A dynamic calibration device and calibration method for a star sensor

A star sensor, dynamic calibration technology, applied in the field of aerospace measurement, can solve the problem of inability to evaluate the attitude output accuracy, and achieve the effects of high real-time synchronization accuracy, easy implementation and good versatility

Inactive Publication Date: 2012-01-04
BEIHANG UNIV
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Problems solved by technology

The static calibration method can obtain the internal parameters of the star sensor, but cannot evaluate the attitude output accuracy of the star sensor in the state of motion

Method used

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  • A dynamic calibration device and calibration method for a star sensor
  • A dynamic calibration device and calibration method for a star sensor
  • A dynamic calibration device and calibration method for a star sensor

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Embodiment Construction

[0030] The present invention will be described in further detail below. The present invention is realized on the basis of the static calibration system by using the technology of "reflection memory real-time network". The reflective memory network forms a real-time test system to synchronize the angle data of the turntable rotation and the star point position data from the star sensor. Reflective memory real-time network is a real-time, memory-based network system, all its work is done by hardware, without software overhead, coupled with the use of optical fiber transmission media, so the data transmission rate of tens of megabytes and Data transfer latency of hundreds of nanoseconds. Reflective memory products have the advantages of high bandwidth, low latency and low cost, so they are widely used in various real-time test and control systems. The working principle of the reflective memory real-time network is to insert a reflective memory card into each node that needs rea...

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Abstract

The invention belongs to aerospace measurement technology, and relates to a star sensor dynamic calibration device and a calibration method. The device of the present invention includes a single star simulator 1, a star sensor 3, a two-dimensional high-precision turntable 4, a data processing computer 5, a platform base 6 and a turntable control lower computer 9, and is characterized in that the data processing computer 5 is inserted with The reflective memory card A7 is inserted with the reflective memory card B8 on the lower computer 9 controlled by the turntable, and the two reflective memory cards A and B are connected by optical fibers to form a reflective memory real-time network. The calibration steps of the dynamic calibration method of the present invention are: static calibration; dynamic data collection; dynamic data processing. The system of the invention is simple in structure, easy to realize and low in cost; the real-time synchronization precision of data collection is relatively high; and the universality is good.

Description

technical field [0001] The invention belongs to aerospace measurement technology, and relates to a star sensor dynamic calibration device and a calibration method. Background technique [0002] The star sensor is an aerospace measurement instrument that uses star observation to provide high-precision attitude information for spacecraft. Its working principle is: the front-end camera unit of the star sensor uses the CCD (or CMOS) image sensor to capture the star map image, and obtains the barycenter coordinates and brightness information of the star image point through the image processing program, and then the star map recognition program uses these information in the Find the corresponding star in the navigation star library, and finally calculate the three-axis attitude of the star sensor. Before the star sensor is put into use, its internal parameters such as principal point, focal length and distortion coefficient must be accurately measured, which is called star sensor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02B64G1/36G01C25/00
Inventor 张广军魏新国
Owner BEIHANG UNIV
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