Rapid gate image processing system and method of star sensor

A technology of star sensor and wave gate image, which is applied in the field of star sensor, can solve the problems of lack of flexibility and achieve the effects of improving anti-stray light ability, improving measurement accuracy, improving weak star extraction ability and star point utilization rate

Active Publication Date: 2017-12-22
SHANGHAI AEROSPACE CONTROL TECH INST
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However, regardless of the position of the star point in this method, the position of

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  • Rapid gate image processing system and method of star sensor
  • Rapid gate image processing system and method of star sensor
  • Rapid gate image processing system and method of star sensor

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[0033] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Take the star sensor detector area with 1024×1024 pixels as an example. The size of the wave gate is 8×8 pixels, and the detector array is divided into 16384 wave gates. Each star map can process and store up to 32 star points. Each star point needs to collect up to 4 wave gate data according to the coordinate position, and at least 1 or 2 wave gate data. FPGA reserves a storage space for each star point that can collect 4 wave gate data, that is, 1024×16bit (pixel gray value is 12bit).

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Abstract

The invention provides a rapid gate image processing system of a star sensor. The rapid gate image processing system comprises a CPU and an FPGA. The FPGA includes a gate control memory, a gate collection module, a gate data memory, a pixel cluster head pixel address memory, and a pixel cluster processing module. According to the invention, a gate image processing method using a navigation star as a mass center to extract a pixel cluster center is put forward for the first time in the domestic star sensor field; and thus with the assistance of the CPU, only the FPGA completes gate data acquisition, pixel cluster background estimation, and start point feature amount calculation. The background in a pixel cluster is evaluated by using grayscale values of all pixels in the pixel cluster and thus a grayscale mean value of all pixels in the pixel cluster is calculated, so that the measurement precision of the star sensor is improved. On the basis of the parallel processing advantages of the FPGA, a plurality of pixel clusters are processed synchronously and the mass centers of star points of all pixel clusters are extracted simultaneously.

Description

technical field [0001] The invention relates to a star sensor, in particular to a star sensor fast wave gate image processing system and method. Background technique [0002] The star sensor is a high-precision spacecraft attitude measurement instrument, which is mainly used for three-axis attitude measurement and spacecraft navigation of the spacecraft. Its accuracy plays an important role in the attitude measurement, control and reliability of the spacecraft. [0003] The accuracy of the star sensor is closely related to the number and quality of star points used to determine the attitude. The number refers to the number of effective stars for determining the attitude, and the quality refers to the positioning accuracy of a single star. The increase in the number of stars for determining the attitude is beneficial to reduce the noise equivalent angle (Noise Equivalent Angular, NEA), NEA reflects the ability of the star sensor to regenerate the corresponding attitude by a c...

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Application Information

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IPC IPC(8): G06T1/20G06T7/66G01C21/02
CPCG06T1/20G06T7/66G01C21/02G06T2200/28G06T2207/20021G01C21/025G01C21/24G01S3/7867G01S3/784G06T1/60
Inventor 周琦毛晓楠马英超余路伟郑循江周宇孙少勇闫晓军胡雄超
Owner SHANGHAI AEROSPACE CONTROL TECH INST
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