Method for improving data updating rate of star sensor by using parallel streamline mechanism

A technology of star sensor and data update, which is applied in the space field to achieve the effect of increasing data update rate, good system realizability, and improving dynamic performance

Inactive Publication Date: 2011-07-06
HARBIN INST OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

For most image sensors, the star map storage time is generally shorter than its integration time, so the integration time will become a bottleneck for further improving the star sensor data update rate in the future

Method used

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  • Method for improving data updating rate of star sensor by using parallel streamline mechanism
  • Method for improving data updating rate of star sensor by using parallel streamline mechanism
  • Method for improving data updating rate of star sensor by using parallel streamline mechanism

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Embodiment 1

[0022] Example 1: Combining Figure 3-Figure 6 , a method for improving the data update rate of the star sensor by using a parallel pipeline mechanism in the present invention is characterized in that: the star sensor adopts a pipeline structure working mode, and the star sensor uses the image exposure part, the image storage part, the star image extraction time, the star sensor Figure recognition time, attitude calculation part, and attitude data communication output part are processed in parallel, and the data update time of the star sensor whole machine is the time taken by the slowest stage in the pipeline structure, that is, T is: T=max{T i ,T r +T p +T c}

[0023] The implementation method of the first working mode of the pipeline structure of the star sensor is: immediately start the exposure of the next frame image at the end of the data processing of the current frame image, store the current frame image, extract the star image coordinates from the current frame im...

Embodiment 2

[0025] Example 2: Combining Figure 7-Figure 9, the main performance index of the present invention:

[0026] First: test cycle and update rate

[0027] We choose a certain type of satellite star sensor for testing. The time parameters of the star sensor are as follows: integration time (T i ) is 125 milliseconds; image storage time (T r ) is 118ms; star image extraction time and star image recognition time and attitude calculation time T p It is about 78 milliseconds, the data communication baud rate is 115.2kbps, and the star sensor sends 22 bytes of data to the navigation computer every cycle, so the attitude data communication output time T c about 2 milliseconds. The data processing time T of processing a frame of image in serial mode is the sum of all processing times (that is, the cycle of the star sensor, unit: millisecond):

[0028] T=T i +T r +T p +T c =125+118+78+2=323

[0029] The data processing time T of processing a frame of image in parallel mode 1 i...

Embodiment 3

[0040] Example 3: Binding Figure 10 , the star sensor system includes the following main processes: exposure process, image storage process, star image extraction and star map recognition, attitude calculation process, and attitude data communication output process. The working process of the star sensor is: first take a star map, then save the shot star map to the memory, and then the star sensor processor reads the star map from the memory, extracts the corresponding star image coordinates from the star map, According to the stellar catalog, use the star map recognition algorithm to identify the coordinates of these star images, and use the attitude calculation algorithm to calculate the attitude of the star sensor in the inertial space, and finally transmit the attitude to the navigation computer through the data interface. Since these processes have neither feedback nor iterative operations, these processes can be performed in parallel. In the process of taking star maps...

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Abstract

The invention provides a method for improving the data updating rate of a star sensor by using a parallel streamline mechanism. The method comprises the following steps of: immediately starting exposure for the next frame image after the data processing of the current frame image is over, storing the current frame image, extracting star image coordinates from the current frame image, recognizing the extracted star image, calculating the altitude of the current frame and simultaneously carrying out a process for sending a recognizing result to a navigation computer and the exposure of the next frame image. The method improves the data updating rate of the star sensor and has low hardware cost and good system realizability. The data updating rate of the star sensor cannot be reduced when integration time, image memory time, star image extraction time, star map recognizing time and altitude calculating time or altitude data communication output time are increased on account of system application demands. The data updating rate of the star sensor is improved under the condition that the data accuracy of the star sensor cannot be reduced. As the data updating rate of the star sensor is improved, the dynamic property of the star sensor is further improved.

Description

(1) Technical field [0001] The invention relates to space technology, specifically a method for improving the data update rate of a star sensor by utilizing a parallel assembly line mechanism. (2) Background technology [0002] The star sensor is a high-precision attitude-sensitive measuring instrument. It determines the attitude of the satellite by detecting stars in different positions on the celestial sphere, and provides the three-axis attitude of the aircraft relative to the inertial coordinate system. Its working principle is: the optical system images the star on the photosensitive surface of the image sensor CCD (or APS), and the photoelectric conversion is realized by the CCD (or APS), and the output analog signal is converted by A / D and the star map is saved in the memory. , the data processing unit reads the star map from the memory, extracts the star image, recognizes the star map and calculates the attitude, determines the three-axis attitude of the star sensor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/38
Inventor 李葆华陈希军奚伯齐钟红军
Owner HARBIN INST OF TECH
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