Mr. Zhenfei Song Profile

Zhenfei Song

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Proceedings Article | 18 December 2019 Paper

One method on refraction star-map simulation

Zhenfei Song, Chen Zhao, Lixin Ren

Proceedings Volume 11338, 113380A (2019) https://doi.org/10.1117/12.2540973

KEYWORDS: Refraction, Earth's atmosphere, Star sensors, Space operations, Stratosphere, Atmospheric modeling, Atmospheric sensing, Stars, Navigation systems, Mathematical modeling

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High precision star sensor can indirectly gain the information of attitude and orbit by refracted starlight, so that spacecraft can navigate and position autonomously. Due to the high cost of spacecraft launch and development, the functional validation of this technology relies mainly on the ground simulation tests and experiments. At present, less attention is paid to the study on refraction star-map simulation method, and the simulation effects of the existing implementation methods are difficult to meet the engineering requirements. Firstly，by combing the autonomous navigation principle and mathematical model of starlight atmospheric refraction, based on the situation that effective starlight refraction occurs in stratosphere space, a mapping band of refracted starlight is put forward. Then, through three steps including the critical condition of starlight refraction happens in the stratosphere space, the determination method of refracted starlight vector and the angle range of star sensor boresight pointing when the refraction stratosphere space enters the field of view (FOV), a method on refraction star-map simulation proposed in this paper is described in detail. Finally, with the help of MATALB, the refraction star-map simulation is achieved and a sharp contrast of the mapping coordinates of starlight vectors with/without refraction is given, and the effect of simulated star-map is excellent. This method has important engineering application value.

Proceedings Article | 8 October 2015 Paper

Simulating method study on stray light noise out of sunlight baffle of star tracker

Haiyong Wang, Zhenfei Song, Jingjin Li, Ershuai Xu, Tianmu Qin

Proceedings Volume 9675, 96750N (2015) https://doi.org/10.1117/12.2197819

KEYWORDS: Sun, Stars, Stray light, Computer simulations, Data modeling, Mathematical modeling, Performance modeling, Star sensors, Detection and tracking algorithms, Space operations

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A frame of simulated star map needs to superimpose various types of background noise on it, among which the omissive refractive stray sunlight out of the sun baffle is one of the most important noise sources. For the real time simulation of star maps, the optimal scheme should be that sun stray light noise generation relies on mathematical model rather than the pre-generated noise frame base to be loaded. Firstly the formation mechanism of sun stray light noise out of star tracker baffle is introduced and its modeling method is given, the sun directional vector at the imaging time is converted to the unit vector coordinates in the star tracker body frame through a series of attitude transfer matrix, and continue to be projected on the extended imaging plane via the optics model, gray value of each pixel is assigned based on the distance between the sun projection point and the corresponding pixel. Then, based on a set of sun simulator experimental imaging data in different angles for the performance test of a certain baffle, the model coefficients are estimated through fitting method. Finally, the item of sun stray light noise simulated this way is superimposed on the basic pure simulated star map, so the similarity of the final outputted star map is further promoted in the electronic star simulator used in a certain institution. The scenarios simulated by this method, which depict the circumstance that the boresight of the star tracker is adjacent to sun vector, are convenient tools for the robustness test of star image centroiding algorithm or on-orbit real time flight simulation involving star light attitude determination.

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