Combined defining method for carrier attitude of double-star sensor

Abstract

The invention relates to a combined defining method for the carrier attitude of a double-star sensor, and belongs to the field of celestial navigation. The method comprises the following steps: firstly, in an astronomical refraction correction method based on the star reference vectors for a star sensor, realizing the correction of astronomical refraction by amending the star reference vectors; secondly, in a ship body attitude determination method based on the star observation vectors of a combined double-star sensor, combining the observation vectors of each recognizable star of the double-star sensor in two fields into an observation vector matrix, and finally completing ship body attitude resolving with a corresponding star reference vector matrix. On the basis of simplifying the astronomical refraction correcting algorithm of the star sensor, the capability of obtaining the ship body attitude of the double-star sensor is improved at the same time. The main contents refer to the two aspects of the astronomical refraction correction method based on the star reference vectors and the ship body attitude determination method based on the star observation vectors of the combined double-star sensor.

Description

technical field [0001] The invention relates to a method for jointly determining the attitude of a ship hull by double-star sensors. It belongs to the field of celestial navigation. Background technique [0002] The star sensor takes the star as a reference object, and the detection unit captures the star map of the sky at a certain moment, and the data processing unit performs a series of processes such as star centroid extraction, star map recognition, star tracking, attitude calculation, etc., and finally It is a high-precision attitude measurement device to obtain high-precision attitude information of the star sensor relative to the inertial space. At present, star sensors are widely used in aerospace vehicle attitude measurement. With the maturity of high-precision and large-field star sensor technology, star sensors have been able to complete hull attitude measurement. In order to improve the accuracy of hull attitude measurement, the star sensor usually adopts the ...

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Problems solved by technology

[0004] Regarding the joint attitude determination method, the general method requires first to obtain the boresight orientations of the two star sensors relative to the reference coordinate system, and then calculate the attitude angle of the hull relative to the reference coordinate system according to the installation matrix of the star sensor. Only when the sensor recognizes more than 4 stars can the boresight pointing be obtained. When the two star sensors cannot give the precise pointing of their respective boresight relative to the reference coordinate system at the same time, the double star sensor cannot obtain the attitude of the hull

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