Asynchronous multi-frame star image fusion method for star sensor
A technology of star sensor and fusion method, which is applied in the field of astronomical navigation, can solve the problems of working speed and power consumption loss, weight and volume increase, etc., and achieve the effects of improved attitude measurement accuracy, low equipment and production costs, and good measurement results
Active Publication Date: 2019-06-18
BEIJING INST OF CONTROL ENG
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However, the hardware cost of the multi-probe star sensor is also very obvious, not only the increase in weight and volume, but also the loss of working speed and power consumption
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[0018] The following is a specific example of the present invention, but the method of the present invention is not limited to this example.
[0019] Such as figure 1 As shown, the method proposed by the present invention is implemented on a high-precision APS star sensor through the design of system timing and workflow. The system timing of traditional star sensors adopts fixed or adaptive single-frame exposure mode and single-frame For the recognition method, the system timing of the present invention is designed as a) an adaptive single-frame exposure method that periodically changes settings, and b) a recognition method that accumulates multiple frames and performs information fusion.
[0020] An asynchronous multi-frame star map fusion method of a star sensor, comprising the steps of:
[0021] Step 1. Periodically change the exposure time of the star sensor. The changing range is determined according to the number of star points extracted from the star map. The range sho...
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The invention provides an asynchronous multiframe star atlas fusion method of a star sensor. The method comprises the following steps: (1) exposure time of an image sensor of the star sensor is dynamically and periodically adjusted, in order to consecutively record star atlas data acquired by the star sensor in a period of time; (2) star point information in the acquired star atlas is extracted, positioning precision of all star points is determined, and star points with low positioning precision are removed; (3) relative displacement between star points in star atlas at different time is determined; (4) according to positioning precision of star points with higher positioning precision extracted in the step 2, and relative displacement obtained in the step 3, the information is converted to a star atlas directional coordinate system with the newest frame, and mean value of the same star point data in different star atlases with positioning precision as weight is taken; (5) in the star atlas directional coordinate system of the newest frame, an attitude determination algorithm is used, and high precision attitude measurement based on asynchronous multiframe star atlas fusion is completed. The measurement accuracy of the single probe star sensor is improved.
Description
technical field [0001] The invention relates to a star map fusion method of a star sensor, belonging to the technical field of celestial navigation. Background technique [0002] The star sensor is an imaging sensor for high-precision attitude measurement. It samples and takes pictures of the star background, and then extracts and recognizes the imaging results to measure the attitude of its optical axis in the inertial coordinate system. With the development of technology, the measurement accuracy of star sensors has been continuously improved, and the foreign advanced level has reached the sub-arc second level. At present, the method of improving the measurement accuracy of the star sensor is mainly considered from the hardware point of view: a) to improve the field of view, focal length and other indicators of the optical system; Improve the thermal stability of the structure. In terms of software and algorithms, the development of star sensors is relatively slow, and ...
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IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 朱建峰郑然程会艳武延鹏王艳宝张腾飞陈超
Owner BEIJING INST OF CONTROL ENG