Double-refraction sun sensor and measurement method of carrier three-axis attitudes of double-refraction sun sensor

Abstract

The invention discloses a double-refraction sun sensor. The double-refraction sun sensor comprises a light filtering module, a single-axis crystal camera lens, an image sensor and a data processing module, and is characterized in that the light filtering module is used for bundling light to form relatively fine incident light; the single-axis crystal camera lens is used for carrying out double refraction on the incident light to form two beams of refraction light; the image sensor is used for imaging the two beams of refraction light; the data processing module is used for extracting an image point center, calculating vector information of the incident light according to the two beams of refraction light and calculating three-axis attitude information of a carrier. When the carrier is equipped with the double-refraction sun sensor, the invention further discloses a measurement method of carrier three-axis attitudes; three-axis attitude measurement can be realized by utilizing a spacecraft / unmanned aerial vehicle through independent sun measurement. The double-refraction sun sensor disclosed by the invention can realize a relatively large view field and can guarantees that attitude measurement precision is not lost.

Description

technical field [0001] The invention belongs to the field of attitude measurement and determination, in particular to a method for measuring the three-axis attitude of a birefringent sun sensor and its carrier. Background technique [0002] The sun sensor is an important measurement component in the aerospace attitude control system. It is the most widely used photoelectric sensor in the aerospace field. It can provide angle feedback between the sun vector and a specific axis on the spacecraft. Almost all spacecraft need to be equipped with sun sensors in order to complete the attitude control tasks of the spacecraft at various stages according to the state feedback information provided by the sun sensors. [0003] The conventional sun sensor uses the principle of pinhole imaging to realize the measurement of the sun vector. There is only one ray, and it can only measure the attitude information in the direction of the two perpendicular sensor optical axes, and cannot measur...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the current solar sensor cannot measure the attitude information of the carrier around the optical axis of the sensor, and proposes a birefringent solar sensor, which utilizes the birefringence of a uniaxial crystal Based on the principle, the three-axis attitude measurement of the carrier can be realized by observing the sun alone, and high-precision attitude measurement can be achieved under the condition of ensuring a large field of view, so that the spacecraft / UAV can be realized by relying on the sun measurement alone Three-axis attitude measurement

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