A high-precision earth sensor with three separated FOVs for aircraft application

Hongjian Wang; Fei Xing; Peirong Fan; Chong Wang; Zheng You

doi:10.1117/12.2034608

21 August 2013 A high-precision earth sensor with three separated FOVs for aircraft application

Hongjian Wang, Fei Xing, Peirong Fan, Chong Wang, Zheng You

Proceedings Volume 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications; 89081V (2013) https://doi.org/10.1117/12.2034608
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The earth sensors are currently used in spacecrafts. Most of them with a single field of view (FOV) for earth observation are not applied to aircrafts in the atmosphere. For the use of the aircraft at 70 ~ 100km in the atmosphere, this paper proposes a separate triple-FOV earth sensor based on infrared detectors. By sensing the earth-horizon, the triple-FOV earth sensor obtains the geocentric vector, and calculates the altitude of the aircraft at the same time. The earth sensor uses three pieces of infrared detectors at 14 ~ 16μm. To sense the infrared light could ensure that the earth sensor does the same operation at night and day regardless of the weather and the light impact of the sun and the moon. The optical axes of the three fields of view are positioned at 120° from each other in the horizontal plane, and the angle between the optical axes and the vertical direction is 82.86°. Considering the model of the surface of the earth’s atmosphere, the earth's radius and so on, the mathematical model of the triple-FOV earth sensor is established. From 70km to 100km, the result of simulation shows that the altitude measurement accuracy is better than 100m and the angle measurement error is 3.8". The earth sensor can provide high-precision position information, and make data fusion with additional sensors to achieve autonomous navigation of aircrafts.

Citation Download Citation

Hongjian Wang, Fei Xing, Peirong Fan, Chong Wang, and Zheng You "A high-precision earth sensor with three separated FOVs for aircraft application", Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 89081V (21 August 2013); https://doi.org/10.1117/12.2034608

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KEYWORDS

Sensors

Infrared sensors

Infrared radiation

Earth's atmosphere

Infrared detectors

Atmospheric sensing

Mathematical modeling

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