V to be approximately equal to WH; for evaluating approximation performance, providing a cost function and corresponding iteration updating rules of the cost function, calculating generalized K_L degree of dispersion; step 4, recognizing debris material spectrum; by selecting different initialized W and H values to obtain candidates of the debris material spectrum, by using known ground material spectrum, calculating generalized K_L degree of dispersion of the candidate material spectrum and ground material spectrum by step 4, selecting threshold value D0 of the degree of dispersion, and finally determining the candidate spectrum less than the threshold value of the degree of dispersion as the composition of the debris material spectrum. The analytic method is effectively suitable for deep space environment and higher in accuracy.

Description

technical field [0001] The invention relates to the technical field of space monitoring implemented by manned spaceflight, in particular to a space debris material analysis method. Background technique [0002] Since the former Soviet Union launched the first artificial earth satellite in October 1957, decades of human space exploration activities have produced a large number of space debris, which poses a serious threat to the safety of human spaceflight activities and has become the main source of pollution of the space environment. To a certain extent, it has affected the normal development of space activities. [0003] With China's economic development and national security needs, there will be more and more space activities, and in the near future, the demand for satellite applications is likely to increase significantly. These application satellites are closely related to the national economy. Once damaged, the social and economic impacts will be huge, and even nation...

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Problems solved by technology

[0010] In order to overcome the shortcomings of existing space debris material analysis methods that cannot be applied to deep space environments and have poor accuracy, the present invention provides a space debris material based on non-negative matrix decomposition that is effectively applicable to deep space environments and has better accuracy. Analytical method

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