An anti-jamming method for analog sun sensors based on earth albedo

Abstract

The invention provides an anti-jamming method for analog sun sensors based on the earth albedo, which belongs to the field of anti-jamming sensors. The invention establishes the earth albedo model, calculates the irradiance received by the sun sensor, and obtains the irradiance Statistical characteristics of illuminance, by obtaining the discriminant function of sunlight and earth reflection, it can be used as the anti-interference basis for the sun sensor to the earth reflection, and the distinction between sunlight and earth reflection can be carried out. Aiming at the anti-interference problem of the sun sensor based on the earth albedo, the present invention not only analyzes the relationship between the irradiance and the incident angle in the case of the earth albedo, but also designs a linear classifier to determine the linear discrimination between the sunlight and the earth albedo The function can make full use of the measurement information to improve the correct rate of anti-interference. The analysis results of the present invention show that the anti-interference method is reasonable, and can provide a reference for the correct use of the measurement of the sun sensor.

Description

technical field [0001] The invention relates to the field of sensor anti-interference, in particular to an anti-interference method for a sun sensor, which prevents the earth reflection light from being misjudged as sunlight. Background technique [0002] In the Attitude Determination and Control System (ADCS) of microsatellites, the sun sensor is the main attitude measurement component. During use, it is unavoidably interfered by the earth's reflection light, which may be mistaken for sunlight for calculation, resulting in attitude determination. The wrong input of the system leads to deviations in the pointing of solar panels, communication antennas and other components on the star, which affects the mission execution of the satellite and even poses a threat to its survival. Therefore, in order to use the sun sensor for attitude determination, it is necessary to enhance its anti-interference ability to the earth reflection light, eliminate or reduce the influence of the ea...

AI Technical Summary

Problems solved by technology

Analysis of the influence of the earth albedo on the star sensor[J]. Laser and Infrared, 2012.9,42(9):1011-1015), reduce the spectral range of the receiving section or reduce the irradiance entering the sensor, and eliminate the stray light spectrum Energy, this method can effectively reduce the influence of stray light, but it will increase the mechanical complexity of the solar sensor and increase the cost of the device

[0005] But there are few research contents on the software level (Han Ke, Jin Zhonghe, Wang Hao. Optimal attitude determination algorithm for pico-satellite based on solar panels[J]. Solar Energy Sinica, 2010, 44(9): 1719-1723; Wang Enhong, Hu Yihua, Liu Wei. Research on anti-jamming characteristics of digital solar attitude sensor [J]. Infrared Technology, 2007.4, 29(4): 218-221), mainly through simulation analysis, and obtain the fixed threshold value of current according to the statistical results. Reduce the ratio of the incident earth reflection light to the brightness of the sun, but due to the uncertainty of the ratio of incident light, the fixed threshold does not have enough adaptability. If the current threshold is too small, when the incidence angle of the earth reflection light decreases, the received The reflection of the earth will increase, which may cause the current generated by the reflection of the earth to exceed the threshold. At the same time, if the current threshold is too large, the over-design will reduce the number of times the sensor is used, and reduce the speed and accuracy of attitude determination. Therefore, the fixed threshold method The anti-interference of the earth's reflected light cannot be fully effective

[0006] Although the existing methods have carried out basic anti-jamming research on the earth albedo, they only consider from the perspective of a single current or field of view, and the threshold is limited to a fixed value, which cannot adapt to the situation of the earth albedo under different incident angles.

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